Nonlinear surface wave detection of stress corrosion micro-cracks in austenitic stainless steel
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摘要: 利用COMSOL有限元模拟软件构建非线性表面波检测奥氏体不锈钢应力腐蚀微裂纹的模型，采用顺序耦合与直接耦合两种方式，分别实现应力场与声场的耦合。COMSOL软件在创建非线性表面波检测应力腐蚀微裂纹的模拟领域有很强的可行性与优越性，很大程度地简化了建模步骤，缩短了模拟运算时间。利用最优模型进一步讨论应力的大小以及微裂纹尺寸对非线性表面波传播特性的影响，并结合试验进行验证。结果表明：当微裂纹尺寸固定时，随着微裂纹边界处应力的增加，非线性响应降低；在恒应力作用下，非线性系数与微裂纹的深度呈正相关，与微裂纹宽度呈负相关；试验结果与模拟结果具有良好的一致性。Abstract: COMSOL finite element software was used to establish the model of the austenitic stainless steel micro-crack induced by stress corrosion through using the nonlinear surface wave detection. Two methods of sequential coupling and direct coupling were used to realize the coupling of stress field and acoustic field respectively. COMSOL software has strong feasibility and superiority in the simulation field of creating nonlinear surface wave detect stress corrosion micro-crack, which greatly reduces the difficulty of modeling and shortens the simulation operation time. The best parameter combination was used to research the detection of metal surface micro-cracks, and the influence of stress size, micro-crack size on the propagation characteristics of nonlinear surface waves was discussed, and the experimental verification was performed. The results show that: when the size of the micro-crack is fixed, the nonlinear response decreases with the increase of the stress applied at the boundary of the micro crack; under constant stress, the nonlinear coefficient is positively related to the depth of the micro crack, and is negatively related to the width of the micro crack. The experimental results and the simulation results are in good agreement.
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Keywords:
- nonlinear ultrasonic testing /
- stress corrosion /
- micro-crack /
- COMSOL software
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