摘要
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.
出处
《力学学报》
EI
CSCD
北大核心
1994年第4期462-469,共8页
Chinese Journal of Theoretical and Applied Mechanics
关键词
弹性波
散射
脱胶
孔洞
衬砌
diffraction of elastic wave, arc-shaped interface crack, debonding wavefunction, singular integral equation, dynamic stress intensity factor, scattering cross-section