Experimental Studies on Damage Growth in Composites under Dynamic Loads |
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Authors: | S Ravi N G R Iyengar N N Kishore A Shukla |
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Affiliation: | (1) Indian Institute of Technology, Kanpur, 208016, India;(2) University of Rhode Island, Kingston, RI 02881, USA |
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Abstract: | Experimental investigations have been carried out to study the dynamic damage growth in glass/polyester composites. Detonation of two PETN explosive charges on a modified single edge notch (MSEN) specimen provides the dynamic load in the form of a planar tensile wave. High speed photography is used to record the dynamic damage events. The results show that damage grows perpendicular to the loading direction, similar to the static growth; the damage zone splits analogous to the crack branching in unreinforced polyester. The damage propagation velocity in a composite is higher than the crack propagation velocity in polyester resin. The damage area grows at an average rate of 4.3 m2/sec. Static experiments show that about 4 percent of the total energy is spent on the fiber-matrix interface debonding. The damage zone under dynamic loads is much higher than under static loads. |
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Keywords: | transparent glass/polyester composites stress wave loading dynamic and static damage growth |
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