Computational aspects in presence of negative strain-rate sensitivity with application to aluminium alloys exhibiting the Portevin-Le Chatelier effect

被引：1
作者：
Benallal, A. [1 ]
Berstad, T. [2 ,3 ,4 ]
Borvik, T. [2 ,3 ,5 ]
des Codes, R. Nogueira [1 ]
Hopperstad, O. S. [2 ,3 ]
机构：
[1] LMT Cachan, Lab Mecan & Technol, F-94235 Cachan, France
[2] NTNU, Struct Impact Lab SIMLab, NO-7491 Trondheim, Norway
[3] NTNU, Dept Struct Engn, NO-7491 Trondheim, Norway
[4] SINTEF Mat & Chem, N-7465 Trondheim, Norway
[5] Norwegian Def Estates Agcy, Dept Res & Dev, NO-0015 Oslo, Norway
来源：
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING | 2011年 / 19卷 / 01期
关键词：
FINITE-ELEMENT SIMULATIONS; POLYCRYSTAL PLASTICITY; LOCALIZATION; FLOW; INSTABILITIES;
D O I：
10.1088/0965-0393/19/1/015007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Loss of ellipticity of the time-discretized boundary-value problem for elastic-viscoplastic solid materials with negative strain-rate sensitivity (SRS) is studied. The physical mechanism responsible for the negative SRS is assumed to be dynamic strain ageing. For the time-discretized problem the negative SRS translates into softening and may possibly lead to loss of ellipticity when the time step is greater than a critical value. The paper provides a method to compute the critical time step and illustrates the results for an aluminium alloy.
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页数：15
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