考察多层圆筒界面层对周向导波传播的影响

Effects of interface in multi-layered thick-walled hollow cylinder on guided circumferential wave propagation

首次对界面层存在时周向导波在多层圆筒中传播问题进行理论推导,并对理论结果进行相应的数值计算。结果表明:频散现象和模态干涉现象在多层圆筒中传播时也同样出现;通过与理想的固结连接和理想的光滑连接类比发现,界面层存在时,对频散曲线和合成位移都有明显的影响,这与界面材料的Lamé常数和界面层的厚度有关。因此,工程上要根据实际需要的理想边界状况,选用合适的材料作为界面层。

The guided circumferential wave propagation with a interface in multi-layered thick-walled ho- llow cylinder was firstly investigated theoretically and the numerical calculation was completed. Results showed that dispersion phenomenon and mode interactions occurred in multi-layered thick-walled hollow cylinder. Comparing with those cylinders with ideal sliding or ideal welded interface, the dispersion curves and the resultant displacements were distinctly influenced by the existence of interface in multi-layered cylinder, thus it is related to Lam6 constant and the thickness of the interfaces. It was suggested that the material of interfaces should be selected according to practical needs.