腐蚀疲劳裂纹的虚拟扩展方法研究  

VIRTUAL CORROSION FATIGUE CRACK PROPAGATION TESTS

作　　者：张有宏[1] 吕国志[2] 常新龙[1] 王慧[2] 陈跃良[3] 

机构地区：[1]第二炮兵工程学院,西安710025 [2]西北工业大学航空学院,西安710072 [3]海军航空工程学院青岛分院,青岛266041

出　　处：《腐蚀科学与防护技术》2008年第4期247-249,共3页Corrosion Science and Protection Technology

基　　金：黄玉珊先生基金部分资助

摘　　要：以紧固孔结构件腐蚀疲劳试验为基础,研究了腐蚀疲劳裂纹虚拟扩展方法即随机过程和AFGROW模拟方法.以试验数据拟合得到的Paris公式为基础,在随机过程方法中考虑了正态随机过程和对数正态随机过程,得到裂纹长度和循环数之间的模拟曲线,给出指定循环数下裂纹长度的概率模型并和实验结果进行了比较.利用AF-GROW对腐蚀疲劳裂纹扩展进行了模拟,裂纹扩展模拟曲线与实验值符合较好.The fatigue crack propagation behavior of LY12CZ aluminum alloy fastener with a central hole has been investigated in 3.5% NaCl solution. Based on the experimental results,the virtual corrosion fatigue crack propagation tests were proposed. Two virtual crack propagation methods of stochastic processes and AFGROW simulation were discussed. The parameters of Paris equation were obtained by numerical fitting method. The normal process and lognormal process were considered for the stochastic process method. The stochastic crack length distributions and the probabilistic model of crack length distributions at given cycles were presented. Using the AFGROW software, the virtual simulation was carried out to analyze corrosion fatigue crack growth behavior. The predicted curves were in good agreement with experimental results.

关 键 词：虚拟裂纹扩展 腐蚀疲劳 随机过程 AFGROW 铝合金 

分 类 号：V216.5[航空宇航科学与技术—航空宇航推进理论与工程] O211[理学—概率论与数理统计]