University of Illinois Urbana-Champaign

Fatigue life and inelastic strain response under complex histories for alloy steel

Dowling, N. E.

Permalink

https://hdl.handle.net/2142/112081

Description

Title
Fatigue life and inelastic strain response under complex histories for alloy steel
Author(s)
Dowling, N. E.
Issue Date
1972-04
Keyword(s)
  • Fracture Life
  • Inelastic Strain
  • Complex Histories
  • Alloy Steel
Abstract
For quenched and tempered SAE 4340 steel, the inelastic strains measured during complex stress-strain histories are observed to be larger than would be estimated from constant amplitude test results. A cumulative fatigue damage procedure previously proposed is modified to account for this history dependence. Actual and calculated lives are compared for a variety of complex history fatigue tests on unnotched axially loaded specimens. To calculate fatigue lives using the modified procedure, it is necessary to have a stress-inelastic strain relationship obtained from constant amplitude fatigue tests. Initial overstraining at intermediate lives, and both initial and periodic overstraining at long lives, are employed for the constant amplitude tests so that the results are applicable to complex histories.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 354
  • 1972-6002
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112081
Sponsor(s)/Grant Number(s)
Naval Air Dev Center, 72/04
Copyright and License Information
Copyright 1972 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.