铝合金高温低周疲劳裂纹扩展可靠性评估  

Reliability Evaluation of Aluminum Alloy under High Temperature Based on Low Cycle Fatigue Crack Growth

作　　者：李旭东[1] 张连峰[1] 朱武峰[1] 丁文勇[1] 

机构地区：[1]海军航空工程学院青岛校区,山东青岛266041

出　　处：《装备环境工程》2013年第5期134-138,共5页Equipment Environmental Engineering

摘　　要：通过对不同温度下6151-T6合金的研究,获得了一种基于可靠性理论的裂纹扩展速率表达式,为预测6151-T6铝合金构件的安全寿命提供依据。该表达式表明,在高温条件下,6151-T6铝合金疲劳裂纹扩展存在门槛值,而且该门槛值会随着环境温度的升高而降低。Fatigue crack growth rate of AA 6151-T6 in high temperature was tested.The fatigue crack growth rate formula was obtained based on reliability theory.The result showed that fatigue crack growth of AA 6151-T6 exists threshold value in high temperature,which decreases with temperature increasing.The purpose was to provide reference for safe life prediction of AA 6151-T6 component.The present thesis made a research on the fatigue crack growth rate of AA 6151-T6 subjected to various elevated,and proposed a reliability based formula to evaluate FCG,which provided the basis of 6151-T6 aluminum alloy component safe life prediction.The method demonstrates the existence of fatigue crack growth threshold value of 6151-T6 aluminum alloy subjected to elevated temperature,which decreases with temperature increasing.

关 键 词：铝合金 高温 可靠性 疲劳裂纹扩展 

分 类 号：TB114.3[理学—概率论与数理统计]