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Analysis of inclined length effect of roof fracture and overlying strata catastrophe in steeply inclined longwall face: A case study Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-19 Yu Xiong, Dezhong Kong, Gaofeng Song
In order to determine the optimal inclined length of steeply inclined working face, the fracture field, strain field, displacement field and strata movement trend of steeply inclined working face were monitored through physical simulation test and digital speckle technique. At the same time, combined with theoretical analysis, the movement law of overlying strata and the catastrophe mechanism of working
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Research on dynamic characteristics of railway side-cracked slab for train-track coupled system Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-19 Long Chen, Yao Wang, Zhenxing He, Zhihao Zhai, Yanbo Bai
The Ballastless track have been extensively implemented in high-speed railways. However, during the long-term operational process, degradation, such as side crack or defect phenomena produced on the slab inevitably, poses a threat to the stability and the durability of the track structure. Consequently, it is imperative to propose a dynamic approach that can effectively predict the impact of side-cracked
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Effect of electrochemical hydrogen-charging conditions on nanomechanical properties of X80 pipeline steel Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-19 Qing Hu, Y. Frank Cheng
In this work, nanoindentation tests, combined with hydrogen (H)-permeation testing, were used to study the effect of electrochemical H-charging conditions on H-permeating parameters and nanomechanical properties of X80 pipeline steel. The steady-state H-permeating current density, H-permeating flux, and the H subsurface concentration obtained in 0.5 M HSO solution are apparently greater than the parameters
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Damage evolution and failure mechanism of masonry walls under in-plane cyclic loading Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-17 Jia-Liu Pan, Jia-Xu Shen, Zi-Lan Zhong, Yu Xia, Xiao-Dong Li, Yong-Qun Zhang
Masonry structures often exhibit poor seismic performance during earthquakes owing to their low material strength, structural integrity, and ductility. To address the mechanism of in-plane damage and collapse of masonry walls subjected to earthquake ground motion, three full-size brick walls, one with structural columns and two without structural columns, were designed and constructed in this experimental
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Cause of bending fracture in high-strength fasteners and heredity of surface recarburization in high carbon steel Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-16 Tao Zhang, Hu Long, Guoguang Cheng, Junyu Guo, Zhongyu Lei, Zhongzhong Xun
In this work, the cause of bending fracture in high-strength fasteners after electroplating was investigated and the heredity of surface recarburization from continuously cast high carbon steel blooms to the final fastener products was explored. The fracture surface of the fasteners displayed intergranular cracking and numerous intergranular facets accompanied by ductile tearing. Hydrogen-induced stepwise
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Post-fire mechanical properties and constitutive model of Q690 high-strength structural steel Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-15 Wenchao Li, Botao Ge, Zepeng Li, Guohua Xing, Yuan Jing
Fire hazard is one of the main threats to the integrity of steel structural buildings. Developing an accurate post-fire constitutive model for structural steel is crucial for enhancing the failure assessment of steel structures exposed to fire. In this study, the post-fire mechanical behavior of Q690 high-strength structural steel is investigated. Eighteen round bar specimens made of Q690 steel were
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Failure analysis on abnormal cracking of the main landing gear door of a civil aircraft Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-15 Tong-Hao Jiang, Zhen-Guo Yang
Among the myriad structural and moving components integral to civil aircraft, only a select few confront the dual challenges of meeting aerodynamic and mechanical performance criteria, a circumstance exemplified by landing gear doors. The failure of landing gear poses a substantial threat to both the structural integrity and the safety of an aircraft during flight. Surprisingly, the existing literature
