Application of Finite Element Methods with Cyclic Elasto-Plastic Strain Analysis to Low Cycle Fatigue Analysis of Engine Components,

Abstract

Low Cycle Fatigue (LCF) in engine components involves macroscopic cyclic plastic strains (with a stress-strain hysteresis loop) over a significant portion of the failure region. Characterising elasto-plastic behaviour in potential failure regions is a necessary step in estimating LCF life. The equations governing elasto plastic behaviour are summarized, and the methods of implementing them in Finite Element (FE) stress analysis programs, discussed. An extension of the PAFEC program to include mixed isotropickinematic hardening is outlined, and verified by examples for which alternative FE solutions were available. A sample application has been made to holes in a plate with biaxial stress fields similar to those in disc webs, and the results compared with the Neuber and modified Stowell rules commonly used for design life estimation; these rules tend to overestimate the strain in biaxial stress conditions, leading to conservative life estimates.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1986
Accession Number
ADA189810

Entities

People

  • N. S. Swansson

Tags

Communities of Interest

  • Air Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Biaxial Stresses
  • Computer Programs
  • Constitutive Equations
  • Engine Components
  • Finite Element Analysis
  • Geometry
  • Materials
  • Mechanics
  • Military Research
  • Modulus Of Elasticity
  • Plastic Properties
  • Strain Hardening
  • Stress Strain Relations
  • Stresses
  • Three Dimensional
  • Turbines
  • Two Dimensional

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.