University of Illinois Urbana-Champaign

Influence of compressive prestrain on fracture toughness of SAE 4340 steel

Jobaris, Jerome Edward

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https://hdl.handle.net/2142/111935

Description

Title
Influence of compressive prestrain on fracture toughness of SAE 4340 steel
Author(s)
Jobaris, Jerome Edward
Issue Date
1962-02
Keyword(s)
  • Compressive Prestrain
  • Fracture Toughness
  • Steel
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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 219
  • 1967-0515
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/111935
Sponsor(s)/Grant Number(s)
U.S. Naval Research Laboratory, Contract No. Nonr 2947 (01)(X), SP Task Assignment 71402, Project Order 970
Copyright and License Information
Copyright 1962 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.