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

Aurelien Maurel-Pantel (1) , M. Voisin , Q. Bui (2) , N. Cocheteau , Frédéric Lebon (1) , C. Hochard (3)

1 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
2 Ton Duc Thang University [Hô-Chi-Minh-City]
3 M&S - Matériaux et Structures

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.

Domaines: Mécanique des solides [physics.class-ph]; Mécanique des structures [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Génie mécanique [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]

Aurelien Maurel-Pantel, M. Voisin, Q. Bui, N. Cocheteau, Frédéric Lebon, et al.. A cohesive zone model for fracture initiation and propagation of fused silica direct bonding interface. Engineering Fracture Mechanics, 2019, pp.106649. ⟨10.1016/j.engfracmech.2019.106649⟩. ⟨hal-02277738⟩