FEM simulations for the micro-cracked interfaces

Abstract

This paper delves into the intricate world of micro-cracks, particularly those nestled within the interface of two materials. Micro-cracks are indeed pervasive, lurking within solids and components, and they pose a significant threat to structural integrity. What makes this study unique is its focus on zooming in on a single micro-crack along the interface, unraveling the complex interplay between crack development, growth, and their impact on the joint's stiffness and structural cohesion.

By scrutinizing the behavior of this micro-crack, the paper identifies three key parameters crucial to understanding its evolution: the initial crack length along the interface, the angle at which the crack extends into the more brittle material, and the length of its subsequent growth. These parameters serve as the compass guiding the exploration of how cracks propagate and influence the joint's performance.

The findings of this study unveil a discernible trend: as the crack lengthens along the interface, the interface stiffness diminishes, thereby compromising the joint between the two materials. This insight underscores the delicate balance within material interfaces and underscores the criticality of managing and mitigating micro-crack propagation to uphold structural integrity.