Microscale simulation of adhesive and cohesive failure in rough interfaces

TL;DR

This paper presents a multiscale modeling approach to simulate adhesive and cohesive failure in rough interfaces, combining numerical homogenization with cohesive zone models to analyze failure mechanisms in bi-material interfaces.

Contribution

It introduces a novel computational homogenization scheme that captures local failure phenomena and derives effective interface parameters for rough bi-material interfaces.

Findings

Effective traction-separation laws are extracted for rough interfaces.

The model distinguishes between adhesive and cohesive failure modes.

Simulation results show the influence of surface roughness on failure behavior.

Abstract

Multi-material lightweight designs, e.g. the combination of aluminum with fiber-reinforced composites, are a key feature for the development of innovative and resource-efficient products. The connection properties of such bi-material interfaces are influenced by the geometric structure on different length scales. In this article a modeling strategy is presented to study the failure behavior of rough interfaces within a computational homogenization scheme. We study different local phenomena and their effects on the overall interface characteristics, e.g. the surface roughness and different local failure types as cohesive failure of the bulk material and adhesive failure of the local interface. Since there is a large separation in the length scales of the surface roughness, which is in the micrometer range, and conventional structural components, we employ a numerical homogenization approach to extract effective traction-separation laws to derive effective interface parameters. Adhesive interface failure is modeled by cohesive elements based on a traction-separation law and cohesive failure of the bulk material is described by an elastic-plastic model with progressive damage evolution.