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Fault detection in the gas turbine of the Kirkuk power plant: An anomaly detection approach using DLSTM-Autoencoder Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-15 Al-Tekreeti Watban Khalid Fahmi, Kazem Reza Kashyzadeh, Siamak Ghorbani
Developing a maintenance schedule for different parts of a power plant can help to prevent serious system damage while also having a direct effect on reducing maintenance time and costs. Moreover, the proposed procedure can provide a better understanding of the health state of the system. The occurrence of problems (anomalous behavior) in power plants usually takes time and happens gradually. Predicting
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Compaction elastoplastic damage constitutive model of rock under hydro-mechanical coupling: A heuristic modeling method based on internal state variables theory Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-14 Huiguan Chen, Cheng Zhao, Rui Zhang
Based on the internal state variables (ISV) theory, this paper employs a heuristic modeling approach to investigate the compaction elastoplastic damage constitutive model of rocks under hydro-mechanical coupling. The heuristic modeling method demonstrated herein can seamlessly integrate with existing constitutive theories, facilitating a broader spectrum of research on hydro-mechanical coupling constitutive
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Excessive vibrations experienced in a Kaplan turbine at speed no load Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-13 Greco Moraga, Vicent Mut, Jeferson Girardelo, Farid Mazzouji, David Valentín, Mònica Egusquiza, Eduard Egusquiza, Alexandre Presas
A Kaplan turbine unit from a new powerplant experienced high levels of vibrations and noise during the acceleration of the unit to nominal speed. These levels remained very high at speed no load. A first analysis seemed to indicate a possible blade resonance phenomenon as the highest vibrations were measured on the head cover. Nevertheless, after some modifications on the root of the blades, the vibrations
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Degradation of the welded joint microstructure of a 40-year-old pressure vessel made OF 16Mo3 steel Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-13 Michał Kawiak, Paweł Kochmański
The article concerns a pressure vessel operated for forty years at elevated temperature in in an ammonia production installation. During the planned control tests, unacceptable defects were detected in the circumferential welded joint of the vessel, using the ultrasonic method. In the repair process, a fragment containing a crack located in the heat-affected zone was cut out of the welded joint. The
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Damage analysis and safety control of surrounding rock around peripheral hole of diversion tunnel Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-13 Yumin Yang, Nan Jiang, Chuanbo Zhou, Xianzhong Meng, Bin Zhu, Zhongwei Cai
The control of overbreak in blasting excavation is a significant technical challenge and a subject of extensive research in the field of engineering. This study examines the damage characteristics of the surrounding rock in a tunnel section through blasting test and numerical simulation conducted as part of the San Gavan diversion tunnel project in Peru. The orthogonal test of peripheral holes under
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Study on mechanical properties and failure mechanism of hard rock with stiff discontinuities based on 3D printing Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-13 Hong Xu, Zhen Zhang, Jie Yan, Zhi-Peng Jiang, Lu-Shen Zhao, Yong-jie Zhang
To examine the influence of stiff discontinuities with different angles and roughness on the stability of deep hard rock engineering, RLSD is created through the integration of 3D scanning, digital modeling, and 3D printing. The specimen's composition truly reflects the mineral components of the original rock. The impact of angle and roughness on the strength, deformation, and failure characteristics
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Thermal corrosion fatigue crack growth behavior and life prediction of 304SS pipeline structures in high temperature pressurized water Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-13 Z.H. Li, Y.M. Han, Y.G. Zhao, S.L. Yang, Z.M. Zhong, Y.H. Lu
The influence of transient water temperature changes on the fatigue crack growth behavior of 304SS pipeline structures was studied based on high-throughput testing method through the modification of dual loop circulating water equipment. Results demonstrated that the fatigue crack growth rate gradually decreased with the decrease of cooling rate, and the crack growth rate was exponentially related
