Abstract
Abstract This paper presents the fatigue behavior of Glass Fiber Reinforced Polymer (GFRP) composites at constant amplitude tension-tension loading conditions. A two parameter residual strength and fatigue life model has been proposed by accounting the effect of stress ratio when the structure undergoes continuous loading. A model is also developed to predict the fatigue life of GFRP composites based on fatigue endurance limit. Experiments were conducted on GFRP composite specimens to predict fatigue life and residual strength at various stress levels. Tests were also conducted to gain an understanding of the tensile behavior of GFRP composite specimens under different quasistatic strain rates. The lowest tensile strength resulting from strain rate studies has been used ultimately for conducting fatigue life and residual strength tests. Reliability of the proposed models has been verified with experimental results and with the models seen in literature.
Highlights
Fiber reinforced composites are extensively used in every sector ranging from aerospace to medical instruments due to their excellent properties such as high strength to weight ratio and high stiffness to weight ratio
The lowest ultimate tensile strength of Glass Fiber Reinforced Polymer (GFRP) composite is 330 N/mm2 which occurs at the strain rate of 0.5 mm/min
The lowest tensile strength of the GFRP composite was 330 N/mm2 at 0.5 mm/min which was taken as the input for carrying out the fatigue life tests
Summary
Fiber reinforced composites are extensively used in every sector ranging from aerospace to medical instruments due to their excellent properties such as high strength to weight ratio and high stiffness to weight ratio. The composite structures are made of higher weight and strength than required as a matter of safety, which is much more than with conventional metals or alloys. This problem with the composite materials occurs from the lack of prediction of damage and its propagation. One of the merits of composites is their potential to distribute the stress all over the plane by the matrix It is a drawback, as this makes the damage propagation more rapid, where the composites dissolve, lacking notable creep or a disclaimer before failure, places them back from extensive applications (Anderson, 2005)
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