Motivated by the different uniaxial responses of two actual materials filled with either sifted glass beads or sifted glass grits, the influence of the fillers shape on the finite strain behavior of highly filled composites ($>$50%) is examined through micromechanical finite element simulations accounting for matrix/filler debonding with a cohesive-zone model. Three-dimensional matrix cells filled with 64 monosized spherical particles are compared to cells filled with the same number of monosized polyhedra. For this purpose, an original generation process was developed to obtain periodic cells with random dispersions of non-regular polyhedra. Finite element simulations of uniaxial tensile tests on the periodic cells allow studying the influence of the fillers shape on the macroscopic behavior and on the local damage at the matrix/filler interfaces. Actually, the presence of sharp edges and apexes for polyhedral particles seems to have a second order impact compared to the cohesive-zone parameters. The damage fields demonstrate the same trends for both particles shapes. The different behaviors observed on actual composites are rather due to different adhesion properties between fillers and matrix than to the shape of particles.

受两种实际材料的不同单轴响应的影响，这些材料填充了筛分的玻璃珠或筛分的玻璃砂，填料形状对高填充复合材料的有限应变行为的影响（$>$50％）通过微机械有限元模拟进行检查，该模拟考虑了具有粘结区模型的基体/填料剥离。将填充64个单一尺寸球形颗粒的三维矩阵单元与填充相同数量的单一尺寸多面体的单元进行比较。为了这个目的，开发了原始的产生方法以获得具有非规则多面体的随机分散的周期细胞。对周期电池进行单轴拉伸试验的有限元模拟可以研究填料形状对宏观行为以及基体/填料界面处的局部损伤的影响。实际上，与内聚区参数相比，多面体颗粒的尖锐边缘和顶点的出现似乎具有二级影响。两种颗粒形状的破坏场都显示出相同的趋势。