The Effects of LCF Loadings on HCF Crack Growth

Abstract

This report results from a contract tasking University of Portsmouth as follows: The contractor will investigate high cycle fatigue (HCF) effects in structural materials. This work will be a logical follow-on to a previous phase conducted under EOARD contract. In this phase, the contractor will begin by collating and reviewing all data relating to threshold values and combined high and low cycle fatigue testing on forged material previously developed at the contractor's laboratory. Following this step, the contractor will study the effects of different numbers and distributions on the LCF cycles on the crack growth rate for HCF loadings having a high stress ratio. Finally, the contractor will identify the jump-in (or step change) and implied (or derived) fatigue threshold values associated with these loadings and compare them with load shed values.

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Document Details

Document Type
Technical Report
Publication Date
May 24, 1999
Accession Number
ADA380152

Entities

People

  • Brian E. Powell
  • R. F. Hall

Organizations

  • University of Portsmouth

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Agreements
  • Alloys
  • Aluminum Alloys
  • Buildings And Structures
  • Classification
  • Contractors
  • Contracts
  • Engineering
  • Foreign Object Damage
  • Materials
  • Materials Laboratories
  • Research Facilities
  • Stress Waves
  • Stresses
  • Test Facilities
  • Test Methods
  • Titanium Alloys

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.
  • Technical Research and Report Writing.