两级复合载荷下铝合金疲劳寿命预估  

Fatigue Life Prediction of Aluminum Alloy under Two-stage Combined Cycle Loading

作　　者：石欣桐 肖迎春[1] 黄博[1] SHI Xin-tong;XIAO Ying-chun;HUANG Bo(Aircraft Strength Research Institute of China,Xi’a n 710065,China)

机构地区：[1]中国飞机强度研究所,西安710065

出　　处：《科学技术与工程》2018年第17期320-323,共4页Science Technology and Engineering

摘　　要：高低周或低高周复合载荷作用下的疲劳破坏广泛存在于飞机发动机等结构中。基于多机制损伤耦合模型,分别建立了高低周、低高周两级加载下金属疲劳寿命预估模型。通过LY12CZ铝合金两级加载疲劳试验对提出的低高周复合疲劳寿命预估模型进行了验证,并将其与Miner线性模型进行了对比。结果表明:提出的低高周复合疲劳寿命预估模型预测结果更为准确。Fatigue failure under two-stage combined cycle loading is widely found in aircraft engines and other structures. Based on multi-mechanism damage coupling model,life prediction models of metal fatigue life under two-stage combined loading were established. The proposed model for low and high combined cycle fatigue was verified by experimental data on LY12CZ aluminum alloy under combined cycle loading. Comparison of the proposed model with the model based on Miner theory was also made. The results showed that the predicted life of the proposed model was better correlated with experimental data.

关 键 词：多机制损伤耦合模型 两级复合载荷 低高周复合疲劳 疲劳寿命预估 

分 类 号：V214.34[航空宇航科学与技术—航空宇航推进理论与工程]