Abstract
Smooth specimens and circumferentially notched bars with a “Bridgman” notch geometry were tested uniaxially at 700° C in air in the stress range of 340 to 700 MPa. The results indicated that the material was notch strengthened on the basis of net section stress,σ a. However, when the fracture lifetimes were plotted as a function of the Bridgman effective stress,σ e, all the data points fell approximately on one line. Cavity nucleation sites changed systematically from notch throat at the highest stress to notch root at the low stress. The notch rupture ductility in the notched specimens were found to have a lower value than in the smooth ones at all stresses.
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Pandey, M.C., Mukherjee, A.K. & Taplin, D.M.R. Effect of triaxial stress-state on creep fracture in Inconel alloy X-750. J Mater Sci 20, 1201–1206 (1985). https://doi.org/10.1007/BF01026314
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DOI: https://doi.org/10.1007/BF01026314