Abstract

The microstructures and local characteristics of ordinary refractory ceramics are heterogeneous. The discrete element (DE) method was used to consider the variation in particle spatial distributions and statistically distributed interface properties (uniform, Weibull) between elements. In addition, three Weibull distributions with different shape parameters were evaluated. A uniaxial tensile test was used to study the effects of particle spatial distributions and interface property distributions on the stress–strain curve, tensile strength, and crack propagation. The results of the test show that the particle spatial distribution significantly influences crack propagation and fracture patterns, and the interface condition plays an important role in mechanical responses, crack propagation, and fracture mechanisms and patterns. The discrete element modelling of uniaxial tensile and compressive tests shows that brittle materials exhibit asymmetric mechanical responses to compression and tension loading including static Young’s modulus.

中文翻译：

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应用离散元建模确定颗粒空间分布和界面不均匀性对普通耐火陶瓷拉伸断裂的影响

摘要

普通耐火陶瓷的微观结构和局部特征是不均匀的。离散元（DE）方法用于考虑颗粒空间分布的变化和元素之间统计分布的界面特性（均匀，威布尔）。此外，还评估了具有不同形状参数的三个威布尔分布。采用单轴拉伸试验研究颗粒空间分布和界面性质分布对应力应变曲线、拉伸强度和裂纹扩展的影响。测试结果表明，颗粒空间分布显着影响裂纹扩展和断裂模式，界面条件对力学响应、裂纹扩展以及断裂机制和模式起着重要作用。单轴拉伸和压缩试验的离散元建模表明，脆性材料对压缩和拉伸载荷（包括静态杨氏模量）表现出不对称的机械响应。