Experimental investigation of R-ratio effects on fatigue crack growth of adhesively-bonded pultruded GFRP DCB joints under CA loading |
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| Authors: | Moslem Shahverdi Anastasios P Vassilopoulos Thomas Keller |
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| Affiliation: | 1. École Polytechnique Fédérale de Lausanne (EPFL);1. School of Transportation, Southeast University, Nanjing 210096, China;2. School of Civil Engineering, Southeast University, Nanjing 210096, China;1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Delft University of Technology, Faculty of Civil Engineering and Geosciences, PO Box 5048, 2600 GA Delft, The Netherlands |
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| Abstract: | A series of fatigue experiments was performed in order to investigate the effect of the R-ratio on the fatigue/fracture behavior of adhesively-bonded pultruded GFRP double cantilever beam joints. Constant amplitude fatigue experiments were carried out under displacement control with a frequency of 5 Hz in ambient laboratory conditions. Three different R-ratios were applied: R = 0.1, R = 0.5 and R = 0.8. The crack length was determined by means of crack gages and a dynamic compliance method. The dominant failure mode was a fiber-tear failure that occurred in the mat layers of the pultruded laminates. The depth of the crack location significantly affected the energy dissipated for the fracture under cyclic loading. Short-fiber and roving bridging increased the fracture resistance during crack propagation. Fatigue crack growth curves were derived for each R-ratio and each observed crack path location. The fatigue threshold and slope of the fatigue crack growth curve significantly increased with increased R-ratio. |
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