SEDL / STP / STP1207-EB / STP13699S

Two-Parameter Crack-Tip Field Associated with Stable Crack Growth in a Thin Plate: An Experimental Study

Dadkhah, MS
Member of technical staff, Mechanics of Materials, Rockwell Science Center, Thousand Oaks, CA

Kobayashi, AS
Boeing Pennell Professor in Structure Mechanics, University of Washington, Seattle, WA

Pages: 14    Published: Jan 1994

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Abstract

J-integral values were determined directly from the measured orthogonal displacement fields surrounding a stably growing crack in 2024-0 and 5052-H32 aluminum alloy single-edge notched (SEN) and cruciform specimens of 0.8-mm thickness. These J values were then used to compute the crack-tip displacements associated with the Hutchinson-Rice-Rosengren (HRR) field. The displacement component as a result of the difference field in the simplified two-parameter J-Q or J-T ductile fracture theories was obtained by subtracting the HRR displacement from the measured crack-tip displacement. The slope of the log-log plots of the two orthogonal, difference-field displacement components varied irregularily with radial distance with no consistent second-order strain singularity. The results suggest that further analysis is necessary before the simplified J-Q theory can be used to analyze stable crack growth in thin plates.