A mean stress correction model for tensile and compressive mean stress fatigue loadings
A mean stress correction model for tensile and compressive mean stress fatigue loadings
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DOI：
10.1111/ffe.12553
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发表时间：
2017-06-01
影响因子：
3.7
通讯作者：
Ince, A.
中科院分区：
文献类型：
--
作者：
Ince, A.
为了考虑平均应力对疲劳寿命的影响，提出了一种新的基于变形应变能的平均应力疲劳模型。利用一种铸铁、两种钢和两种铝合金在拉伸和压缩平均应力载荷下的大量实验数据，将所提出的模型与Morrow和Smith-Watson-Topper(SWT)平均应力修正模型进行了比较。结果表明，本文提出的平均应力修正模型与SWT模型得到的结果基本一致，且对正平均应力数据和中等负平均应力数据具有很好的相关性。对于较高的平均压应力，所提出的模型表现出较好的相关性，而SWT模型不能关联疲劳数据。研究发现，Morrow模型对所有疲劳数据的相关性都很差，因为它给出了平均压缩应力的保守结果和拉伸平均应力的非保守结果。
A new mean stress fatigue model based on the distortional strain energy is proposed to account for the mean stress effects on fatigue life. The proposed model is compared with the Morrow and the Smith-Watson-Topper (SWT) mean stress correction models using a number of experimental data sets for one cast iron, two steels and two aluminium alloys under tensile and compressive mean stress loadings. It is found that both the proposed mean stress correction model and the SWT model yield similar results and provide very good correlation for positive mean stress data and moderate negative mean stress data. For high compressive mean stresses, the proposed model shows reasonably good correlations, while the SWT model fails to correlate the fatigue data. The Morrow model was found to give poor correlations for all fatigue data analysed by yielding conservative results for compressive mean stresses and non-conservative results for tensile mean stresses.