The mechanical and fracture behavior of innovative 2.5D woven fabric/aluminum composites under warp directional tension were investigated via micromechanical simulation and experiments. The tensile curves from the simulation correspond well with the testing curves, where calculation errors of the elastic modulus, ultimate strength, and fracture strain are 3.96%, 1.40%, and −5.49%, respectively. The warp yarn interface and neighboring matrix are damaged during the initial tension process. The accumulation and interaction of these damage zones lead to successive failures of the interface, matrix, and weft yarns. The axial fracture of warp yarns ultimately induces failure of the composite, which exhibits transverse crack of weft yarns with interfacial debonding and axial fracture of warp yarns with fiber pulling out. The elastic modulus and ultimate strength increased with an increase in the weft yarn layer spacing or a decrease in the warp yarn layer spacing, whereas the fracture strain decreased with an increase in the layer spacing of the warp or weft yarns.

中文翻译：

---

2.5D机织C纤维/铝复合材料在经向拉伸应力作用下的力学和断裂行为的模拟和实验研究

通过微机械仿真和实验研究了创新的2.5D机织织物/铝复合材料在经向拉伸下的力学和断裂行为。模拟的拉伸曲线与测试曲线非常吻合，其中弹性模量，极限强度和断裂应变的计算误差分别为3.96％，1.40％和-5.49％。经纱界面和相邻基体在初始拉伸过程中会损坏。这些损坏区域的积累和相互作用导致界面，基体和纬纱的连续破坏。经纱的轴向断裂最终导致复合材料的破坏，表现出纬纱的横向裂纹和界面脱粘，而经纱的轴向断裂又被纤维拉出。