航空高强度LY12CZ铝合金腐蚀剩余强度预测  

Prediction of High-strength Aero LY12CZ Aluminum Alloy Residual Strength with Corrosion Damage

作　　者：李旭东[1] 穆志韬[1] 刘治国[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6期1-4,76,共5页Equipment Environmental Engineering

基　　金：国家自然科学基金项目(11272173)~~

摘　　要：目的研究LY12CZ铝合金在腐蚀环境下的强度退化规律。方法按ASTM标准对常温下的LY12CZ铝合金进行预腐蚀,测量腐蚀坑的深度,统计腐蚀坑数目,进行数理统计,获得其几何尺寸的分布。利用MTS 880试验机进行静拉伸试验。建立腐蚀坑的物理模型,基于腐蚀坑平均特征参数和最大特征参数,利用AFGROW软件进行剩余强度预测。结果剩余强度随着腐蚀损伤加深而逐步减小。结论与实验值对比的结果证明,该方法具有应用价值。Objective To study the degradation behavior of LY12CZ aluminum alloy with corrosion damage. Methods In order to create pits on specimen surface, specimens of LY12CZ aluminum alloy were exposed in corrosive solution according ASTM standard, the number and the geometric size distribution of the pits were statistical analyzed. Results Single direction tensile tests were conducted on corroded specimen, which proved that residual strength decreases with the increasing of corrosion damage. The thesis proposed an AFGROW based method to predict the residual strength based on the average pit parameters and maximum pit parameters. Conclusion The proposed method is applicable for engineering practice.

关 键 词：腐蚀坑 腐蚀损伤 剩余强度 

分 类 号：TG174.3[金属学及工艺—金属表面处理]