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本文按照某种石墨颗粒增强复合材料的加卸载的应力应变试验曲线提出了一种 相应于这种材料的卸载模型和加、卸载判别准则。此模型、准则和Ｊｏｎｅｓ－ Ｎｅｌｓｏｎ－Ｍｏｒｇａｎ［１］的非线性复合材料模型相结合可以解决在加、卸载下复合材 料的结构分析问题．文后列出了两种工况下石墨颗粒增强复合材料板的应力分析计 算结果．
In this paper, according to the loading and unloading stress-strain curve of certain graphite particle reinforced composites, an unloading model and loading and unloading criteria corresponding to this material are proposed. The combination of this model, criterion and the nonlinear composite model of Jones-Nelson-Morgan [1] can solve the problem of structural analysis of composites under loading and unloading. The stress analysis results of graphite particle reinforced composite plates under two conditions are listed here.