Stiffness degradation and fatigue life prediction of adhesively-bonded joints for fiber-reinforced polymer composites
✍ Scribed by Ye Zhang; Anastasios P. Vassilopoulos; Thomas Keller
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 420 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0142-1123
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✦ Synopsis
Adhesively-bonded joints, including double-and stepped-lap joints (DLJs and SLJs), were experimentally investigated under cyclic tensile loading. The joints were composed of pultruded GFRP laminates and epoxy adhesive. A critical stiffness was found for DLJs and a critical elongation for SLJs at which failure occurs independently of load level. Based on measured uniform stiffness degradation during the fatigue life of DLJs, a linear model of stiffness degradation was established. For SLJs, after crack initiation, stiffness decreased at a higher rate during the initial and final stages of crack propagation. A non-linear sigmoid model was established. Results of both models compared well to experimental results and enabled F-N curves suitable for design to be established.