Accession Number : ADA189810

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

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Swansson, N S

PDF Url : ADA189810

Report Date : Dec 1986

Pagination or Media Count : 43

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.

Descriptors :   *BIAXIAL STRESSES, *ENGINE COMPONENTS, *STRESS ANALYSIS, AUSTRALIA, CYCLES, EQUATIONS, FAILURE, FATIGUE, FINITE ELEMENT ANALYSIS, HARDENING

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE