复合材料层合板冲击后压-压疲劳寿命预测方法

针对冲击后复合材料层合板, 发展了含冲击初始损伤层合板的压-压疲劳寿命预测方法。该方法基于无损单向板的力学性能和疲劳特性, 对不同铺层参数、 不同几何尺寸以及不同冲击条件下层合板的疲劳寿命进行预测。为消除人为假设冲击损伤造成的误差, 对层合板在冲击载荷及冲击后疲劳载荷作用下的破坏进行全程分析, 即把冲击后层合板的实际损伤状态直接作为疲劳分析的初始状态。同时基于逐渐损伤思想, 推导了含冲击初始损伤层合板的应力分析过程, 建立了相应的三维逐渐累积损伤模型, 开发了参数化的复合材料层合结构冲击及冲击后疲劳破坏模拟程序, 为复合材料层合结构的抗冲击设计及其疲劳损伤扩展行为研究提供了较好的技术平台。 

Prediction method for fatigue life of laminated composites after impact under compression-compression loading

A prediction method for the compression-compression fatigue life of laminated composites with impact damage was developed, which can predict the fatigue life of laminated composites with different ply parameters, geometry measures, and impact conditions based on mechanic properties and fatigue characteristics of unidirectional plies. The whole damage process of laminated composites under the impact loading and fatigue loading was analyzed for avoiding the errors induced by an impact damage hypothesis. The real impact damage status of composite laminates has been applied to analyze the fatigue life. Based on the progressive damage theory, the stress analysis was deduced. A 3-D progressive damage model for laminated composites with impact damage was established. A parametric modeling program was developed to predict the impacf damage process and fatigue life of laminated composites, which provides a better technical platform for impact resisting design andfatigue research of laminated composites.