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Determination of critical energy for coal impact fracture under coupled static-dynamic loading Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-12 Shang Yang, Jianguo Ning, Xiulong Zhang, Jun Wang, Xinshuai Shi, Xinzheng Qu
Deep coal is constantly subjected to high static loading, and the accompanying mining disturbances will exacerbate the energy changes in the coal specimen. This study utilized the Split Hopkinson Pressure Bar (SHPB) system to examine the critical energy required for coal impact fracture under one-dimensional (1D) and three-dimensional (3D) coupled static-dynamic loading. The results revealed that a
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Failure of protection against particle invasion in hard/soft dynamic seal: Modeling and observation Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Ziyi Zhou, Qin Zhou, Kai Zhang, Tangshengjie Wei, Yunfei Di, Yuxuan Wang, Kun Qin
Particles invasion into sealing interface is difficult to avoid in downhole conditions, which directly induces the failure of FKM O-ring dynamic seals. To enhance the performance of hard/soft dynamic seals in particles environment, the work on particles invasion has been initiated. A displacement model for particles invasion was developed and tested. In-situ observations were used to investigate particles
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An investigation into post-derailment self-protection mechanisms for railway vehicles Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Huansheng Wang, Zhenxian Zhang, Kaiyun Wang, Wubin Cai, Xingwen Wu, Maoru Chi, Jianfeng Sun
With the rapid expansion of railway networks and increasing transportation demands, the operating safety of railway systems, especially the risk management and safety measures to prevent train derailments, has become critically important. This study investigates the post-derailment dynamic behavior of railway vehicles and its self-protection mechanism. In order to understand the post-derailment dynamic
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Investigation of hydrodynamic lubricant film breakdown between the journal and bearing in a high-speed coolant pump of electric vehicles Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Yandong Gu, Anlong Yang, Martin Böhle, Wenpeng Zhao
The high-speed coolant pump is essential for electric vehicle thermal management, ensuring optimal module temperatures. The pump impeller and bearing are combined into a rotor and then fit on a fixed shaft with a clearance, aiming to generate a complete lubricant film between the stationary journal and rotating bearing during pump operations. However, during the pump durability test under off-design
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Critical load determination for preventing rotational loosening in bolted joints under dynamic transverse loads Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Zhang Jingdong, Li Weihao, Feng Jiaming, Liao Ridong
To ensure the reliability of bolted joints, it is essential to accurately determine the critical load that prevents rotational loosening of the nuts. In this paper, the mechanical behavior of bolted joints during tightening, after tightening, and under transverse loading was analyzed. The contact status of two mating surfaces, including the thread and nut bearing surfaces, and their ability to withstand
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Multi-modal cascade detection of pipeline defects based on deep transfer metric learning Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Boxuan Gao, Hong Zhao, Xingyuan Miao
Pipeline defect detection technology plays an important role in pipeline maintenance and transportation. Defect detection based on machine learning methods has gained considerable attention in practical engineering. However, it is still challenging to provide an accurate diagnosis and defect size estimation due to the poor inter-class discriminability and intra-class concentration. Such as, it is difficult
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Analysis of the delayed cracking mechanism of an industrial hot-dip galvanized DP1180GI steel coil Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Weiguo Li, Yao Zhou, Qingjun Zhou, Jinxu Li
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Fracture characteristics and failure analysis of underground caverns in Longyou Grottoes induced by humidity change Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Tie Wang, Chengzeng Yan
The stability of underground caverns in Longyou Grottoes is greatly influenced by humidity change since they are mainly composed of argillaceous siltstone, which is highly sensitive to moisture. In this work, a coupled humidity diffusion-fracture model based on the finite-discrete element method (FDEM) is employed to study the fracture characteristics and failure mechanism of underground caverns No
