Effect of Loading Sequence on Notch Strength of Warm Prestressed Alloy Steel

[+] Author and Article Information
W. R. Andrews

General Electric Company, Knolls Atomic Power Lab., Schenectady, N. Y.

J. Eng. Ind 92(4), 785-791 (Nov 01, 1970) (7 pages) doi:10.1115/1.3427847 History: Received June 15, 1970; Online July 15, 2010


An experimental study of the effects of warm prestressing on the fracture strength of notched and fatigue-cracked bend bars of a Ni-Cr-Mo, low-alloy forging-grade steel was conducted. The steel was tested in four heat treatment conditions simulating four thickness fractions of a 23-1/2 -in-thick forging. Three load-temperature paths were investigated: (1) preload-cool-fracture, (2) preload-cool-unload-fracture, (3) preload-unload-cool-fracture. The fracture strengths of the prestressed bars were compared with the fracture strengths of unprestressed bars. The benefits of prestressing for each load-temperature path decreased in the order listed, although prestressing was always beneficial. The benefits also decreased with decreasing fracture-test temperature relative to the 50-percent FATT.

Copyright © 1970 by ASME
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