Double strap lap adhesive joints between metal (AA 6061-T6) and composite (carbon/epoxy) laminates were fabricated and characterized based on strength. Hand layup methods were used to fabricate double strap match lap joints and double strap mismatch lap joints. These joints were compared for their strength under static and fatigue loadings. Fracture toughness (GIIC) was measured experimentally using tensile testing and validated with numerical simulations using the cohesive zone model (CZM) in ABAQUS/Standard. Fatigue life under tension-tension fluctuating sinusoidal loading was determined experimentally. Failure loads for both joints were in close relation, whereas the fatigue life of the double strap mismatch lap joint was longer than that of the double strap match lap joint. A cohesive dominating failure pattern was identified in tensile testing. During fatigue testing, it was observed that inhomogeneity (air bubble) in adhesive plays a negative role while the long time duration between two consecutive cycle spans has a positive effect on the life of joints.

Department of Electrical Engineering The Ibadat International University Islamabad 54590 Pakistan

Department of Machining Assembly and Engineering Metrology VSB Technical University of Ostrava 17 Listopadu 2172 15 Street 708 00 Ostrava Czech Republic

Department of Mechanical Engineering Capital University of Science and Technology Islamabad 44000 Pakistan

Department of Mechanical Engineering Technology National Skills University Islamabad 44000 Pakistan

Department of Mechanical Engineering University of Wah Quaid Avenue Wah Cantt 47040 Pakistan

Department of Unmanned Vehicle Engineering Sejong University Seoul 05006 Korea

Electrical Engineering Department College of Engineering Najran University Saudi Arabia Najran 61441 Saudi Arabia

Faculty of Mechanical Engineering Poznan University of Technology 3 Piotrowo Street 60 965 Poznan Poland

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