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Failure analysis of buried pipelines under the action of oblique slip faults Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-11 Hongliang Wang, Ruixin Bao, Jia Li, Jianmin Ren, Wei Yan, Xiangguang Sun, Xiaoguang Song, Jian Zhu, Yong Chen, Zhongfei Yan, You Guo, Weirui Liu, Changfu Liu
Oil and gas are often transported by long-distance buried pipelines. When the pipeline is subjected to faulting, the pipeline is highly susceptible to failure under axial loading. However, there is a lack of understanding of the effect of inertial loads on pipeline failure in the analysis of influencing factors under the action of faults. Most of the current studies mainly use static or quasi-static
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Development of a numerical methodology for the analysis of the post-buckling and failure behavior of butt-joint stiffened thermoplastic composite panels Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-10 Harry Psihoyos, Konstantinos Fotopoulos, George Lampeas, Jan Waleson, Michel Brethouwer, Brendan Romano, Derrick Pearson
This paper presents the development of a finite element (FE) numerical modelling methodology for the post-buckling and failure analysis of butt-joint stiffened thermoplastic composite panels. The structural components of the investigated panels are bonded with co-consolidated butt-joint methods - a novel joining technique used in aerospace structures. Two panels are examined in this work: the first
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Hydrogen-assisted cracking and damage tolerance of high-strength lath-martensite steel bars for structural applications Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-09 Patricia Santos, Mihaela Iordachescu, Maricely De Abreu, Andrés Valiente
The paper addresses the hydrogen-assisted cracking and damage tolerance of high-strength lath martensite steel bars assessed from slow strain rate tensile tests. These were carried out on fatigue precracked specimens simultaneously charged with hydrogen in a standardized 20 % aqueous solution of ammonium thiocyanate at 50 °C and in air, at room temperature, for comparison. The fractographic analysis
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Research on mining-induced surface soil cracking mechanism and development depth of downward fracture Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-09 Jian Cao, Xumin Wei
In order to reveal the cracking mechanism of surface soil layer caused by coal seam mining, and explore theoretical methods for predicting the development depth of downward fractures during mining. Based on the background of the No. 1–2 upper coal seam mining in Daliuta Coal Mine, combining with fracture mechanics, soil mechanics, physical similarity simulation and numerical calculation methods. The
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Failure analysis and numerical drive structure optimization design of Cr12Mo1V1 electrical connection die Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-07 Zhiyong Yang, Jiangyuan Shen, Chunlai Yan, Tianyue Tang, Peizhen Li
A type of Cr12Mo1V1 electric connection die occured brittle fracture after 200 times of service, and its life was much lower than the design life of the die. In this paper, the 5M1E failure analysis method was adopted, combined with the characteristics of Cr12Mo1V1 cold-work die steel, scanning electron microscopy, direct reading spectrometer, Rockwell hardness tester, metallographic microscope and
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Study on stress distribution law of surrounding rock of roadway under the goaf and mechanism of pressure relief and impact reduction Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-07 Junwen Zhang, Yang Zhang, Yanbo Han, Wenbing Fan, Zhixiang Song, Huijun Yu, Junjie Zhang, Hanqiao Zhang, Jianxun Liu
To safely extract residual coal from a mine affected by rock bursts, the concept of “roadways under goafs” has been proposed as an effective layout. The pressure relief and shock reduction mechanism of roadways under goafs is elucidated through theoretical analysis, numerical simulation, and engineering verification. The stress model for goafs is established based on elastoplastic mechanics, followed
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Dynamic increase factors for progressive collapse analysis of steel structures considering column buckling Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-07 Luca Possidente, Fabio Freddi, Nicola Tondini
