In this paper, the deformation, fracture and damage behavior of SiC_p/Al composites are studied by experiments and finite element analysis. The crack cracking process of the material was observed by in-situ tensile test, it was found that the composite first produced microcracks near the particles, and the cracks mainly spread to depth and then to both sides. It is determined by a tensile test that the fracture mechanism of the material is the tearing of the aluminum matrix and the peeling between the particles and the matrix. The tensile damage mechanism of the composite material in three directions (rolling direction, rolling transverse direction and rolling normal direction) and different strains were determined. It is found that in the process of tensile deformation, micro-cracks are first formed at the defects (voids) and weak interfaces, and many fine cracks converge together to form large cracks leading to the fracture of the material, during which a few particles fall off, but there is no particle fracture. The global and local tensile tests of the composites were simulated by finite element method, the results of the stress-strain state under different strains and the effects of particles on the materials are analyzed in detail, and the validity of the test results is determined.

本文研究了SiC _p的变形，断裂和损伤行为。通过实验和有限元分析研究了/ Al复合材料。通过原位拉伸试验观察材料的裂纹开裂过程，发现复合材料首先在颗粒附近产生微裂纹，裂纹主要向深处扩散，然后向两侧扩散。通过拉伸试验确定该材料的断裂机理是铝基质的撕裂以及颗粒与基质之间的剥离。确定了复合材料在三个方向（轧制方向，轧制横向和轧制法向）的拉伸损伤机理以及不同的应变。发现在拉伸变形过程中，首先在缺陷（空隙）和弱界面处形成微裂纹，并且许多细小裂纹会聚在一起形成大裂纹，导致材料破裂，在此期间一些颗粒脱落，但没有颗粒破裂。通过有限元方法对复合材料的整体和局部拉伸试验进行了模拟，详细分析了不同应变下的应力-应变状态结果以及颗粒对材料的影响，确定了试验结果的有效性。