A cohesive zone model for fracture initiation and propagation of fused silica direct bonding interface

Abstract

Fused silica direct bonding is of particular interest for optical system manufacturing for spatial applications. However, in order to validate the European Space Agency standards, a better understanding of the assemblies mechanical behavior is required. Therefore, it is important to develop some predictive tools to determine numerically mechanical strength of complex assemblies. In this paper, a cohesive zone model is proposed to model the direct bonding interface behavior. In order to determine the mechanical strength of the interface, a propagation test, and an initiation test on a free edge the cleavage test have been performed on direct bonded fused silica samples. The FIT test (Flexible Initiation Test) is also used to identify the properties of the direct bonding joint. At the end, a comparative analyses is proposed between experimental results and finite elements models of the propagation and initiation tests.

Modelling of a GFRP adhesive connection by an imperfect soft interface model with initial damage

“…Moreover, adhesively bonded joints offer many advantages for the design of structures. But to improve the confidence that currently limits the use of this technology, several authors try to develop experimental [15] [16] [17] or numerical [18] [19] [20] approaches.…”