Progressive or disproportionate collapse of structures may have severe socio-economic consequences. Aiming at buildings that can withstand such events, one solution is to prevent or minimize the propagation of damage that may lead to progressive collapse by means of robust design strategies. As a typical approach to model progressive collapse and assess robustness, the Alternate Path Method (APM) allows
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The role of CFRP strengthening in improving the punching shear behavior of heat-damaged flat slabs with openings of different sizes and locations Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-07 Bara'a R. Alnemrawi, Rajai Z. Al-Rousan, Ayman N. Ababneh
The punching shear behavior of twenty simply supported RC flat slabs of mm) dimensions was examined in this study where concentrated loading was applied using a 150 mm central square column. However, the effect of the following parameters was evaluated: (1) CFRP strengthening, (2) ambient and elevated temperatures (23 C, 200 C, 400 C, and 600 C), (3) opening existence (with or without), (4) opening
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Hydrogen diffusion simulation of the X80 pipeline steel girth weld zone considering the synergistic effect of the structure–stress–concentration field Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-07 Taolong Xu, Sihan Guo, Bangwen Fu, Xiaoling Ma, Haoyu Han, Youlv Li, Hongye Jiang
Hydrogen embrittlement failure, caused by hydrogen permeation and diffusion in the girth weld zone of pipelines, is the main obstacle to large-scale hydrogen blending transportation. Accordingly, a three-dimensional model of the girth weld zone of X80 pipeline steel was established. Considering the influence of structural inhomogeneity in the weld zone, multi-field sequential coupling simulation technology
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Study on creep characteristics of granite of deep tunnel affected by joint orientation Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-06 Mengfei Jiang, Jun Zhao, Chengxiang Yang, Chen Fan
Joints are an important part of rock masses and the spatial relationship between joint orientation and stress (or tunnel axis) has a significant impact on the deformation, strength, and failure behavior of the surrounding rock. To study the influence of joint orientation on creep characteristics of deep hard rock, the true triaxial creep tests were performed in the laboratory on natural jointed granite
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Retraction notice to “An assessment of photovoltaic module degradation for life expectancy: A comprehensive review” [Eng. Fail. Anal. 156 (2024) 107863] Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-06 Abhinav Kumar, Halan Ganesan, Vishnu Saini, Hamad R Almujibah, Petros Petrounias, J.V. Muruga Lal Jeyan, Shubham Sharma, Ashish Agrawal
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Influence of defects formation on the cracking behavior of LPBFed Cu-Cr-Zr alloy: Micro-mechanism and CRITIC-WASPAS approach Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-06 M. Saravana Kumar, N. Jeyaprakash, Che-Hua Yang
Advanced strategies and techniques in the Laser Powder Bed Fusion (LPBF) process for printing Cu-Cr-Zr alloy must be created to overcome the major flaws such as cavity formation, unstable thermal capillary convection and thermodynamic instability. In this research, the significant process variables in the LPBF techniques such as Laser Power (LP) of 430, 500 and 570 W, Scanning Velocity (SV) of 550
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On the ice induced damage of reservoir drainage tower: A thermal stress-involved contact simulation Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-05 Huimin Han, Lei Shen, Maosen Cao, Li Wei, Xiangdong Qian
Ice thermal stress is an important factor causing damage to reservoir structures (e.g., drainage towers) in cold regions. It is very important to reveal the damage mechanism of ice thermal stress on reservoir structures to prevent such damage. The key to understanding this mechanism is to figure out the contact force between ice and structure. However, existing models do not investigate how changes
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An analytical approach to study the reinforcement performance of rock anchors Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-05 Jianhang Chen, Wenbo Zhang, Junming Ma, Banquan Zeng, Yu Huang
Rock anchors are widely used in rock reinforcement in civil engineering. However, little analytical research has been performed to investigate the anchoring performance of rock anchors when the grout and rock are simultaneously considered. This manuscript proposed an innovative mechanical model for rock anchors when grout flutes and rocks are considered simultaneously. Grout flutes and rocks were combined
