| 超声波与不同方向微裂纹的非线性相互作用数值仿真 |
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| 引用本文： | 焦敬品,李海平,吕洪涛,何存富,吴斌.超声波与不同方向微裂纹的非线性相互作用数值仿真[J].北京工业大学学报,2018,44(5):708-715. |
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| 作者姓名： | 焦敬品 李海平 吕洪涛 何存富 吴斌 |
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| 作者单位： | 北京工业大学机械工程与应用电子技术学院,北京,100124;北京工业大学机械工程与应用电子技术学院,北京,100124;北京工业大学机械工程与应用电子技术学院,北京,100124;北京工业大学机械工程与应用电子技术学院,北京,100124;北京工业大学机械工程与应用电子技术学院,北京,100124 |
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| 基金项目： | 国家重点研发计划资助项目(2016YFF0203002)，国家自然科学基金资助项目(11572010 |
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| 摘 要： | 针对金属结构中微裂纹方向检测问题,发展了一种基于谐波非线性的微裂纹方向测量方法.对结构中微裂纹与超声波非线性相互作用进行数值仿真研究,分析了裂纹方向对超声波散射场的影响.仿真结果表明,反射纵波的二次谐波、三次谐波传播方向的增加量约为裂纹方向变化的2倍,而透射纵波的谐波分量的传播方向几乎保持不变.将以上规律应用于任意微裂纹方向的测量,检测结果表明,该方法可以实现微裂纹方向测量,且误差较小.
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| 关 键 词： | 超声非线性 谐波 微裂纹 无损检测 |
Numerical Simulation of Nonlinear Interaction Between Ultrasonic and Micro-cracks in Different Directions |
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| JIAO Jingpin,LI Haiping,Lü Hongtao,HE Cunfu,WU Bin.Numerical Simulation of Nonlinear Interaction Between Ultrasonic and Micro-cracks in Different Directions[J].Journal of Beijing Polytechnic University,2018,44(5):708-715. |
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| Authors: | JIAO Jingpin LI Haiping Lü Hongtao HE Cunfu WU Bin |
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| Abstract: | To solve the problem of micro-crack direction detection in metal structures, a method of measuring micro-crack direction based on harmonic nonlinearity was developed. The influence of the crack direction on the ultrasonic scattering field was analyzed by numerical simulations of the nonlinear interaction between the micro-crack and the ultrasonic wave. The simulation results show that the increase of the second harmonic and the third harmonic propagation direction of the reflected longitudinal wave is about twice that of the crack direction, and the propagation direction of the harmonic component of the transmitted longitudinal wave is almost unchanged. The above results were applied to the measurement of arbitrary micro-crack direction. The results show that the method can measure the micro-crack direction and the error is small. |
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