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A series of cracked specimen configurations have been tested to correlate the geometry dependence of crack tip constraint and fracture toughness in full plasticity. Specimens with through cracks included a range of edge-cracked bend bars, compact tension specimens, and center-cracked panels. Surface-cracked panels were tested in tension to produce resistance curves.
The geometry dependence of ductile crack extension in plane strain has been correlated with crack tip constraint as parameterized by the T stress, which indicates the nature of the development of higher order terms in the nonlinear asymptotic crack tip expansion.
T, stress, toughness, constraint
University of Glasgow, Glasgow,
EG & G, Idaho National Engineering Laboratory, Idaho Falls, Idaho
Massachusetts Institute of Technology, Cambridge, MA