Abstract
The effect of filler shape and filler volume fraction (micron sized rods, flakes and spheres) on dynamic fracture behavior of particulate polymer composites (PPC) is studied. The mode-I dynamic fracture experiments are carried out on pre-notched glass-filled epoxy specimens. An experimental set-up comprised of a long-bar apparatus to deliver one-point impact loading to an unconstrained specimen, is used in conjunction with a gas-gun. A controlled stress pulse is delivered to the specimen by impacting the long-bar by a striker launched using a gas-gun. A crack propagates into the specimen dynamically and is captured using high-speed photography (~300,000 frames per second). Using the Digital Image Correlation (DIC) method, in-plane displacement fields around the crack tip are determined from the speckle images recorded during the fracture event. With these, dynamic fracture toughness histories are evaluated to examine the filler shape effects. The results show pronounced improvement fracture toughness for all filler types with rod-shaped fillers producing ~145% increase in crack initiation toughness over unfilled epoxy at 15% V f with flakes and spheres showing ~97% and ~67% improvement, respectively.
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Partial support of this research through grant NSF-CMMI - 1100700 is gratefully acknowledged.
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© 2013 The Society for Experimental Mechanics, Inc.
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Kushvaha, V., Tippur, H. (2013). Effect of Filler Particle Shape on Dynamic Fracture Behavior of Glass-Filled Epoxy. In: Chalivendra, V., Song, B., Casem, D. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4238-7_66
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DOI: https://doi.org/10.1007/978-1-4614-4238-7_66
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