一种纤维增强复合材料的力学化学疲劳模型

New Mechano-Chemical Fatigue Model for Fiber-Reinforced Composites

在充分考虑疲劳过程中聚合物基复合材料内部所发生的化学变化的基础上 ,引入周期力学活化能和剩余强度系数的概念 ,提出了一种新的纤维增强复合材料的力学 化学疲劳模型 ,从力学化学效应的角度可以较好地解释间歇疲劳寿命大于连续疲劳寿命、含氢键介质可以延长材料的疲劳寿命等现象 ,而且采用这种力学 化学疲劳模型对复合材料疲劳过程的剩余强度进行预测 ,其结果与试验值吻合得很好 .

A new mechano chemical fatigue model for fiber reinforced composites was developed, and the cyclic activation energy and the factor of residual strength were included in this residual strength based model to reflect the effect of chemical reaction caused by the mechanical activation when the composites are subjected to cyclic loads. Based on this model, the reasons of many strange phenomena could be expressed easily, e.g.the fact that the intermittent fatigue life is much longer than continuous fatigue life. The statistical distribution of the residual strength is derived from this model and compared with Schaff's model, Whitworth's model and the available experimental data, and good agreement is observed between this prediction model and experimental results.