| 尹 昱,陈振华,肖 峰,卢 超.不锈钢疲劳微损伤的非线性超声检测方法[J].电子测量与仪器学报,2020,34(1):68-73 |
| 不锈钢疲劳微损伤的非线性超声检测方法 |
| Nonlinear ultrasonic testing method for fatigue micro damage of stainless steel |
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| DOI： |
| 中文关键词: 非线性超声 疲劳微损伤 相对非线性系数 激励电压 |
| 英文关键词:nonlinear ultrasonic testing micro fatigue damage relative nonlinear coefficient excitation voltage |
| 基金项目:国家自然科学基金（11664027）、声场声信息国家重点实验室开放课题（SKLA201811）资助项目 |
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| 中文摘要: |
| 针对常规超声技术无法检测微小疲劳损伤的问题&提出基于有限幅度法的疲劳损伤非线性超声检测方法’ 设计检测平
台提供稳定可调的探头声耦合性能&提高非线性超声检测信号的稳定性(在各种激励电压下提取微损伤区的相对非线性系数&
结合金相测量方法深入分析非线性系数对微小疲劳损伤的检测能力及激励电压对检测能力的影响’ 结果显示&相对非线性系
数可定量表征金相实验无法观察的微疲劳损伤&激励电压可影响检测效率和检测分辨率&是非线性超声有限幅度法的关键检测
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| 英文摘要: |
| A nonlinear ultrasonic testing method based on the finite amplitude method is proposed for testing micro fatigue damage, which is hard to be distinguished by the traditional ultrasonic testing. First, the Detection platform which can be used to adjust probe’s acoustic coupling performance is designed to keep the stability of the nonlinear ultrasonic detection signal. Second, the relative nonlinear coefficient of the micro damage zone is extracted under various excitation voltages to investigate the influences of the excitation voltage on the testing effect. Finally, the testing abilities of the nonlinear ultrasonic testing on the micro damage are discussed combining with the metallographic measurement. The results indicate that the relative nonlinear coefficient can effectively characterize the micro fatigue damage, and the excitation voltage is the key detection parameter of the nonlinear ultrasonic finite amplitude method, which decides the detection efficiency and detection resolution. |
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