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中文摘要：
通过发展一种三段式单元，改进了颗粒复合材料的梁网格断裂模型。根据单元内各段交接处的平衡条件推导了单元刚度矩阵。与已有的模型相比，改进的模型能够更加真实的反映颗粒和基体之间的界面区域，并且能够容纳小于网格尺寸的颗粒。计算结果表明利用改进的模型能够得到合理的力－位移关系和断裂模式。
英文摘要：
The beam lattice fracture model for particle composites is improved by adopting a three-fragment element. The element stiffness matrix is derived based on equilibrium conditions at joints between fragments. A comparison with the existing model shows that the improved model can simulate the interface zone between aggregate and matrix more realistically, and can include aggregates smaller than the lattice＇s discretization size. Numerical results show that the improved model can simulate force-displacement relations and crack patterns.
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