Thermal-Mechanical Fatigue Life
Prediction of Cast Aluminum Alloy Based on Improved Sehitoglu Model

doi:10.3969/j.issn.1001-2222.2025.03.011

Vehicle Engine ›› 2025, Vol. 0 ›› Issue (3) : 74-80. DOI: 10.3969/j.issn.1001-2222.2025.03.011

Thermal-Mechanical Fatigue Life Prediction of Cast Aluminum Alloy Based on Improved Sehitoglu Model

FU Yafei^1,2,TAO Shuai^1,2,JING Guoxi^1,2,YU Huichao³,DONG Changlong³,HUANG Lirong³

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Abstract

To solve the problem of predicting the thermal fatigue life of A356-T6 cast aluminum alloy cylinder heads, tensile performance tests, low cycle fatigue tests, creep tests, and thermal fatigue tests were carried out under the sampling of engine cylinder head body. The material parameters required for the Sehitoglu model calculation were obtained, and the improved Sehitoglu model for predicting thermal fatigue life was proposed by considering the influence of average stress and temperature on material properties. By comparing the predicted results with those of the Sehitoglu model, the improved Sehitoglu model had a prediction life within three times the error band, making it more suitable for predicting the thermal fatigue life of engine cylinder heads.

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cast aluminum alloy / thermal-mechanical fatigue / life prediction / prediction model

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FU Yafei, TAO Shuai, JING Guoxi, YU Huichao, DONG Changlong, HUANG Lirong. Thermal-Mechanical Fatigue Life Prediction of Cast Aluminum Alloy Based on Improved Sehitoglu Model[J]. Vehicle Engine. 2025, 0(3): 74-80 https://doi.org/10.3969/j.issn.1001-2222.2025.03.011