IZOD IMPACT CHARACTERISTICS OF GLASS FIBER/EPOXY FUNCTIONALLY- GRADED (FG) COMPOSITE LAMINATES WITH STATISTICAL ANALYSIS

Abdul-aziz I. Selmy, Marwa A. Abd el-baky, Mohamed R. Ghazy, Madeha K. Ibrahem

Abstract


The main objective of this paper is to study the effect of fiber-content gradation on the impact behavior of unidirectional glass fiber/epoxy composites. Two kinds of functionally graded (FG1, FG2) glass fiber/epoxy composites with total fiber volume fraction of 40.2 % and thickness of 6mm were fabricated using hand lay-up technique. Three kinds of glass fiber/epoxy composites with uniform fiber content distribution through the specimen thickness with a different number of layers (laminas) and with the same total fiber volume fraction and thickness were also prepared for comparison. The impact energy and the impact strength were determined experimentally using notched Izod impact tests. The specimen failure modes were investigated and discussed. Two-parameter Weibull distribution function was used to statistically analyze the impact results of test samples and the scatter in the experimental results. The probability of failure curves are plotted for the impact strength of all material specimens investigated. The results show that, the FG glass/epoxy composites have higher impact energies and impact strengths than glass/epoxy composites. Also, for the FG composites, the material having a rich-fiber core gives higher impact energy and strength than that of a poor-fiber core. For the glass/epoxy composites as the number of layers increases the impact energy and strength increase

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