Abstract
Based on the complex function method, the Green function method and the multi-polar coordinate method, the scattering problem of SH-wave by a semi-cylindrical debonding lining with subsurface cylindrical cavity is analyzed. Firstly, the main structure is decomposed twice and the displacement fields satisfying the boundary conditions of each region are constructed to form infinite algebraic equations. Secondly, definite integral solutions with additional unknown forces and Green function are established by the conjunction of the partitioned regions, then the dynamic stress concentration factor (DSCF) of the lining can be obtained. Finally, distribution of DSCF at the edge of the lining affected by various factors is discussed in the example. The results show that the combined action of debonding and cavity significantly increases the DSCF of interfacial debonding point and the lower half of the lining. DSCF varies with the horizontal and vertical depth of the cavity, and the appropriate increase of the radius has the effect of shock absorption.
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