Journal
COMPOSITE STRUCTURES
Volume 94, Issue 9, Pages 2982-2989Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2012.03.023
Keywords
Stainless steel adhesive joint; Aramid fiber; Fracture toughness; DCB test; CTE of adhesive; Cryogenic temperature
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Funding
- WCU (World Class University) program through National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-2008-000-10045-0]
- EEWS Research Project of the office of KAIST EEWS Initiative (EEWS: Energy, Environment, Water, and Sustainability) [EEWS-2011-N01110017]
- BK21
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Adhesives should be reinforced with reinforcing fibers for the bonding of adherends at cryogenic temperatures because all the adhesives become quite brittle at cryogenic temperatures. In this work, the film-type epoxy adhesive was reinforced with randomly oriented aramid fiber mats to decrease the CTE (Coefficient of Thermal Expansion) of the adhesive and to improve the fracture toughness of adhesive joints composed of stainless steel adherends at the cryogenic temperature of -150 degrees C. The cleavage tests of the DCB (Double Cantilever Beam) adhesive joints were performed to evaluate the fracture toughness and crack resistance of the adhesive joints. Also, the thermal and mechanical properties of the fiber reinforced adhesive layer were measured to investigate the relationship between the fracture toughness of adhesive joints and fiber volume fraction of aramid fibers. From the experiments, it was found that the crack propagated in the adhesive with the stable mode of significantly increased fracture toughness when the film-type epoxy adhesive was reinforced with aramid fiber mats. The optimum volume fraction of aramid fibers was suggested for the film-type epoxy adhesive in the adhesive joint at the cryogenic temperature of -150 degrees C. (C) 2012 Elsevier Ltd. All rights reserved.
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