Crack-opening displacements in center-crack, compact, and crack-line wedge-loaded specimens
National Aeronautics and Space Administration, 1976 - Technology & Engineering - 31 pages
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2a/W ratios 2EV SW accurate polynomial expressions approximate specimen configurations ASTM Proposed Recommended boundary collocation boundary conditions center-crack specimen center-crack tension CCT CLWL speci CLWL specimen collocation analysis compact and CLWL compact and crack-line compact specimen configurations and load crack length-width ratio crack line crack-line wedge-loaded CLWL crack-line wedge-loaded specimens curves show dashed curve derived by Irwin DISPLACEMENTS 2EV/SW displacements at various displacements for center-crack DISPLACEMENTS FOR COMPACT displacements were calculated distributed line load Eftis and Liebowitz equation 13 experimental data FUNCTION OF a/W functions of crack Langley Research Center method of boundary NASA obtain the theoretical pin-loaded holes plane strain PLANE-STRESS CONDITIONS plane-stress displacements Poisson's ratio Practice for R-Curve Proposed Recommended Practice R-Curve Determination 1974 resultant forces satisfied approximately show the collocation specified number SPECIMEN AS FUNCTION specimens See figs Stress Analysis Stress Intensity Factor theoretical crack-opening displacements theoretical displacements Theory of Elasticity uniformly distributed line V1/V2 ratios x-axis