SH波对有部分脱胶衬砌的圆形孔洞的散射

DIFFRACTION OF SH-WAVES BY A CIRCULAR CAVITY WITH A PARIIALLY DEBONDED LINER

本文研究了圆形孔洞内衬砌与孔洞部分脱胶时对ＳＨ波的散射．将脱胶区看作表面不相接触的弧形界面裂纹，利用波函数展开法，并引入裂纹面的位错密度函数，将问题归结为一组奇异积分方程．通过数值计算获得了动应力强度因子（ＤＳＩＦ）和远场位移及散射截面（ＳＣＳ）．结果显示：由于脱胶，ＤＳＩＦ和ＳＣＳ在较低的频率上发生共振．

This paper deals with the problem of diffraction of SH-waves by a circularcavity with a partially debonded liner. The debonding resions are modeled as arc-shapedinterface cracks. Using the wave function expansion method and introducing the dislocationdensity functions as unknown variables, the problem is reduced to a set of singular inte-gral equations which are solved numerically to obtain the dynamic stress intensity factors(DSIF_s), far-field displacements and scattering cross-section(SCS). The results show thatDSIF and SCS have resonances at lower frequencies due to debondings.