Analytical stress intensity solution for the stable Poisson loaded specimen |
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Authors: | Louis J. Ghosn Anthony M. Calomino David N. Brewer |
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Affiliation: | (1) Sverdrup Technology, Inc., Lewis Research Center Group, 44142 Brook Park, Ohio, USA;(2) National Aeronautics and Space Administration, Lewis Research Center, 44135 Cleveland, Ohio, USA;(3) U.S. Army Research Laboratory, Lewis Research Center, 44135 Cleveland, Ohio, USA |
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Abstract: | An analytical calibration of the Stable Poisson Loaded (SPL) specimen is presented. The specimen configuration is similar to the ASTM E-561 compact-tension specimen with displacement controlled wedge loading used for R-curve determination. The crack mouth opening displacements (CMOD's) are produced by the diametral expansion of an axially compressed cylindrical pin located in the wake of a machined notch. Due to the unusual loading configuration, a three-dimensional finite element analysis was performed with gap elements simulating the contact between the pin and specimen. In this report, stress intensity factors, CMOD's, and crack displacement profiles, are reported for different crack lengths and different contacting conditions. It was concluded that the computed stress intensity factor decreases sharply with increasing crack length thus making the SPL specimen configuration attractive for fracture testing of brittle, high modulus materials. |
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