作者：李海洋, 高翠翠, 史慧杨, 王召巴

作者单位：中北大学信息与通信工程学院, 山西 太原 030051

关键词：拉伸疲劳;腐蚀疲劳;Rayleigh波;非线性系数

摘要：

该文采用非线性Rayleigh波检测方法，研究Q235钢拉伸疲劳损伤和腐蚀疲劳损伤的测试与评价过程；搭建非线性Rayleigh波检测系统，分别在不同拉伸频率的循环拉伸载荷和腐蚀疲劳载荷下，采集非线性声波时域信号并进行频谱分析，测量非线性系数随加载载荷周期数的变化趋势，并分析拉伸频率和腐蚀环境对非线性系数的影响。实验结果表明：Q235钢试件的超声非线性系数与疲劳周数具有一定的单调递增关系，超声非线性系数可以用来表征材料的表面疲劳损伤程度；拉伸频率对试件的疲劳损伤影响小，不同频率拉伸疲劳下，钢材的非线性系数相差不大；腐蚀环境会加剧试件的疲劳损伤程度，在腐蚀疲劳载荷下，非线性系数会增大。实验结果可为研究Q235钢拉伸疲劳损伤和腐蚀疲劳损伤的测试与评价过程提供一定的指导。

Study of nonlinear Rayleigh wave detection technique for fatigue damage in Q235 steel

LI Haiyang, GAO Cuicui, SHI Huiyang, WANG Zhaoba

School of Information and Communication Engineering, North University of China, Taiyuan 030051, China

Abstract: In this paper, the nonlinear Rayleigh wave detection method is used to study the detection and evaluation process of the tensile fatigue damage and corrosion fatigue damage of Q235 steel. The nonlinear Rayleigh wave detection system is built, under different tensile frequency cyclic tensile loading and corrosion fatigue tensile loading, the nonlinear acoustic time domain signals are collected and the frequency spectrum is analyzed, the variation trend of the nonlinear coefficients with the number of loading cycles is measured, and the influence of tensile frequency and corrosion environment on the nonlinear coefficient is analyzed. The experimental results show that the ultrasonic nonlinear coefficient and fatigue cycle of Q235 steel specimen have a certain monotonic increasing relationship, the ultrasonic nonlinear coefficient can be used to characterize the surface fatigue damage of the material; The tensile frequency has little effect on the fatigue damage of the specimen, and the nonlinear coefficients of the steel have little difference under different frequency tensile fatigue; The corrosion environment will aggravate the fatigue damage degree of the specimen, and the nonlinear coefficient will increase under the corrosive fatigue load. The experimental results can provide some guidance for studying the test and evaluation process of the tensile fatigue damage and corrosion fatigue damage of Q235 steel.

Keywords: tensile fatigue;corrosion fatigue;Rayleigh wave;nonlinear coefficient

2018, 44(4): 37-41  收稿日期: 2017-10-17;收到修改稿日期: 2017-12-29

基金项目: 国家自然基金项目（11604304）；山西省高等学校科技创新项目（201657）；山西省重点研发计划（201603D121006-1）；山西省青年面上基金项目（201701D221127）

作者简介: 李海洋(1987-),女,黑龙江佳木斯市人,讲师,博士,主要从事超声无损检测、非线性声学研究。

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