SYMPOSIA PAPER Published: 01 January 1995

Interpretation of Warm Prestress-Induced Fracture Toughness Based on Crack-Tip Constraint


This study explores the possibility of using J-Q-related crack-tip constraint concepts to provide a basis for both the interpretation of warm prestress (WPS)-induced fracture toughness and its transferability to structural applications. A finite-element boundary-layer formulation based on small-scale yielding (SSY), remote mode I K-dominant assumptions is adopted. Effects of WPS-induced crack-tip constraint are quantified in terms of deviation in either the opening-mode or the mean stress component of the WPS crack-tip fields relative to the reference K-dominant SSY state associated with monotonic-loading conditions. Over the range of WPS load-paths considered the WPS-induced crack-tip constraint closely resembles a spatially varying hydrostatic stress field. Interpretation and transferability of WPS fracture toughness under SSY conditions are specified in terms of the unload and reload ratio.

Author Information

Shum, DKM
Oak Ridge National Laboratory, Oak Ridge, TN, USA
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Developed by Committee: E08
Pages: 685–704
DOI: 10.1520/STP14625S
ISBN-EB: 978-0-8031-5294-6
ISBN-13: 978-0-8031-1882-9