Prediction and probability characteristic analysis of fatigue life for composite materials considering static strength
In order to consider the influence of initial static strength on fatigue life,a fatigue life prediction model of composite materials is established considering both initial static strength and stress based on the classical residual strength theory.The proposed life prediction model can represent the internal relationships between fatigue life and initial static strength and between fatigue life and stress,and can cover the classical S-N curve.The relationship between fatigue life and initial static strength is nonlinear,and the relationship between fatigue life and stress is highly nonlinear.The probability distributions of fatigue life can be obtained by using MCS according to the probability distribution of the initial static strength and stress.Numerical examples show that the probabilistic characteristics of the initial static strength and stress have an effect on the residual strength and the probabilistic characteristics of fatigue life,and the stress has a more significant effect on the probabilistic characteristics of fatigue life than the initial static strength.
国家科技期刊平台
NSTL
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