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Failure mechanisms and seismic fragility analysis of overhead transmission lines incorporating pile-soil-structure interaction Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-04 Juncai Liu, Xiangrui Meng, Li Tian, Qingtong Jin, You Dong, Meng Yang, Kaiyue Liu
Overhead transmission lines (OTLs) are responsible for long-distance electric power transmission from power plants to end-users, inevitably passing through seismically active regions. A thorough literature review regarding seismic design and assessment of various structures underscores the significance of incorporating soil-structure interaction (SSI) and depth-varying spatial effect (DVSE). However
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Effective implementation of numerical models for the crashworthiness of composite laminates Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-02 M.P. Falaschetti, F. Rondina, N. Zavatta, E. Troiani, L. Donati
Crashworthiness is the capability to leverage the controlled failure of a structure to dissipate the kinetic energy of an impact, thus protecting occupants of vehicles and valuable equipment. Composite materials have exciting potential in airborne and ground vehicles' crashworthy structures thanks to their high Specific Energy Absorption. However, their performances depend on several design factors
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Fitness-for-Service assessment of a Hydrogen-Induced crack in an inlet gas separator pressure vessel using computational modelling Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-02 Sh. Zangeneh, H.R. Lashgari
Hydrogen-induced cracking is the cracking of carbon steel or low-alloy steel in a wet HS environment, driven by the diffusion of hydrogen atoms into the steel due to corrosion reaction. The formation of blisters and hydrogen-induced cracks in pressurized components in the oil and gas or petrochemical industries imposes a serious risk to personnel safety and production continuity. In this study, a fitness-for-service
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Insight into the corrosion susceptibility and failure mechanism of Cu-Ni alloy pipeline welded joints in simulated marine environment Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-02 Yue Hou, Yanan Pu, Shougang Chen, Zihao Guo, Su Hou, Wei Wang
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Dilatancy and Multi-Scale failure characteristics of a foliated rock under triaxial confinement unloading conditions Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-02 Zhao-Qiang Zheng, Qing-Xin Kong, Ming-Li Xiao, Jian-Liang Pei, Li Zhuo, Jiang-Da He
Controlled by the foliation structure, foliated rocks exhibit mechanical anisotropy and cause squeezing deformation and subsequent supporting structure failure during tunnel excavation. Here, the deformation and failure characteristics of a phyllite under unloading stress paths were experimentally investigated. The strength and elasticity parameters of phyllite exhibited moderate ‘shoulder’ shaped
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Mechanical behaviors of segmental lining of shield tunnels: A comparison between stagger-jointed and cross-jointed assembly type Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-01 Dong-Lin Feng, Zi-Han Yang, Huai-Na Wu, Fan-Yan Meng, Yu Li, Ren-Peng Chen
The assembly type of segmental linings has a great impact on mechanical behaviors and failure mechanism of the linings. In this paper, a sophisticated 3D FEM model for segmental linings with different assembly types (single ring, three rings cross-jointed and stagger-jointed) was established to investigate the mechanical behaviors and failure mechanism of the linings under loading condition, with particular
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3D rolling contact finite element analysis of high-speed railway turnout considering ratchetting effect Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-03-01 Yihang Wu, Jizhong Zhao, Hongchen Miao, Xu Zhang, Zefeng Wen, Jingmang Xu, Ping Wang, Qianhua Kan
The present work introduces a three-dimensional finite element model for the wheel-turnout-sleeper system, incorporating a cyclic constitutive model that accurately captures the nonlinear hardening behavior of rail steel under cyclic loadings. At the same time, a mixed implicit-explicit finite element method is employed to investigate the transient rolling contact behavior of wheel-turnout. Through
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Corrigendum to “An investigation on residual stress and fatigue life assessment of t-shape welded joints” [Eng. Failure Anal. 141 (2022) 106685] Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-29 Jeetendra Mourya, Greg Wheatley, Mohammed Nizam Khan, Reza Masoudi Nejad, Ricardo Branco, Wojciech Macek
