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颗粒增强型复合材料宏观表现为均质性能,而细观尺度则表现为各相异性,因此对材料的损伤研究带来关键问题—不同尺度间的损伤传递与解释。基于细观力学方法探索了材料细观结构的损伤形式、损伤机制及裂纹的演化扩展规律。首先借助细观力学内聚力模型,采用有限单元法完成了单颗粒情况下界面相组分对材料宏观力学性能的影响;进而基于随机序列吸附算法,将单颗粒推广至弥散多颗粒情况,研究了颗粒的数量、尺寸大小对材料宏观非线性力学行为的影响以及材料在拉压载荷下的非对称力学行为。
Particle reinforced composites show homogeneity macroscopically, while mesoscale ones show anisotropy. Therefore, the study on material damage brings about the key problem - the transmission and interpretation of damage between different scales. Based on the meso-mechanics method, the damage form, damage mechanism and crack growth and propagation of the mesostructure were explored. Firstly, the effect of interfacial phase composition on the macroscopic mechanical properties of the material under the condition of single particle was achieved by means of the micro-mechanics cohesion model and the finite element method. Based on the random sequence adsorption algorithm, the single particle was extended to the dispersed multiparticulate. The influence of the size and size of the material on the macroscopic nonlinear mechanical behavior of the material and the asymmetric mechanical behavior of the material under tensile and compression loads.