基于多尺度模拟的颗粒弥散材料界面相性能研究

Study on Interfacial Phase Property of Particle Dispersion Materials Based on Multiscale Simulation

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。

The macro-performance of particle reinforced composites is homogeneousness, whereas the meso-scale of that is anisotropy, therefore, the key problem of propagation and interpretation between different scales in the study of material damage was put forward. In this paper, the damage form, mechanism and evolution law of crack propagation were explored based on the meso-mechanical method. Firstly, with the meso mechanical cohesive zone model, the finite element method was adopted to study effects of the single particle interface phase group on macroscopic mechanical properties of the materials~ Then based on the random sequential adsorption algorithm, the model was extended to the condition of multi-particle dispersion. Finally, the effect of particle number and size on nonlinear macroscopic mechanical behaviour of materials and the symmetrical mechanical behavior of materials in non tensions and compression was investigated.