Life prediction methodology for composite structures .1. Constant amplitude and two-stress level fatigue
Life prediction methodology for composite structures .1. Constant amplitude and two-stress level fatigue
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DOI：
10.1177/002199839703100202
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发表时间：
1997-01-01
影响因子：
2.9
通讯作者：
Davidson, BD
中科院分区：
文献类型：
--
作者：
Schaff, JR;Davidson, BD
提出了一种基于强度的磨损模型，用于预测复合材料结构在等幅或双应力水平疲劳载荷作用下的剩余强度和寿命。假定结构承受比例载荷，其剩余强度是载荷循环次数的单调递减函数，连续等幅循环的寿命分布和任意载荷历史后的剩余强度分布可用两参数威布尔函数表示。该模型还纳入了“循环混合因子”，以解释可能与负载应力幅度频繁变化相关的强度和寿命退化。从两个应力水平，单轴加载层压板的实验结果被用来评估该模型的预测能力的序列效应，如在一个低-高或高-低测试，和循环混合效应，如在一个低-高-低-高重复测试。对于所有载荷和层合板，理论和实验之间都有很好的相关性。
A strength-based wearout model is presented for predicting the residual strength and life of composite structures subjected to constant amplitude or two-stress level fatigue loadings. It is assumed that the structure undergoes proportional loading, that its residual strength is a monotonically decreasing function of the number of loading cycles, and that both the life distribution due to continuous constant amplitude cycling and the residual strength distribution after an arbitrary load history may be represented by two parameter Weibull functions. The model also incorporates a ''cycle mix factor'' to account for the degradation of strength and life that may be associated with frequent changes in the stress amplitude of the loading. Experimental results from two-stress level, uniaxially loaded laminates are used to evaluate the model's predictive capability for sequencing effects, as in a low-high or high-low test, and for cycle mix effects, as in a low-high-low-high repeating test. Good correlation between theory and experiment is obtained for all loadings and laminates studied.