Experimental and Numerical Study of Interfacial Fracture Parameters of a Brazed Joints
Résumé
This paper deals with an identification methodology of the interfacial fracture parameters
to predict the lifetime of a metallic brazed joint. The methodology is based on an experimentalnumerical
study whereby the optimal parameters are obtained. The experimental data, using the
scanning electron microscope analysis, allowed approving that failure of the assembly based AuGe
solder seems first to appear near the interfaces. These results were confirmed by micrographs
analysis of the solder/insert and solder/substrate interfaces. Then, using shear test results and
parametric identification coupled with a finite elements model (FEM) simulation, the damage
constitutive law of the interfacial fracture based on a bilinear cohesive zone model are identified.
The agreement between the numerical results and the experimental data shows the applicability of
the cohesive zone model to fatigue crack growth analysis and life estimation of brazed joints.
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