文章摘要
李海洋,史慧扬,王召巴.利用非线性表面波评价材料疲劳损伤[J].声学技术,2019,38(3):296~300
利用非线性表面波评价材料疲劳损伤
A method of detecting corrosion fatigue damage based on nonlinear Rayleigh surface wave
投稿时间:2018-01-23  修订日期:2018-03-26
DOI:10.16300/j.cnki.1000-3630.2019.03.010
中文关键词: 腐蚀疲劳|Rayleigh表面波|非线性系数
英文关键词: corrosion fatigue|Rayleigh surface wave|nonlinear parameter
基金项目:国家自然科学基金资助项目(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)
作者单位E-mail
李海洋 中北大学信息与通信工程学院, 山西太原 030051  
史慧扬 中北大学信息与通信工程学院, 山西太原 030051  
王召巴 中北大学信息与通信工程学院, 山西太原 030051 wangzb@nuc.edu.cn 
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中文摘要:
      采用非线性Rayleigh表面波检测方法,实现了不同疲劳阶段下钢试样拉伸和腐蚀疲劳损伤的测试与评价;基于楔块\换能器激发与接收声波方式,搭建非线性Rayleigh波检测系统,测量了不同激励水平下基波幅值平方与二次谐波幅值间的线性关系以及Rayleigh表面波二次谐波的累积效应;分别在拉伸载荷和腐蚀疲劳载荷下,采集非线性时域信号并进行频谱分析,测量声学非线性系数在不同疲劳阶段下变化趋势,并分析不同疲劳载荷对钢试样声学非线性系数的影响。实验结果表明:超声非线性系数与疲劳周期数呈单调递增关系,可以用声学非线性系数来表征材料的表面疲劳损伤程度;相比较周期性拉伸疲劳损伤,腐蚀疲劳试样的声学非线性系数会增大,是由于腐蚀环境会加重实验中钢试样的疲劳损伤程度。研究成果可为疲劳损伤无损检测与评价提供一定的指导意义。
英文摘要:
      Nonlinear detection method using Rayleigh surface wave is applied to detecting and evaluating tensile and corrosion fatigue damage of steel specimens at different fatigue stages in this work. Based on wedge/transducer method, a nonlinear detection system is built to realize excitation and reception of Rayleigh surface wave, and a linear relationship between the square of fundamental wave amplitude and the amplitude of second harmonic at different excitation levels, as well as the cumulative effect of second harmonic are measured. The curves of acoustic nonlinearity parameter at various fatigue stages are measured, and the influence of different fatigue loads on the acoustic nonlinearity parameter of steel specimens is analyzed. According to experimental data it can be seen that ultrasonic nonlinearity parameter increases monotonously with fatigue cycles, which can be used to characterize surface fatigue damage of materials. Corrosion fatigue specimen has a stronger nonlinear effect than periodic tensile fatigue specimen, which illustrates that the corrosion environment would aggravate damage of steel specimen. So, the nonlinear detection method using Rayleigh surface wave may be feasible for the non-destructive detection and evaluation of fatigue damage.
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