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Title:Influence of compressive prestrain on fracture toughness of SAE 4340 steel
Author(s):Jobaris, Jerome Edward
Subject(s):Compressive Prestrain
Fracture Toughness
Abstract:It is known that prior stress histories influence the fracture toughness, KIC, of steel. This paper reports the effects of one-cycle, compressive prestrains on the fracture toughness of a high yield strength 4340 steel. Tensile tests of cylindrical, circumferently-notched specimens without a stress history were used to determine the KIC value of this steel. Secondly, a sample of the steel was subjected to uniform compressive prestrains, machined into notched specimens, and fractured in tension. The third type of stress history consisted of subjecting a series of notched specimens to compressive loads before fracture testing. These specimens experienced a plastic prestrain in the small volume of material at the notch tip, while the central area at the notch was not plastically deformed. Comparing the KIC values for the three types of stress histories indicated an appreciable loss of fracture toughness for the specimens subjected to a uniform compressive prestrain. There was no indication that the fracture toughness was influenced by the localized compressive prestrain at the notch root.
Issue Date:1962-02
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 219
Genre:Technical Report
Sponsor:U.S. Naval Research Laboratory, Contract No. Nonr 2947 (01)(X), SP Task Assignment 71402, Project Order 970
Rights Information:Copyright 1962 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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