考虑应力梯度的缺口疲劳寿命预测方法

王延荣; 李宏新; 袁善虎; 魏大盛; 石亮

考虑应力梯度的缺口疲劳寿命预测方法

1.
北京航空航天大学能源与动力工程学院, 北京 100191
2.
中国航空工业集团公司沈阳发动机设计研究所, 沈阳 110015

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出版历程
- 收稿日期: 2012-06-11
- 刊出日期: 2013-06-28

Method for notched fatigue life prediction with stress gradient

1.
School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2.
Shenyang Engine Design and Research Institute, Aviation Industry Corporation of China, Shenyang 110015, China

摘要

摘要: 基于试样缺口根部区域应力分布规律,综合考虑了平均应力、应力梯度及尺寸效应的影响,发展了一种考虑梯度影响的缺口疲劳寿命预测方法.以TC4合金材料含两种形式缺口的试样为例,计算得到了缺口应力梯度影响因子和尺寸效应影响因子,并进行了疲劳寿命预测.寿命预测结果表明:引入缺口局部平均应力、应力梯度影响因子和尺寸效应影响因子可以较为全面地考虑缺口对试样疲劳寿命的影响,基于所发展的缺口疲劳寿命预测方法给出的TC4合金缺口试样疲劳寿命预测结果在2倍分散带以内.
- 缺口疲劳 /
- 平均应力 /
- 应力梯度 /
- 尺寸效应 /
- 寿命预测
Abstract: A method for fatigue life prediction of notched specimen or real component when taking the effects of mean stress,stress gradient and dimensional size into consideration was developed based on the distribution of dimensionless stress at notch root of the specimen.The factors for stress gradient and dimensional size were calculated and the fatigue life was predicted for two types of notches machined with TC4 alloy.The results show that mean stress at notch root and the factors for stress gradient and dimensional size could reflect the effects of notch on the fatigue life.Predictions based on the developed approach give estimates falling within 2-fold scatter.
- notched fatigue /
- mean stress /
- stress gradient /
- size effect /
- life prediction

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参考文献(19)

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