基于元胞自动机法的AA7075-T651铝合金在力-化学交互作用下腐蚀损伤特征演化规律研究  

Evolution of Corrosion Damage Characteristics of AA7075-T651 Al-alloy Under Mechanical-chemical Interaction Based on Cellular Automata Method

作　　者：翁硕 孟超 罗陵华 袁奕雯[5] 赵礼辉[1,2,3] 冯金芝 WENG Shuo;MENG Chao;LUO Linghua;YUAN Yiwen;ZHAO Lihui;FENG Jinzhi(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Key Laboratory of Strength and Reliability Evaluation of Auto Mechanical Components for Mechanical Industry,Shanghai 200093,China;Shanghai Public Technology Platform for Reliability Evaluation of New Energy Vehicles,Shanghai 200093,China;Research Institute of China State Shipbuilding Corporation,Shanghai 201108,China;Shanghai Institute of Special Equipment Supervision and Inspection Technology,Shanghai 200062,China)

机构地区：[1]上海理工大学机械工程学院,上海200093 [2]机械工业汽车机械零部件强度与可靠性评价重点实验室,上海200093 [3]上海市新能源汽车可靠性评价公共技术平台,上海200093 [4]中国船舶集团公司第七一一研究所,上海201108 [5]上海市特种设备监督检验技术研究院,上海200062

出　　处：《中国腐蚀与防护学报》2024年第6期1507-1517,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52005336);国家市场监管总局创新人才计划(QNBJ202318)。

摘　　要：为合理阐明力-化学交互作用下AA7075-T651铝合金腐蚀损伤特征的演化规律,本研究采用元胞自动机法和力学数值仿真软件联合方法,模拟了铝合金在不同载荷水平下的腐蚀损伤演化过程,系统地探究了机械应力对材料腐蚀生长速率及形貌特征演化的影响。研究结果显示,相较于无外加载荷作用下的材料腐蚀,力-化学耦合作用下材料腐蚀损失的元胞数量、最大腐蚀深度或宽度均明显增大,且从腐蚀损伤特征的最大腐蚀深度/宽度比值随着载荷水平的增加逐渐上升可以看出,拉伸应力造成腐蚀坑在纵向上呈现出更快的生长趋势,进而造成应力集中系数增加,使得腐蚀损伤特征底部由弹性变形转变为塑性变形,最终加速了金属的腐蚀进程。The evolution of corrosion damage characteristics of AA7075-T651 Al-alloy under combined force-chemical interaction was clarified via a combination of cellular automaton method and mechanical numerical simulation software,aiming to simulate the evolution process of corrosion damage of Al-alloy under different load levels,and to revealing the effect of mechanical stress on the variation of corrosion growth rate and morphological characteristics evolution of the Al-alloy as well.The results show that compared with the corrosion of Al-alloy without external load,the number of cells lost due to the corrosion and the maximum corrosion depth or width under the action of force-chemical coupling are significantly increased,while the maximum ratio of corrosion depth to width of the corrosion damage characteristics are significantly increased.It can be seen that the ratio of depth to width gradually increases with the increase of load level.It can be seen that the tensile stress causes the corrosion pit to show a faster growth trend in the longitudinal direction,which in turn causes the stress concentration coefficient to increase,causing the bottom of the corrosion damage characteristic to change from elastic deformation to plastic deformation,ultimately accelerating the corrosion process of the Al-alloy.

关 键 词：元胞自动机 有限元分析 AA7075-T651铝合金 腐蚀损伤 

分 类 号：TG156[金属学及工艺—热处理]