影响冲击载荷下脆性材料碎片尺度的因素

Factors controlling sizes of brittle fragments due to impact loadings

概括回顾近年我们针对脆性材料受冲击拉伸载荷时的断裂及破碎现象的理论分析及数值模拟成果。重点分析碎片尺度对材料参数及加载速率的依赖关系.通过量纲分析.动力学模拟以及数值实验.建立了一个酱适性的无量纲关系用以评估碎片尺度。

This paper briefly reports our recent progresses in the analytical and numerical studies on the dynamic fragmentation of brittle materials. The research renders a universal function for estimating the fragment size from the material parameters and the external strain rate. The curve of this function is plotted against the popular energy models, which was firstly presented by Grady and later modified by Glenn and Chudnovsky, to show the differences. Comparisons with other numerical resuits and the experimental data show that the present model is more reasonable. Based on the theoretical analysis, we discuss further on the design and conduction of the experiments which are aimed to study the brittle fragmentation phenomenon.