金属材料腐蚀疲劳的近场动力学模拟  

Peridynamic Modeling of Corrosion Fatigue in Metallic Materials

作　　者：潘雨崧 彭旭龙[2] 陈子光 Yusong Pan;Xulong Peng;Ziguang Chen(Department of Engineering Mechanics,School of Aerospace Engineering,Huazhong University of Science and Technology,Wuhan,430074;School of Civil Engineering,Changsha University of Science&Technology,Changsha,410114;Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment,1037 Luoyu Road,Wuhan,430074)

机构地区：[1]华中科技大学航空航天学院工程力学系,武汉430074 [2]长沙理工大学土木工程学院,长沙410114 [3]工程结构分析与安全评定湖北省重点实验室,武汉430074

出　　处：《固体力学学报》2024年第3期326-340,共15页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金面上项目(12372208);中央高校基本科研业务费专项资金(2021GCRC021)资助。

摘　　要：疲劳破坏是工程中最常见的一种结构失效形式.当工程结构在腐蚀环境中服役时,腐蚀环境和交变载荷的共同影响会显著降低结构的疲劳性能.本文将近场动力学疲劳损伤与腐蚀损伤统一,考虑腐蚀疲劳演化中结构损伤为腐蚀损伤和疲劳损伤的线性叠加;结合近场动力学疲劳模型与应力腐蚀模型,建立近场动力学腐蚀疲劳模型.该模型同时考虑了结构变形对腐蚀速率的影响和腐蚀前沿产物与几何形貌的非均质性.应用该模型模拟研究了不锈钢紧凑拉伸试件中的腐蚀疲劳裂纹萌生、裂纹扩展阶段.数值结果表明本文发展的近场动力学腐蚀疲劳模型可以描述腐蚀疲劳的损伤演化过程,引入的力学损伤与腐蚀损伤相互作用耦合模型以及应力腐蚀关系揭示了阳极溶解对试件疲劳寿命的影响以及疲劳寿命的加载频率敏感性.Fatigue failure is the most common form of failure in engineering.Under the interaction between corrosive environments and fatigue load,the fatigue performance of structures will be significantly reduced.It often consumes a lot of time and economic costs to evaluate the fatigue properties of materials or structures by corrosion fatigue experiments.Therefore,establishing a reliable numerical prediction model for scientific research and engineering design is significant.In this paper,we develop a peridynamic corrosion fatigue model,which combines the peridynamic fatigue crack model and the peridynamic stress-corrosion model,according to the superposition model of corrosion fatigue.In this model,corrosion fatigue damage is a linear superposition of corrosion damage and fatigue damage,and the coupling between stress and corrosion is considered.We simulate the corrosion fatigue failure process(including crack initiation and crack growth phase)of stainless steel compact tensile specimens.The numerical results show that the peridynamic corrosion fatigue model can describe the damage evolution process of corrosion fatigue,and the introduced mechano-chemical damage model captures the fatigue life reduction and loading frequency sensitivity of specimens.

关 键 词：近场动力学 腐蚀疲劳 力学损伤 腐蚀损伤 应力腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理] O346.2[金属学及工艺—金属学]