基于有限元数值方法的金属材料内壁缺陷超声频谱特性研究

根据金属材料内壁缺陷的特点，建立了吸收边界和自由边界相结合的模拟模型，对含有不同宽度内壁凹陷形平底槽缺陷的模型进行了超声频谱特性模拟研究。通过对波场快照、时域信号和频谱分析得到了不同尺寸平底槽对声波传播频谱特性的影响以及中心频率、带宽、半波高宽度和峰值等呈规律性变化的频域特征量。研究结果对超声检测频谱分析技术的理论和实验提供了参考。

Finite element based research on ultrasonic spectral characteristicof inner wall defect of metal materials

We construct an absorption boundary and free boundary combined model for inner wall defect of metal materials. We further simulate ultrasonic spectral characteristic of concave groove of different width inner wall. We also acquire the impact of different sized groove on spectral characteristic of ultrasonic propagation by wave field snapshots, time domain signal and spectral analysis, and such regularly variant frequency domain characteristics as central frequency, bandwidth, half width and peaks. The results provide a reference for the theory and experiment of ultrasonic testing spectral analysis.