基于改进Sehitoglu模型的铸铝合金热机疲劳寿命预测

doi:10.3969/j.issn.1001-2222.2025.03.011

车用发动机 ›› 2025, Vol. 0 ›› Issue (3) : 74-80. DOI: 10.3969/j.issn.1001-2222.2025.03.011

付亚飞^1,2，陶帅^1,2，景国玺^1,2，于会超³，董长龙³，黄立荣³

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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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摘要

为解决A356-T6铸铝合金气缸盖热机疲劳寿命预测问题，开展了发动机气缸盖本体取样下的拉伸性能测试、低周疲劳测试、蠕变测试和热机疲劳试验，得到了Sehitoglu模型计算中所需的材料参数，并通过考虑平均应力和温度对材料性能的影响，提出了基于改进Sehitoglu模型的热机疲劳寿命预测模型。通过和Sehitoglu模型预测结果进行对比，本研究提出的改进Sehitoglu模型预测寿命均在三倍误差带内，更适用于发动机气缸盖的热机疲劳寿命预测。

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.

导出引用

付亚飞, 陶帅, 景国玺, 于会超, 董长龙, 黄立荣. 基于改进Sehitoglu模型的铸铝合金热机疲劳寿命预测[J]. 车用发动机. 2025, 0(3): 74-80 https://doi.org/10.3969/j.issn.1001-2222.2025.03.011

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