纤维排列方式对复合材料弹塑性性能的影响

应用一般化单胞方法（generalized method lf cells,GMC)计算了纤维在规则排列和随机排列的对单向纤维加强金属基复合瓣总体弹塑性性能的影响，结果表明，纤维排列方式对金属基复合材料的总体弹性行为影响不大，而对总体横向弹塑性行为的影响较大，当纤维体积分数较小时（＜20％），纤维排列方式对于复合材料的本构关系影响不明显，当纤维体积分数较大时（＞20％），纤维排列方式对于复合材料的本构关系影响非常明显，而且纤维排列方式对金属基复合材料的塑性的影响顺序与对弹性行为的影响顺序相同，作者应用Bodner和Paton粘塑性统一模型描述弹塑性相的本构关系，这一模型不假设存在屈服条件，也就不必指定加载和卸载条件，可以在加载和卸载的任何时刻使用相同的公式。

Influence of Packing of Fibers on Elastic-plastic Response of Fiber-reinforced Metal Matrix Composite Material

The global elastic-plastic constitutive relation of fiber-reinforced metal matrix composite material is founded by means of generalized method of cells,for periodic and random distributions of fibers.It is shown that,the packings of fibers have relatively less influence on the elastic response of the metal matrix composites,but have much obvious influence on the elastic-plastic behavior.When the fiber ratio is lower (less than 20%),the packing modes of fibers do not have too much effect on the constitutive relation of the composite.But when the fiber ratio is higher(more than 20%),the packing modes of fibers have very remarkable effect on the constitutive relation of the composite,and the way of the effect is similar with that for elastic behavior.The unified viscoplastic theory of bodner and parton is used to describe the elastic-plastic behavior of the metal.This theory does not assume a yield condition,so it's unnecesary to assign a loading and unloading criterion.The formulas can be used at any moment of loading and unloading.