Threshold Fatigue Crack Growth Behavior

Abstract

This constitutes the Final Report for Air Force Contract F33615-85-C-5050. Threshold Fatigue Crack Growth Behavior. The sponsoring agency was the Materials Laboratory, Wright Research Development Center, Wright-Patterson Air Force Base, Dayton, Ohio. The period of performance was 1 August 1985 through 31 July 1988. The objective of the program was to develop and demonstrate a methodology for predicting the high cycle fatigue (HCF) life of a gas turbine engine blade alloy containing defects of either intrinsic or extrinsic origin using threshold fracture mechanics concepts. The program centered around experimental measurements of threshold stress intensity (delta) for Ti 8Al-1Mo-1V and the assessment of influencing factors such as frequency, stress ratio, and temperature. The uniqueness of K sub th as well as the effects of time-dependent crack growth behavior were also investigated. Finally, an attempt was made to model HCF behavior based on fracture mechanics principles and the delta K sub th data base. Keywords: Threshold crack growth; Fracture mechanics; High cycle fatigue; Fatigue.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1989
Accession Number
ADA218063

Entities

People

  • C. G. Annis Jr.
  • E. H. Hindle
  • F. K. Haake
  • G. C. Salivar
  • J. W. Fischer

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Advanced Materials
  • Air Force Facilities
  • Chemistry
  • Databases
  • Engine Components
  • Fatigue Tests (Mechanics)
  • Fracture (Mechanics)
  • Gas Turbines
  • Intensity
  • Manufacturing
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Testing
  • Mechanics
  • Test Methods
  • Turbines

Fields of Study

  • Engineering

Readers

  • Aerospace Research.
  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.