Abstract

Anisotropic laminated materials such as composite structures is an important class of materials intensively used in high-end industrial contexts. Analyzing ultrasonic testing experiments of these materials through numerical modeling remains an important task, especially in the presence of complex phenomena such as visco-elastic behavior and structural noise emanating from intermediate epoxy layers. This communication is dedicated to recent advances aiming at representing these phenomena into a finite element solver in transient regime. Concerning the visco-elasticity we consider the standard models of Kelvin-Voigt, Maxwell and Zener. After recapping their corresponding attenuation behaviors, we propose an efficient calibration strategy for these models, valid for 2D and 3D anisotropic solids. We analyze relevant time discretization strategies for each model, leading to an efficient explicit numerical scheme. Concerning the structural noise, we propose to incorporate the effect of epoxy layers using spring-mass transmission conditions between plies. These transmission conditions are adequately embedded in the finite element formulation using the mortar element method. Illustrations of our combined numerical tools are given in a 2D context.

How to Cite:

Imperiale, A. ., Leymarie, N. . & Demaldent, E. ., (2019) “Efficient incorporation of visco-elastic behaviors and thin intermediate layers in transient finite element modeling of laminate structures”, Review of Progress in Quantitative Nondestructive Evaluation .