Failure prediction with Hashin failure criteria and stress analysis in central cracked aluminum plate repaired with composite patches

In this study, the center cracked aluminum plates repaired with one-side and two-side composite patches are investigated numerically for their response to transient dynamic loading. Contour integral method is used to define and evaluate the stress intensity factors at the crack tip. Two different types are used for composite patches, single patch and double patch. The effect of the adhesive epoxy film, patch thickness and crack length on the evolution of the stress intensity factor (SIF) of the repaired structure is examined. The results indicated that the SIF of the center cracked plate is reduced by ۱/۴ to۱/۱۰ as a result of the bonded composite patch repair. Shear strength and thickness of the adhesive bond are more significant and effective in the repaired structure. The failure of the patch is investigated with Hashin failure criteria in four modes, tensile failure of fibers, compressive failure of fibers, tensile failure of matrix and compressive failure of matrix.

کلیدواژه ها:

crack-patching ، combined tension-torsion loading – Hashin failure criteria