The effect of the fiber/matrix interface on the flexural fatigue performance of unidirectional fiberglass composites |
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| Affiliation: | 1. Composite Construction Laboratory (CCLab), École Polytechnique Fédérale de Lausanne (EPFL), Station 16, Bâtiment BP, CH-1015 Lausanne, Switzerland;2. AMADE, Mechanical Engineering and Industrial Construction Department, Universitat de Girona, Campus Montilivi s/n, Girona, Spain;3. Serra Húnter Fellow, Generalitat de Catalunya, Spain;1. National Textile University, National Centre for Composite Materials, Faisalabad, Pakistan;2. Normandie University, UNIHAVRE, CNRS, LOMC, Le Havre, France;1. Department of Restorative Dentistry and Dental Materials, Dentistry School, Federal University of Goiás, Goiânia, Goiás, Brazil;2. Dental School, Federal University of Goiás, Goiânia, Goiás, Brazil |
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| Abstract: | Fatigue tests were conducted on oriented fiberglass-reinforced polymer matrix composites using four-point bending with a stress ratio of −0·8. Composites in which the fiberglass was treated with a commercial diaminofunctional silane coupling agent were found to possess a relatively high flexural fatigue performance compared with composites without coupling agents. Using the interlaminar shear strength as an indication of the interface strength, it was found that composites having a high interface strength possess a high fatigue performance. The failure sequence of the flexural (tensile) fatigue was identified as: nucleation and growth of superficial damage (including fiber ridging, transverse matrix cracking, longitudinal matrix cracking, fiber breaking and local delamination), sudden fiber-bundle breakage and, finally, macroscopic delamination. A strong interface between fiber and matrix delayed the occurrence of fiber ridging and longitudinal matrix cracking, thus improving the fatigue performance of the unidirectional composites. |
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