摘要
建立了无限长板的具有吸收边界的二维平面应变有限元模型,在研究了脉冲超声波在无限长板中传播的基础上,对板中平行于表面的裂纹、与表面成45°的斜裂纹和四分之一圆周弧形裂纹三种情况的脉冲超声波散射进行了重点研究。通过对纵横波的分离和在全波场中对散射波的分离,清晰地显示了裂纹对脉冲超声波的散射和复杂的模式转换。模拟结果以波场快照和A扫描曲线形式给出。
A two-dimensional plain strain finite element model of infinite plate is developed to investigate the ultrasonic wave propagation and scattering on three kinds of cracks： parallel to the surface, 45° oblique angle to the surface, and quarter-circle. In order to show the scattering and complex mode-conversion clearly, the total field is decomposed into longitudinal and transverse parts and the scattered field is obtained by subtracting incident wave from the total field. The results are presented in the form of snapshots and A-scan plots.
出处
《无损检测》
北大核心
2007年第1期27-31,55,共6页
Nondestructive Testing
关键词
超声检测
裂纹
散射
有限元模拟
Ultrasonic testing
Cracks
Scattering
Finite element modeling
