Dynamic response of imperfect interfaces on the reflection and transmission of the waves in context of generalised thermo-elasticity.

The imperfection at the interface among two materials exists to various reasons such as thin inter phase, chemical action or interface damage. The interfaces such as mechanical, thermal and electrical significantly affect the performance of structural component that are utilized in various fields. The present mathematical study analyzes the reflection and transmission phenomenon of thermo-elastic wave being incident at the distinct types of separating interfaces in an initially stressed rotating structure with two different type half-spaces comprised of piezo-thermo-elastic (PTE) materials. The mathematical model of this study is performed under three-phase-lag model of generalised thermo-elasticity for normal stiffness interface (NSI), transverse stiffness interface (TSI), thermal conductance interface (TCI), electric imperfect interface (EII), and welded contact interface (WCI). The mathematical expressions for the amplitude and energy ratios are derived for the reflected and transmitted qP, qSV, qT and EA waves. The effects of initial stresses, rotation, phase lag and bonding parameters on amplitude ratios are performed, and energy balance law is established to validate the model. The validation of the result has been made with an existing problem for the correctness of the results. Numerical computations have been executed to demonstrate the mathematical findings by the graphical mean. [ABSTRACT FROM AUTHOR]