| 一种新的随机疲劳寿命预测方法 |
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| 引用本文： | 尚德广, 王大康. 一种新的随机疲劳寿命预测方法[J]. 北京工业大学学报, 2001, 27(4): 433-436. |
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| 作者姓名： | 尚德广 王大康 |
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| 作者单位： | 1.北京工业大学 机械工程与应用电于技术学院 北京 100022 |
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| 基金项目： | 教育部高校骨干教师资助计划;M01020002; |
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| 摘 要： | 根据疲劳损伤具有局部性的特点,在应力场强法的基础上,提出了缺口疲劳损伤局部应力应变场理论;该理论可同时考虑缺口根部局部应力应变梯度对疲劳损伤的影响.通过对缺口件进行随机交变加载下的弹塑性有限元分析,提出一种随机加载疲劳寿命预测的局部应力应变场强法;由该法来预测缺口件疲劳裂纹形成寿命,其精度要好于传统的局部应力应变法.
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| 关 键 词： | 随机加载 弹塑性有限元分析 局部应力应变场强 疲劳损伤 寿命预测 |
| 文章编号： | 0254-0037(2001)04-0433-04 |
| 收稿时间： | 2000-12-27 |
| 修稿时间： | 2000-12-27 |
New Prediction Method of Fatigue Life Under Random Loading |
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| SHANG De-guang, WANG Da-kang. New Prediction Method of Fatigue Life Under Random Loading[J]. Journal of Beijing University of Technology, 2001, 27(4): 433-436. |
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| Authors: | SHANG De-guang WANG Da-kang |
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| Affiliation: | 1.College of Mechanical Engineering and Applied Electronics Technology, Beijing Polytechnic University, Beijing 100022, China |
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| Abstract: | According to the characteristic that fatigue damage is partial, on the basis of the stress field intensity method, a theory of local stress-strain field for fatigue damage at notch is presented in this paper, which considers the effects of the local stress-strain' s gradient on fatigue damage. Through the finte element analysis on the elastoplasticity of notched specimen under the random alternate loading, a local stress-strain field intensity method is proposed for prediction of fatigue life under random loading. Using this method to predict the life of fatigue crack initiation has obtained better precision than the traditional local stress-strain method. |
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| Keywords: | random loading elastoplasticity finite element analysis local stress-strain field intensity fatigue damage life prediction |
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