Effect of autoclave cure time and bonded surface roughness on the static and fatigue performance of polyurethane film Adhesive Single lap joints |
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Affiliation: | 1. Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Turin, Italy;2. Fastening and Joining Research Institute (FAJRI), Department of Mechanical Engineering, Oakland University, Rochester, MI, 48309, USA;1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China;2. Advanced Composites Center R&D Department, Shanghai Aircraft Manufacturing Co., Ltd., Shanghai, 201324, China;1. Dept. of Mechanical Eng., Erzurum Technical University, 25050, Erzurum, Turkey;2. Independent Researcher, 25050, Erzurum, Turkey |
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Abstract: | This study investigates the effect of autoclave cure time and bonded surface roughness on the static and fatigue performance of film-adhesive single lap joints. Joint static performance is assessed in terms of its load transfer capacity in a quasi-static tensile-shear test to failure. Effect on fatigue life under a mean and cyclic tensile-shear amplitude is also investigated. Two levels autoclave cure (soak) time and two levels of bond surface roughness are investigated. All other autoclaving process variables are kept constant; namely, the ramp rate of temperature rise/cooling, pressurization/depressurization, as well as the cure temperature and cure pressure levels. Test joints are made of aluminium-aluminium or aluminium-magnesium adherends, joined with a polyurethane film adhesive. The results suggest that: an increase of the surface roughness is beneficial to static strength and detrimental to fatigue strength; an increase of the autoclave soak (cure) time is beneficial both to static and fatigue strength. Test data, failure mode analysis, discussion, observations and conclusions are provided. |
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Keywords: | A. polyurethane B. aluminium and alloys C. lap-shear Fatigue Autoclave bonding Film adhesive |
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