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

doi:10.11902/1005.4537.2024.111

中国腐蚀与防护学报

2024, Vol. 44

Issue (6): 1507-1517 CSTR: 32134.14.1005.4537.2024.111 DOI: 10.11902/1005.4537.2024.111

研究报告

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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

翁硕¹^,²^,³(

), 孟超¹, 罗陵华⁴, 袁奕雯⁵, 赵礼辉¹^,²^,³, 冯金芝¹^,²^,³

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

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

WENG Shuo¹^,²^,³(

), MENG Chao¹, LUO Linghua⁴, YUAN Yiwen⁵, ZHAO Lihui¹^,²^,³, FENG Jinzhi¹^,²^,³

1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2. Key Laboratory of Strength and Reliability Evaluation of Auto Mechanical Components for Mechanical Industry, Shanghai 200093, China
3. Shanghai Public Technology Platform for Reliability Evaluation of New Energy Vehicles, Shanghai 200093, China
4. Research Institute of China State Shipbuilding Corporation, Shanghai 201108, China
5. Shanghai Institute of Special Equipment Supervision and Inspection Technology, Shanghai 200062, China

引用本文:

翁硕, 孟超, 罗陵华, 袁奕雯, 赵礼辉, 冯金芝. 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[J]. 中国腐蚀与防护学报, 2024, 44(6): 1507-1517.
Shuo WENG, Chao MENG, Linghua LUO, Yiwen YUAN, Lihui ZHAO, Jinzhi FENG. Evolution of Corrosion Damage Characteristics of AA7075-T651 Al-alloy Under Mechanical-chemical Interaction Based on Cellular Automata Method[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1507-1517.

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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。

关键词 ：元胞自动机, 有限元分析, AA7075-T651铝合金, 腐蚀损伤

Abstract：

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.

Key words： cellular automata finite element analysis AA7075-T651 Al-alloy corrosion damage

收稿日期: 2024-04-02 32134.14.1005.4537.2024.111

ZTFLH:

TG156

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

通讯作者: 翁硕，E-mail：wengshuo@usst.edu.cn，研究方向为结构与材料可靠性评价及设计

Corresponding author: WENG Shuo，E-mail: wengshuo@usst.edu.cn

作者简介: 翁硕，男，1988年生，博士，副教授

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.111 或 https://www.jcscp.org/CN/Y2024/V44/I6/1507

图1 AA7075-T651铝合金点蚀示意图

图2 元胞自动机的Von Neumann模型

表1 元胞自动机模型各元胞的类型

图3 元胞自动机空间模型示意图

图4 元胞自动机腐蚀演化规律示意图

表2 元胞自动机模型参数概率

图5 元胞自动机有限元模型结构示意图

图6 腐蚀坑截面形状图[20]

图7 CA模型不同腐蚀坑模拟截面图

图8 CA模型腐蚀坑形貌变化图

图9 2024和7B04铝合金在24~192 h内的腐蚀坑截面图[23]

图10 不同腐蚀概率下腐蚀元胞数目变化对比图

图11 不同沉淀系数下腐蚀元胞数目变化对比图

图12 相同应力下不同模拟时间步数形貌对比图

图13 相同模拟时间步数下不同应力水平腐蚀形貌对比图

图14 CA模型中应力变化对腐蚀元胞数及深度、宽度、深宽比的影响

图15 模拟时间步数为200, 应力为200和500 MPa下腐蚀坑应力和应变图

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