Degradation of single lap adhesively bonded composite joints due to hot water ageing
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Date
2017
Authors
Soykok I.F.
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Abstract
Joints, which are the most critical part of fibre-reinforced epoxy plastic structures, can be exposed to continuous hydrothermal action. In order to estimate their long-term performance, an accelerated ageing process was performed on adhesively bonded joints of glass-fibre-reinforced epoxy plastics with [0/90/45/−45]s fibre orientations. Changes in the static tensile properties of single lap shear samples due to hot-wet exposure were investigated for one- and two-week immersion periods and at three different water temperatures (50°C, 70°C, and 90°C). Both the ageing temperature and immersion time were found to be influential on load–displacement characteristics, maximum failure loads, and apparent failure modes of joints bonded with Loctite Hysol-9466 epoxy type adhesive. Due to the hydrothermal exposure, maximum failure loads, distance to failure values, and stiffness of joints decreased by a certain amount in proportion to the immersion time and temperature. While unaged samples and those aged at 50°C and 70°C exhibited mainly light fibre-tear (LFT) failures, the samples treated at 90°C ruptured through the material cross section in stock-break (SB) failure mode. © 2017 Taylor & Francis.
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Keywords
Adhesive joints, Composite materials, Failure modes, Joints (structural components), Reinforcement, Accelerated ageing process, Adhesively bonded composite joints, Adhesively bonded joints, Aerospace, ageing, Destructive testing, Displacement characteristic, Epoxy/epoxides, Fibers