FACTOR OF SAFETY CONSIDERATIONS FOR AERODYNAMICALLY HEATED STRUCTURES SUBJECTED TO HIGH CYCLIC STRESSES

Abstract

a parametric study was made from published lowcycle fatigue data showing the various effects on cycles-to-failure. Included are uniaxial and biaxial experimental results. True total strain range, ratio of minimum-to- maximum strain, and effects of geometry are the predominate parameters affecting fatigue life for mechanical cycling at room and elevated temperatures. Structural life was investigated in terms of the parameters for mechanical cyclic loading as well as for cyclic thermal straining. In the former case, expressions relating the parameters to structural life were found. However, in the latter case, no reliable expression between these parameters and structural life was found. A specific expression for conservatively predicting structural life or endurance is developed and applies to all materials, ratios of minimumto-maximum strains, temperatures, and states of stress. Also considered were single-cycle failures resulting from thermal shock.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1961
Accession Number
AD0266556

Entities

People

  • E. H. Nickell
  • W. E. Jacobsen

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aluminum Alloys
  • Biaxial Stresses
  • Climate Change
  • Creep
  • Fatigue Life
  • Geometry
  • Grain Size
  • Heat Transfer
  • Materials
  • Mechanical Properties
  • Mechanics
  • Strain Hardening
  • Stress Analysis
  • Stress Concentration
  • Stress Strain Relations
  • Stresses

Readers

  • Combustion and Flow Dynamics.
  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.