HCF + LCF Interactions at Elevated Temperature

Abstract

This report results from a contract tasking University of Portsmouth as follows: The onset of high cycle fatigue (HCF) crack propagation in Ti- 6Al-4V will be studied under combined HCF/low cycle fatigue (LCF) loading conditions at elevated temperatures up to 350 deg C where creep stress ratcheting and environmental effects may arise. The study will be applied to a simulated mission-loading spectrum. SEM fractography metallography and crack closure measurements will be used to assess the mechanisms contributing to fatigue crack growth. The study will be carried out on corner crack (CN) square cross-section specimens of forged Ti-6Al-4V and on single edge cracked rolled plate specimens of the same alloy. Information previously obtained for this alloy at room temperature will provide a baseline for comparison.

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Document Details

Document Type
Technical Report
Publication Date
Mar 02, 2005
Accession Number
ADA455283

Entities

People

  • J. Ding
  • James Byrne
  • R. F. Hall

Organizations

  • University of Portsmouth

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Contracts
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Experimental Data
  • Flight Simulations
  • Fracture (Mechanics)
  • Materials
  • Materials Laboratories
  • Mechanics
  • Predictive Modeling
  • Simulations
  • Spectra
  • Stress Intensity Factors
  • Stress Waves
  • Three Dimensional

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Mechanical Engineering/Mechanics of Materials.
  • Powder metallurgy of Titanium alloys.