Specimen size effect during tensile testing of an unreinforced polymer |
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Authors: | E. M. Odom D. F. Adams |
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Affiliation: | (1) Composite Materials Research Group, University of Wyoming, 82071 Laramie, Wyoming, USA;(2) Present address: Department of Mechanical Engineering, University of Idaho, 83843 Moscow, Idaho, USA |
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Abstract: | Various specimen sizes of an unreinforced polymer, Hercules 3501 -6 thermosetting epoxy, were subjected to a tensile test. The general specimen geometry was a rectangular dog-bone shape with constant gauge length, but with each specimen size having a different crosssectional area. These cross-sectional areas were obtained by varying the thickness of the epoxy during casting, and the gauge section width during grinding. The resulting failure surfaces of the specimens were observed and photographed using scanning electron microscopy. The results indicate that failure stress, dimensions of the critical flaw which caused failure, and a quantity which is proportional to the fracture toughness, are all correlated with specimen size. |
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