In this study, the tensile strength characteristics of the hybrid sandwich composite-to-metal specimen consisting of two steel I-beams and a T-shaped sandwich composite structure were studied. The tensile strength of the sandwich hybrid joints under design load and ultimate load has been tested. The progressive failure model is established according to the modified Shokrieh-Hashin criterion. The interface cohesive zone model is applied to reveal the damage development of the bonding layer. The stresses, strains, ultimate strength, and main damage modes of the hybrid joint under design load and ultimate load conditions are simulated and the predicted results are compared with those from tests. The experimental and numerical results show that the strain, the trend of load-displacement curves and the damage modes are in good agreement. The strength of matrix is the main factor limiting ultimate strength. Therefore, the influences of the overlapping width and thickness on ultimate bearing capacity were analyzed to obtain the optimized structural strength of the sandwich composite-to-metal bolted joints.

中文翻译：

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基于实验研究和渐进失效法的夹层复合材料-金属接头的拉伸强度分析

在本研究中，研究了由两根工字钢和T形夹层复合结构组成的混合夹层复合材料-金属试件的拉伸强度特性。测试了夹芯混合接头在设计载荷和极限载荷下的拉伸强度。根据修正的Shokrieh-Hashin准则建立渐进失效模型。应用界面内聚区模型来揭示粘合层的损伤发展。对混合接头在设计载荷和极限载荷工况下的应力、应变、极限强度和主要损伤模式进行了模拟，并将预测结果与试验结果进行了比较。实验和数值结果表明，应变、载荷-位移曲线的趋势和损伤模式具有良好的一致性。基体强度是限制极限强度的主要因素。因此，分析搭接宽度和厚度对极限承载力的影响，以获得夹层复合金属螺栓接头的优化结构强度。