2.5维机织复合材料疲劳寿命预测

对2.5维机织复合材料进行了静力分析,在受拉伸载荷的情况下将其视为经纱层和纬纱层组合而成的层合板。以单向板疲劳寿命预测为基础,考虑到疲劳加载过程中刚度退化导致的应力重新分配,采用Miner理论对其拉-拉疲劳寿命进行预测,且对该方法进行了试验验证,为预测2.5维机织复合材料的疲劳寿命提供了一种途径。

Fatigue Life Prediction for 2 . 5 D Woven Composites

2. 5-dimensional woven composite was subjected to static loading, and it was regarded as a laminate consisting of warp layer and weft layer under tensile loading. Based on the fatigue life prediction of unidirectional laminate , the fatigue life of 2 . 5-dimensional composites was predicted by using Miner Theory of linear fatigue dam-age accumulation and considering the stress redistribution resulting from the degradation of stiffness in the process of fatigue loading. The verification experiment result of tensile-tensile fatigue loading conformed to the prediction re-sult. This paper provides a new method for predicting the fatigue life of 2. 5-dimensional woven composites.