University of Illinois Urbana-Champaign

Comparison plane strain fracture toughness and isothermal flow properties of structural steel

Koves, William John

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https://hdl.handle.net/2142/112025

Description

Title
Comparison plane strain fracture toughness and isothermal flow properties of structural steel
Author(s)
Koves, William John
Issue Date
1967-08
Keyword(s)
  • Fracture Toughness
  • Isothermal Flow Properties
  • Steel
Abstract
Presented in this paper are the results of a series of isothermal tensile flow tests carried out over a wide range of temperatures and stain rates. The material used for the tensile specimens was an X-52 steel, pipeline material with a room temperature static yield strength of 49,200 psi. The test temperatures ranged from room temperatures to -200°F, and the strain rates used varied between 10-4 and 10 in/in/sec. Both isothermal and adiabatic flow tests were carried out, at selected values of temperature and strain rate, for comparison purposes. The greatest difference between an isothermal and an adiabatic strain hardening exponent occurred at the highest strain rates and the lowest temperatures, where differences as large as 56% were observed. The isothermal strain hardening exponent was found to be a single valued function of the rate parameter T ln [A/ϵ ̇]. This characterization revealed a strain rate and temperature sensitivity transition from a sensitive to an insensitive region for increasing values of T ln [A/ϵ ̇]. An evaluation of Krafft’s fracture criteria suggested a plateau, temperature and strain rate insensitive, KIC value for this material.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 302
  • 1967-0735
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112025
Sponsor(s)/Grant Number(s)
American Iron and Steel Institute, Committee on Properties of Iron and Steel, AISI 44 22 60
Copyright and License Information
Copyright 1967 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.