本文在疲劳累积损伤模型和刚度降模型的基础上,根据疲劳损伤的两阶段理论,将复合材料的疲劳损伤划分为两个阶段,并用两种不同的函数分段描述疲劳损伤的过程,建立了疲劳损伤演化两阶段模型.利用试验数据,运用多元函数的最小二乘法,得到了模型中的各个参数的拟合值和层合板的S-N曲线.疲劳损伤演化两阶段模型计算数据与试验结果吻合较好.
No matter composite laminates is subjected to static or dynamic load,damage is significantly complex.Accurate modeling for fatigue damage can reveal the damage mechanism of composite laminates.In this paper,based on the cumulative damage theory and stiffness reduction model,fatigue damage of the composite was divided into two stages by the two-stage theory of the fatigue damage.The fatigue damage process of composite was established by a segmented function and two-stage model of fatigue damage.The segmented function includes two kinds of difference functions,exponential function and linear function.By using the experimental data and least square method of multivariate function,the parameters of this two-stage fatigue damage process model and the S-N curve were obtained.The S-N curve was compared with that of experimentation and classical model.And the results obtained by present method are in good agreement with the results of experimentation.
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