脆性无序介质冲击破碎过程及其非线性动力学特性的细观模拟

为了模拟脆性无序介质的冲击破碎过程以及揭示其所伴随的非线性动力学特性，提出了梁－颗粒细观数值模型。在该模型中，介质被随机地离散成Ｖｏｒｏｎｏｉ多边形单元，相邻多边形采用弹脆性梁单元联结，介质的连续损伤和破坏由梁单元的断裂来模拟。算例表明，梁－颗粒细观数值模型不仅能实时给出介质的破碎图象及其分形维数，而且还能模拟介质内部应力和质点运动速度随时间的演化过程。

MESO LEVEL MODELLING OF IMPACT FRAGMENTATION PROCESSES AND THEIR NONLINEAR DYNAMIC FEATURES IN BRITTLE DISORDERED MATERIALS

In order to study the impact fragmentation in britle disordered materials and reveal the non linear dynamic features concealed in the damage processes,a meso mechanical beam particle model is proposed in this paper.In the model,the material is schematized as an assembly of discrete, interacting Voronnoi polygons which are linked through a network of brittle breakage patterns and their corresponding fractal dimensitons can be given at any time using the model,but also the evolution histiory of the stresses in patricls as well as their relevant velocities can be simulated.