首页|基于多物理场耦合的Q345钢应力腐蚀行为研究

基于多物理场耦合的Q345钢应力腐蚀行为研究

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海上风力机组的支撑结构和相应的变压器平台极易受到腐蚀,腐蚀缺陷会导致应力集中,从而严重影响风机设备的使用寿命.以Q345钢为研究对象,采用COMSOL多物理场仿真软件建立一种Q345钢表面腐蚀缺陷生长预测的有限元模型,模拟研究海洋环境中Q345钢的应力腐蚀行为.通过电化学腐蚀试验得出Q345钢的Tafel关系,应用多物理场耦合计算应力对腐蚀缺陷处电化学腐蚀的影响,结合Faraday定律开展腐蚀缺陷的生长预测.结果表明:随着拉伸应变和缺陷深度的增加,缺陷处的应力也随着增加,加速了缺陷处的失效;当应力在缺陷处引起塑性变形时,局部腐蚀活性显著增强;在缺陷处的力学和电化学效应改变了缺陷中心的应力分布,增强了缺陷中心腐蚀速率.
Stress Corrosion Simulation of Q345 Steel Based on Multiphysics Simulation Coupling
Offshore wind turbine support structures and the related transformer platform are particularly corrosive-prone,and corrosion flaws can result in stress concentration,which adversely affects the wind turbine equipment's service life.Using Q345 steel as the research object,a finite element model for the growth prediction of surface corrosion defects in Q345 steel was established using COMSOL coupling Multi-physics simulation software,and the stress corrosion behavior of Q345 steel in different states in the marine environment was simulated.The Tafel relation of Q345 steel was determined using an electrochemical corrosion test,the impact of stress on electrochemical corrosion at corrosion defects was predicted using multi-physics coupling,and corrosion defect increase prediction was performed in conjunction with Faraday's law.The results indicate that as the tensile strain and defect depth increase,the stress at the defect is increased,and the failure at the defect is accelerated.When stress causes plastic deformation at the defect site,local corrosion activity is significantly enhanced.The mechanical and electrochemical effects at the defect site alter the stress distribution at the defect center,en-hancing the corrosion rate at the defect center.

Q345 steelelectrochemical corrosionoffshore wind powerdefectmulti-physics coupling

裴文乐、裴兵兵、王建梅、帅美荣、谢壮壮

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太原科技大学重型机械教育部工程研究中心,山西太原 030024

Q345钢 电化学腐蚀 海上风电 缺陷 多物理场耦合

山西省青年基金项目校级博士科研启动基金项目来晋优秀博士基金项目辽宁省航发材料摩擦学重点实验室开放基金项目山西省高等学校科技创新项目山西省高等学校科技创新项目

2022030212123162022203020222097LKLAMTF2023052022L3092021L329

2024

10.3969/j.issn.0254-0150.2024.02.005

润滑与密封
中国机械工程学会 广州机械科学研究院有限公司

润滑与密封

CSTPCD北大核心
影响因子：0.478
ISSN：0254-0150
年,卷(期)：2024.49(2)
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