UNIFIED MODELING OF TIME-DEPENDENT DAMAGE TAKING INTO ACCOUNT AN EXPLICIT DEPENDENCY ON BACKSTRESS

Authors
Citation
J. Aktaa et B. Schinke, UNIFIED MODELING OF TIME-DEPENDENT DAMAGE TAKING INTO ACCOUNT AN EXPLICIT DEPENDENCY ON BACKSTRESS, International journal of fatigue, 19(3), 1997, pp. 195-200
Citations number
11
Categorie Soggetti
Material Science","Engineering, Mechanical
ISSN journal
01421123
Volume
19
Issue
3
Year of publication
1997
Pages
195 - 200
Database
ISI
SICI code
0142-1123(1997)19:3<195:UMOTDT>2.0.ZU;2-X
Abstract
A new continuum damage model is presented. It describes the time depen dent damage of metallic materials at high temperatures in a unified ma nner, without a subdivision into creep and fatigue damage parts. Takin g into account the dependence of damage evolution on the deformation h istory, a dependency of the damage rate on an internal variable, the b ackstress, is incorporated. The model is formulated first with a scala r damage variable for uniaxial load cases. Some ideas on a multiaxial extension are discussed. For application, the new model is coupled wit h the viscoplastic deformation model proposed by Chaboche. Low-cycle f atigue tests with the Ni-base alloy Nicrofer 5520 Co are considered, a nd the results are presented. The influence of the deformation model o n the results of prediction of the new damage model is discussed. Copy right (C) 1997 Elsevier Science Limited.