Measurement of the Effects of Stress Ratio and Changes of Stress Ratio on Fatigue Crack Growth Rate in a Quenched and Tempered Steel

Abstract

This paper describes a technique that enables fatigue crack growth rate to be determined for a range of stress ratios, R, using a single specimen. The procedure eliminates some of the scatter normally encountered when data are obtained from multiple specimens. In the process of verifying the procedure, the effect of R on the fatigue crack growth rate in steel Q1N, and the effect of increases and decreases in R, have been examined. Change in the stress ratio causes significant change in the crack growth rate in the Paris regime, but transient effects are not observed unless the maximum stress intensity factor at the crack tip is reduced by more than about 10%. Crack growth, Experimental technique

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1994
Accession Number
ADA283753

Entities

People

  • I. M. Robertson

Organizations

  • Defence Science and Technology Group

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Australia
  • Crack Tips
  • Cracks
  • Equations
  • Intensity
  • Intervals
  • Materials
  • Measurement
  • Sequences
  • Standards
  • Steady State
  • Stress Intensity Factors
  • Stresses
  • Tensile Properties
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design