| 赵维涛,刘春升,朱珒婧.考虑静强度的复合材料疲劳寿命预测及概率特性分析[J].计算力学学报,2024,41(4):696~701 |
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| 考虑静强度的复合材料疲劳寿命预测及概率特性分析 |
| Prediction and probability characteristic analysis of fatigue life for composite materials considering static strength |
| 投稿时间：2023-02-08 修订日期：2023-06-12 |
| DOI：10.7511/jslx20230208001 |
| 中文关键词: 疲劳寿命 复合材料 静强度 概率特性 S-N曲线 |
| 英文关键词:fatigue life composite material static strength probabilistic characteristics S-N curve |
| 基金项目:国家自然科学基金(12272240)资助项目. |
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| 中文摘要: |
| 为考虑初始静强度对疲劳寿命的影响,基于经典剩余强度理论,构建同时考虑初始静强度和应力的复合材料疲劳寿命预测模型。建立的寿命预测模型能够表征疲劳寿命与初始静强度和应力之间的内在关系,可退化为经典S-N曲线。疲劳寿命与初始静强度呈非线性关系,疲劳寿命与应力呈高度非线性关系,疲劳寿命的概率分布可根据初始静强度和应力的概率分布利用MCS获得。算例表明,初始静强度和应力的概率特性对剩余强度和疲劳寿命的概率特性均有影响,相比初始静强度,应力对疲劳寿命概率特性的影响更加显著。 |
| 英文摘要: |
| 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. |
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