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Numerical modelling of P/M steel bars subjected to fatigue loading using an extended Gurson model

Cedergren, Joakim LU ; Melin, Solveig LU and Lidström, Per LU (2004) In European Journal of Mechanics. A, Solids 23(6). p.899-908
Abstract
The possibility of modelling experiments conducted on P/M steel bars subjected to strain controlled fatigue loading is investigated. The constitutive relation is an extended Gurson model, using a viscoplastic formulation with plasticity driven damage accumulation supplemented by kinematic as we'll as isotropic hardening. The total damage is modelled as the sum of void growth and void nucleation. Plasticity driven heat accumulation under adiabatic conditions is furthermore included in the model. The damage accumulation was monitored after choosing a kinematically hardening material model. Also rate effects were investigated. It was shown that by assuming the reference viscoplastic strain rate to be constant, increases in damage accumulation... (More)
The possibility of modelling experiments conducted on P/M steel bars subjected to strain controlled fatigue loading is investigated. The constitutive relation is an extended Gurson model, using a viscoplastic formulation with plasticity driven damage accumulation supplemented by kinematic as we'll as isotropic hardening. The total damage is modelled as the sum of void growth and void nucleation. Plasticity driven heat accumulation under adiabatic conditions is furthermore included in the model. The damage accumulation was monitored after choosing a kinematically hardening material model. Also rate effects were investigated. It was shown that by assuming the reference viscoplastic strain rate to be constant, increases in damage accumulation and temperature per load cycle with decreasing loading frequency is obtained. This unrealistic behaviour was shown to be eliminated by choosing the reference viscoplastic strain rate a function of the first invariant of the rate of deformation tensor. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
fatigue loading, finite elements, porous material, Gurson model, rate, dependence
in
European Journal of Mechanics. A, Solids
volume
23
issue
6
pages
899 - 908
publisher
Elsevier
external identifiers
  • wos:000225642200001
  • scopus:7544238353
ISSN
1873-7285
DOI
10.1016/j.euromechsol.2004.08.002
language
English
LU publication?
yes
id
b84d8763-4d86-48e8-aeea-2604d1f56503 (old id 259277)
date added to LUP
2007-10-17 16:27:48
date last changed
2017-01-01 04:58:41
@article{b84d8763-4d86-48e8-aeea-2604d1f56503,
  abstract     = {The possibility of modelling experiments conducted on P/M steel bars subjected to strain controlled fatigue loading is investigated. The constitutive relation is an extended Gurson model, using a viscoplastic formulation with plasticity driven damage accumulation supplemented by kinematic as we'll as isotropic hardening. The total damage is modelled as the sum of void growth and void nucleation. Plasticity driven heat accumulation under adiabatic conditions is furthermore included in the model. The damage accumulation was monitored after choosing a kinematically hardening material model. Also rate effects were investigated. It was shown that by assuming the reference viscoplastic strain rate to be constant, increases in damage accumulation and temperature per load cycle with decreasing loading frequency is obtained. This unrealistic behaviour was shown to be eliminated by choosing the reference viscoplastic strain rate a function of the first invariant of the rate of deformation tensor.},
  author       = {Cedergren, Joakim and Melin, Solveig and Lidström, Per},
  issn         = {1873-7285},
  keyword      = {fatigue loading,finite elements,porous material,Gurson model,rate,dependence},
  language     = {eng},
  number       = {6},
  pages        = {899--908},
  publisher    = {Elsevier},
  series       = {European Journal of Mechanics. A, Solids},
  title        = {Numerical modelling of P/M steel bars subjected to fatigue loading using an extended Gurson model},
  url          = {http://dx.doi.org/10.1016/j.euromechsol.2004.08.002},
  volume       = {23},
  year         = {2004},
}