Numerical simulation of ultrasonic testing for non-metallic inclusions in metallic materials
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摘要: 在金屬材料內部夾雜物的超聲檢測中,如何通過檢測獲得的回波信號辨識夾雜物的屬性和位置,一直是其重點和難點問題.通過建立包含夾雜物缺陷的二維金屬板模型,采用有限元數值模擬的方法,對材料內部超聲波場進行計算,獲得了兩種最典型的夾雜物Al2O3和TiN,以及二者在材料內部不同深度時的超聲回波信號.研究了夾雜物類型和夾雜物深度對超聲回波時域波形以及對界面波、夾雜物缺陷回波和底面回波頻譜分布的影響規律.Abstract: In the area of internal inclusion detection using ultrasonic,identifying the location and type of internal inclusions using the collected back echo signals has always been a difficult problem. A two-dimensional metallic plate containing inclusions is established. Ultrasonic wave fields inside this material are calculated by the finite element method. Echo waves for two typical inclusions of Al2O3 and TiN and for these inclusions with different depths are obtained. The influences of the type and depth of inclusions on the time-domain and the spectral distribution of interfacial waves,echo waves of inclusions and bottom echo waves are analyzed especially.
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