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THREE-DIMENSIONAL FINITE-ELEMENT ANALYSIS OF FINITE-THICKNESS FRACTURE SPECIMENS

机译：有限厚裂缝试样的三维有限元分析

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摘要

The stress-intensity factors for most of the commonly used fracture specimens (center-crack tension, single- and double-edge-crack tension, and compact), those that have a through-the-thickness crack, were calculated using a three-dimensional finite-element elastic stress analysis. Three-dimensional singularity elements were used around the crack front. The stress-intensity factors along the crack front were evaluated by using a force method, developed herein, that requires no prior assumption of either plane stress or plane strain.nThe calculated stress-intensity factors from the present analysis were compared with those from the literature whenever possible and were generally found to be in good agreement. The stress-intensity factors at the midplane for all specimens analyzed were within 3 percent of the two-dimensional plane-strain values. The stress-intensity factors at the specimen surfaces were considerably lower than at the midplanes. For the center-crack tension specimens with large thickness-to-crack-length ratios, the stress-intensity factor reached a maximum near the surface of the specimen. In all other specimens con¬sidered the maximum stress intensity occurred at the midplane.

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