Abstract: Based on the equivalent homogeneous model, (, Contiaued on P.23) Continued Jrom p.44) the macro-initial-yielding of hollow microsphere filled composites is analyzed by the theoretlcal and FEM methods. The macro-initial-yielding function suggested includes the physical properties and geometric factors of the components and gives a theoretical explanation to the phenomenon that the plastic behavior of the composite is sensitive to its average stress. The comparison between the numerical calculation and experimental results shows that the theoretical analysis is reliable enough.

Key words: composite, equivalent homogeneous medium, macro-initial-yielding

摘要： 本文以等效均匀体模型为基础,结合解析法和有限元法分析空心微珠填充复合材料的宏观初始屈服面,提出了宏观初始屈服函数。函数反映了宏观初始屈服对组分介质物理性质和几何参数的依赖关系,对复合材料塑性行为的平均应力敏感性给出了理论解释。文章对宏观单向拉伸初始屈服极限的有限元计算值和实验值进行的比较表明了这种理论分析的可靠性。

关键词: 复合材料, 等效均匀体, 初始屈服