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Rate-dependent mechanical characteristics of rock-like specimens containing single closed crack Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-29 Yanhui Xi, Guansuo Dui, Zhenyu Sun, Dianen Wei
Uniaxial compression test was carried out to study the combined effects of inclination angle of prefabricated closed crack and strain rate on the mechanical properties and fracturing behaviors of fissured rock. The experimental results demonstrate that strain rate and inclination angle of closed crack significantly affect the mechanical properties and fracturing behaviors of fissured specimens. Under
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Effect of fatigue damage originating from strong ground motions on the failure modes of railway simply-supported girder bridge with short piers Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-29 Peiyao Fu, Xiaozhen Li, Lueqin Xu
Strong ground motions are essentially the low-cycle loads with remarkable broadband frequency energy deteriorating structural strength and ductility, and thus result in brittle-risk seismic damage to structures, i.e., the cumulative fatigue degradation effect, especially for the short-pier bridges that are particularly dynamically sensitive to the fatigue loads promoting the occurrences of flexure-shear
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Analysis of stress environment and deformation failure of surrounding rock in deep roadway after pressure relief: A case study Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-29 Shang Yang, Jianguo Ning, Xiulong Zhang, Jun Wang, Xinshuai Shi
High-pressure hydraulic slotting (HPHS) is a new method for relieving pressure and releasing energy in deep roadways. The similarities and differences between stress environment and deformation failure of surrounding rock in deep roadways after HPHS and large-diameter drilling (LDD) are not well understood. In this paper, a theoretical model for HPHS and a theoretical model for LDD in deep roadways
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Carbody abnormal lateral vibration failure of high–speed train induced by the coupling factor of the wheel re–profiling method and excessive rail wear Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-29 Yixiao Li, Liangcheng Dai, Zhaotuan Guo, Maoru Chi
Low–frequency carbody swaying, a common abnormal lateral vibration failure during the commercial operation of high–speed trains, could seriously deteriorate passengers' ride comfort. Certain high–speed trains were detected to suffer from abnormal carbody vibration on certain railway lines, apart from which there were no abnormal vibrations detected. Investigation and analysis of this unusual failure
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Constitutive modeling of weak interlayer zone subject to unloading stress paths in underground excavation based on modified equivalent plastic work Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Shuqian Duan, Hao Wang, Po Gao, Dingping Xu, Quan Jiang, Bei Cao, Xiqing Jiang, Jiecheng Xiong
A simple yet innovative constitutive model of the weak interlayer zone (WIZ) is proposed to represent the unloading mechanical response and the failure mechanism of WIZ under complex unloading stress paths in underground excavation based on credible experimental results. The established model employs a modified equivalent plastic work with obvious stress path independency as the hardening parameter
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Online prediction of mechanical and electrical quality in ultrasonic metal welding using time series generation and deep learning Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Honghuan Chen, Xin Dong, Yaguang Kong, Zhangping Chen, Song Zheng, Xiaoping Hu, Xiaodong Zhao
Ultrasonic metal welding (UMW) is a reliable solid-state joining technique used in manufacturing lithium batteries and wire terminals. Current research leverages deep learning methods to predict tensile strength of UMW joint. However, there is a gap in studying the prediction of contact resistance in UMW joints, which is a critical factor in the performance of lithium batteries and wire terminals.
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Hydrogen embrittlement behaviors during SSRT tests in gaseous hydrogen for cold-worked type 316 austenitic stainless steel and iron-based superalloy A286 used in hydrogen refueling station Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Akihiko Fukunaga
To consider an appropriate evaluation method for hydrogen compatibility, slow strain rate tensile (SSRT) tests were conducted on high strength piping materials, cold-worked type 316 austenitic stainless steel (SUS316CW) and iron-based superalloy A286, used in hydrogen stations for two years.
