考虑应力比修正的应力梯度影响指数计算方法

魏大盛; 马梦弟; 王延荣

doi:10.13224/j.cnki.jasp.2019.09.005

考虑应力比修正的应力梯度影响指数计算方法

doi: 10.13224/j.cnki.jasp.2019.09.005

魏大盛^1,2,
马梦弟^1,2,
王延荣^1,2

1.
北京航空航天大学能源与动力工程学院,北京 100191
2.
先进航空发动机协同创新中心,北京 100191

基金项目: 国家自然科学基金(51475024)

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出版历程
- 收稿日期: 2019-03-06
- 刊出日期: 2019-09-28

Method to determine modified influence exponent of stress gradient considering stress ratio

摘要

摘要: 基于考虑应力梯度的寿命预测模型,深入研究了不同应力比对应力梯度影响指数的影响。通过引入新的参数,对模型进行修正,并以典型合金的试验数据为基础,进行寿命预测并考核计算精度。结果表明:修正后的模型能够更合理地考虑局部应力比对应力梯度影响指数的影响,寿命预测结果相比于修正前更接近试验值,对TC4(200 ℃)、GH4169(500、650 ℃)缺口试件的疲劳寿命预测结果多在2.0倍分散带以内,部分数据的预测结果可在1.5倍分散带以内。
- 寿命预测 /
- 缺口疲劳 /
- 应力梯度 /
- 应力比 /
- 参数拟合
Abstract: A new equation for fatigue life prediction considering the stress ratio was established. The expression introduced a new parameter which reflected the effect of stress ratio on the stress gradient exponent based on the previous fatigue life model with stress gradient. Life prediction and precise checking were carried out using exiting test data of typical alloy. The results showed that the local stress ratio had a considerable influence on the stress gradient exponent. The calculation results of the modified model were more close to the experiment results than the previous model. Predictions of notched specimens for TC4(200 ℃) and GH4169(500, 650 ℃) showed a scatter band within 2.0. Even better, some of the results showed a scatter band within 1.5.
- life prediction /
- notch fatigue /
- stress gradient /
- stress ratio /
- parameter fitting

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参考文献(18)

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