Coupling resonance mechanism of interfacial stratification of sandwich plate structures excited by SH waves

Abstract

For interfacial stratification mechanism of sandwich plate structures, the forced propagation solution of interface shear stress excited by SH waves is derived by global matrix methods and integral transformation methods. The necessary condition of interfacial shear delamination excited by alternating stress is analyzed with the interface fatigue failure theory. The exact value of forced propagation solution is calculated by adaptive Gauss–Kronrod quadrature numerical integration methods, which is verified via finite element methods. The coupling resonance mechanism of interface shear stratification is revealed by the forced vibration solution and the mass-spring model. The effects of excitation frequency, structural parameters, accretion, and matrix materials on the interfacial shear delamination are analyzed and discussed by practical cases of vibration de-accretion. For interface shear stratification of sandwich structures, the optimal excitation frequency as well as substrate thickness and accretion thickness is the value at coupling resonance, around which the interfacial shear stratification interval is formed by the interface fatigue failure criteria. In the stratification or/and antistratification design excited by vibrations, the excitation source and structure could be optimized by the method. Therefore, the results have important theoretical value for the extension and application of vibration stratification or/and antistratification technology.

Coupled Resonance Mechanism of Interface Stratification of Thin Coating Structures Excited by Horizontal Shear Waves

“…Then, it is proved by the finite element method that the interfacial shear stress directly leads to interfacial delamination [32][33][34][35][36][37][38][39][40][41][42][43][44]. Furthermore, it is found that the interfacial shear stress of double layer structures, sandwich structures, and thin internal layer structures excited by the horizontal shear wave has coupling resonance characteristics [45][46][47]. Coating structures have widely existed in the field of industrial technology [48].…”