CYCLIC STRAIN ACCUMULATION UNDER COMPLEX MULTIAXIAL LOADING

Abstract

When a tubular specimen of copper is subjected to a small steady tension and alternating torsion at room temperature large axial strain increments accumulate on a cyclic basis. At relatively low values of axial stress a steady state cyclic strain accumulation is observed to develop. The strains and cyclic strain rates which are observed are many orders of magnitude greater than corresponding values obtained under conditions of standard static creep tests performed at the same peak effective stress. They are also many larger than those obtained due to simple repetition of the effective stress in more conventional dynamic creep tests. The experiments reported herein were designed to produce an extreme case of cyclic creep wherein time and temperature dependence are minimized. The analysis of results includes a comparison with plasticity theory predictions as well as a parameteric description of minimum cyclic creep rate.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1963
Accession Number
AD0427919

Entities

People

  • G. J. Moyar
  • G. M. Sinclair

Organizations

  • University of Illinois Urbana–Champaign

Tags

DTIC Thesaurus Topics

  • Air Force
  • Axial Loads
  • Cyclic Tests
  • Engineering
  • Frequency
  • Hardening
  • Materials Laboratories
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Properties
  • Schematic Diagrams
  • Shear Stresses
  • Specifications
  • Steady State
  • Stress Strain Relations
  • Stresses
  • Thrust Bearings

Readers

  • Mechanical Engineering/Mechanics of Materials.