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在金属材料内部夹杂物的超声检测中,如何通过检测获得的回波信号辨识夹杂物的属性和位置,一直是其重点和难点问题.通过建立包含夹杂物缺陷的二维金属板模型,采用有限元数值模拟的方法,对材料内部超声波场进行计算,获得了两种最典型的夹杂物Al2O3和Ti N,以及二者在材料内部不同深度时的超声回波信号.研究了夹杂物类型和夹杂物深度对超声回波时域波形以及对界面波、夹杂物缺陷回波和底面回波频谱分布的影响规律.
In the ultrasonic testing of inclusions inside metal materials, how to recognize the property and position of inclusions by detecting the echo signals has always been its key and difficult issue.By establishing a two-dimensional metal plate model containing inclusions defects, Elemental numerical simulation of the ultrasonic field inside the material to obtain the two most typical inclusions Al2O3 and TiN, as well as the two materials at different depths within the ultrasonic echo signal.The type of inclusions and inclusions The influence of object depth on the time-domain waveform of ultrasonic echo and its influence on the spectral distribution of interface wave, inclusions echo and bottom echo.