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Residual strength and life prediction of composites based on static strength distribution parameters

DOI：10.7511/jslx20220729001

 作者 单位 E-mail 赵维涛 沈阳航空航天大学 航空宇航学院, 沈阳 110136 zhwt201@163.com 朱珒婧 沈阳航空航天大学 航空宇航学院, 沈阳 110136 刘春升 沈阳航空航天大学 航空宇航学院, 沈阳 110136

为探讨剩余强度及疲劳寿命与初始静强度分布参数之间的关系,构建基于初始静强度分布参数的剩余强度和疲劳寿命计算模型。在模型构建过程中未涉及复合材料结构的层数、铺层厚度和铺层方向,适应性强。模型参数可通过静力试验和剩余强度试验获得,试验成本相对疲劳试验较低。剩余强度和疲劳寿命与初始静强度变异系数及其分布参数有关,当初始静强度服从威布尔分布时,疲劳寿命亦服从威布尔分布,可为开展疲劳可靠性提供借鉴和参考。算例表明,基于建立的模型,剩余强度计算结果最大误差为-1.58%,疲劳寿命与试验数据吻合较好。

To reveal the relationship of residual strength and fatigue life with initial static strength distribution parameters,calculation models of residual strength and fatigue life based on initial static strength distribution parameters are constructed.The number of layers,ply thickness and ply angle of the composite structure are not involved in the process of model construction,so the models have strong adaptability.The model parameters can be obtained from a static test and a residual strength test,thus the test cost of the proposed method is lower than that of a fatigue test.The residual strength and fatigue life are related to the variation coefficient and distribution parameters of the initial static strength.When the initial static strength obeys the Weibull distribution,the fatigue life also obeys the Weibull distribution,which can provide a reference for fatigue reliability.The example shows that the maximum error of the residual strength calculation result is -1.58% and the fatigue life fits well with the test data.