Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5015241 | International Journal of Fatigue | 2017 | 36 Pages |
Abstract
Fatigue lifetime is one of the most important factors that need to be considered when determining a material's design. This study deals with fatigue behaviors in adhesive bonded joints. Fatigue tests were conducted using double cantilever beam specimens to measure the fatigue crack growth properties of the DP8005 acrylic-based adhesive under Mode I loading on aluminum alloy, glass fiber-reinforced polypropylene matrix composite (GF/PP), and carbon fiber-reinforced epoxy matrix composite (CF/EP) adherends. The fracture surfaces were examined using a microscope to verify the fracture behaviors. The experimental results show that the slope (2.85) and intercept (2.14Â ÃÂ 10â10), as defined by the Paris law, expressed a relationship between the energy release rate range (ÎGI) and the crack growth rate (da/dN) for the three specimens were the same, in scenarios where the cohesive failures were dominant. The aluminum alloy specimens were found to have another slope and intercept at 1.36 and 6.00Â ÃÂ 10â7, respectively, when interfacial failures occurred. The threshold energy release rate range (ÎGI.th) for the GF/PP and CF/EP specimens were 69.3 and 72.5Â JÂ mâ2, respectively. ÎGI.th for the aluminum alloy specimens were 46.5 (denoted as ÎGI.th1st) and 5.4 (denoted as ÎGI.th2nd)Â JÂ mâ2. ÎGI.th (fracture morphology) can be ranked as aluminum alloy (ÎGI.th2nd, interfacial failure)Â <Â aluminum alloy (ÎGI.th1st, mixture of cohesive and interfacial failures)Â <Â GF/PP (mixture of cohesive and adherend failures)Â <Â CF/EP (cohesive failure).
Keywords
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Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Hyun-Bum Kim, Kimiyoshi Naito, Hiroyuki Oguma,