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The ORNL thermal-shock experiment TSE-5A is re-analyzed using the J-Q fracture methodology. The objective is to evaluate the hypothesis that potential toughness elevation associated with the shallow-flaw geometry in the TSE-5A cylinder is eliminated by the resence of a tensile axial stress that arises from the nearly equibiaxial nature of thermal-shock loading. Analysis results indicate that Q ≈ 0 for the TSE-5A experiment. Analysis and experimental results together suggest that neither the J-Q trajectory nor the Jc(Q) locus in the regime where Q ≈ 0 have been affected by the thermally-induced transverse load, relative to a situation with the axial stress absent. Therefore, the hypothesis under investigation is not supported by the analysis results and interpretation framework examined in this study.
thermal shock, TSE-5A, J-Q theory, crack-tip constraint, fracture toughness, biaxial loading
Senior Research Engineer, Saint-Gobain/Norton Industrial Ceramics Corporation, Northboro, MA