An analysis of the propagation of impact elastic waves in isotropic and anisotropic materials

Abstract

In order to study the propagation law of impact elastic waves on the platform better, an experimental platform is built with isotropic and anisotropic materials to explore the propagation law of impact elastic waves on the platform. The influences of platform materials, yarn arrangement directions, comparisons of longitudinal waves and transverse waves and lamination experiments on the propagation of impact stress waves are analyzed, respectively. The results of experiments show that the transverse waves along the fiber arrangement direction have the fastest propagation speed and the longitudinal waves have the slowest propagation speed in anisotropic materials. The speed of stress waves in lamination experiment is arranged from large to small: the epoxy resin lamination, the organic glass lamination, an epoxy resin thick plate, an organic glass thick plate. Adding arranged fibers with high acoustic velocity regularly when designing impact-resistant composite materials is beneficial to the transmission and spread of elastic waves. The impact isolating materials can be whole designed as a layered structure. A certain number of 90° zigzag structures can also be arranged at the edge of the materials to enhance the effect of protection.