Cyclic plasticity and failure of structural componentsAn analytical approach for low-cycle fatigue prediction is presented. The approach combines a cyclic plasticity model with the finite element method and a damage accumulation criterion for ductile metals. The cyclic plasticity model is based on the concept of the combination of several yield surfaces. The surfaces are related to the material uniaxial stress-strain curve idealized by piecewise linear segments. The damage criterion is based on the Coffin-Manson formulae modified for the mean stress variation effect. It is extended to the multiaxial varying stress-strain field and applied for both the crack initiation and the crack growth processes. The stable slow crack growth rate is approximated by the damage accumulation gradient computed from the cracked finite element models. This procedure requires fatigue testing data of only smooth specimens under constant strain amplitudes. The present approach is illustrated by numerical examples of an aircraft wing stiffened panel subjected to compression, which causes material yielding and residual tension.
Document ID
19800050843
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Kalev, I.
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Subject Category
Structural Mechanics
Report/Patent Number
AIAA PAPER 80-0693
Meeting Information
Meeting: Structures, Structural Dynamics, and Materials Conference