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Damage of a post-tensioned concrete bridge – Unwanted cracks of the girders Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Bartosz Sobczyk, Łukasz Pyrzowski, Mikołaj Miśkiewicz
The cracking of a post-tensioned T-beam superstructure, which was built using the incremental launching method, is analyzed in the paper. The problem is studied in detail, as specific damage was observed in the form of longitudinal cracks, especially in the mid-height zone of the girder at the interface of two assembly sections. The paper is a case study. A detailed inspection is done and non-destructive
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Mode-I fracture toughness of hygrothermally aged curved filament-wound carbon and glass fibre composites Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Artur Pollet, José Humberto S Almeida Jr, Antonios G Stamopoulοs, Sandro C. Amico
This work aims to assess the effect of hygrothermal ageing on the Mode-I fracture toughness behaviour of glass/epoxy and carbon/epoxy composites manufactured by filament winding. Cylinders (136 mm in diameter) are manufactured using various winding angles (±0°, ±15°, ±30° and ± 45°), and the specimens are aged in water at room temperature and 70 °C. Water uptake was monitored until equilibrium, which
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Welding under service conditions — Resulting weld quality and fatigue strength assessment Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Florian Begemann, Johanna Müller, Julian Unglaub, Klaus Dilger, Klaus Thiele, Jonas Hensel
Steel structures, such as bridges, must be continuously maintained. Due to increasing traffic loads, design and execution shortcomings, many steel bridges are subject to various types of damage, such as cracks. The bridges must be maintained by crack removal and re-welding the cracks. During this work, the bridge is closed for traffic in order to suppress the crack flank movement during welding. As
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Erosion-corrosion failure analysis of the elbow pipe of steam distribution manifold Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Rehan Khan, Abdel-Hamid.I. Mourad, Michał Wieczorowski, Darko Damjanović, William Pao, Ammar Elsheikh, A.H. Seikh
This work discusses a case study of the failure of rice condition plant boiler pipe fittings. The failure analysis was performed on the 45° and 90° API 5LX65 steel pipe elbows connected to a steam manifold in a boiler of a rice conditioning plant. Failure analysis was performed by visual observation, microscopic analysis, hardness measurements, and numerically by Computational Fluid Dynamics (CFD)
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Failure analysis based optimum hole spacing of underexcavation for leaning building rectification Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-28 Qingxia Yue, Shuangping Zhang, Xin Zhang, Alfredo H.-S. Ang
The underexcavation technique is one of the most commonly used ones for the rectification of leaning buildings. It usually involves hole digging, and soil removing in the base. The potential failure of the soil between the digging holes determines the hole spacing, which is of critical importance in the safety and efficiency of the entire rectification procedure. The determination of the hole spacing
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Effects of uncontrolled combustion in a power plant gas turbine on fracture surface features and microstructural evolutions of a nickel-based superalloy blades Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-27 Hamidreza Mohammadi, Saeed Khani Moghanaki, Aliakbar Fallah Sheykhlari
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Load spectrum extrapolation method for fatigue damage of the turnout based on kernel density estimation Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-27 Xiaoxue Zhu, Jingmang Xu, Yuan Li, Mingyang Hou, Yao Qian, Ping Wang, Jiayin Chen, Zheng Yan
The 200 km/h mixed passenger and freight railway with movable-point frog requires a comprehensive consideration of factors such as the heavy axle loads of freight trains, the high operating speeds of passenger trains, and the complex and variable wheel-rail contact in the frog areas. Components with variable cross-sections, such as the point rail, are more susceptible to fatigue damage. This study
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Failure analysis of welded joint with multiple defects by extended Finite Element Method and Engineering Critical Analysis Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-27 Mihajlo Arandjelovic, Branislav Djordjevic, Simon Sedmak, Dorin Radu, Ana Petrovic, Stefan Dikic, Aleksandar Sedmak
Failure analysis of welded joint with multiple defects was performed taking into account the effect of all defects, not just a dominant one. Four cases of multiple defects in welded joint under the uniaxial tensile loading were investigated using extended Finite Element Method. Two-dimensional Finite Element Models were made according to the tensile specimens with initial crack located in a critical
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Role of foliation occurrence and stress orientation on asymmetric failure in foliated rock tunnel: insight from numerical simulation Eng. Fail. Anal. (IF 4.0) Pub Date : 2024-02-27 Xufeng Liu, Peng-Zhi Pan, Yangyi Zhou, Zhaofeng Wang, Dingping Xu
The failure problem of deep-buried foliated rock tunnel is very prominent, which often presents asymmetry. Moreover, this failure is closely related to foliation occurrence and in-situ stress, and its mechanism is still unclear at present. In this study, a deep buried foliated rock tunnel in a hydropower station was taken as a case, and its failure mechanism was studied by using CASRock software embedded