Multilayer sound absorbing structure durability prediction under cyclic loading

Abstract

In the framework of this work, the results of numerical durability prediction for a two-layer composite sound- absorbing structure (SAS) are presented. To predict the residual life of a single-layer and two-layer SAS with a honeycomb core, a mathematical formulation of the problem and an algorithm for solving the problem were formulated based on the finite element method using kinetic equations with a scalar damage function. The algorithm uses an approach with an explicit description of the adhesive layers destruction process. Based on the results of numerical experiments, a resource is determined and the kinetics of destruction for a single-layer and two-layer SAS with a honeycomb core was revealed. It was revealed that a single layer honeycomb core SAS has an 11.48 % longer resource before the first fatigue failure than a SAS similar in height with two honeycomb core layers.