AN INVESTIGATION OF LOW-CYCLE FATIGUE FAILURES USING APPLIED FRACTURE MECHANICS

Abstract

Basic principles of fracture mechanics were applied to the investigation of cyclic flaw growth characteristics of Ladish D6A-C steel, tested at room temperature; 6Al-4V titanium, tested at -320 F; and 18Ni(300) maraging steel, tested at room temperature using uniaxially loaded, preflawed (fatigue cracked) test specimens. Applicability of such data to prediction of the cyclic life span of biaxially loaded pressure vessels has been verified by testing six 17-inchdiameter, preflawed Ladish D6A-C test tanks. A brief discussion of technical background illustrates the experimental approach and the significance of resulting test data. A method for utilization of NDT inspection and proof-pressure testing in conjunction with the cyclic flaw growth data for design purposes is also presented.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1964
Accession Number
AD0600375

Entities

People

  • C. F. Tiffany
  • P. M. Lorenz

Organizations

  • Boeing

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Base Metal
  • Boundaries
  • Cyclic Tests
  • Diameters
  • Engineering
  • Equations
  • Fracture (Mechanics)
  • Heat Treatment
  • Materials
  • Mechanical Properties
  • Mechanics
  • Metals
  • Plastic Explosives
  • Pressure Testing
  • Steel
  • Tensile Properties
  • Test And Evaluation

Readers

  • Metallurgy
  • Structural Health Monitoring of Composite Structures.