Dynamic strain aging and related instabilities: experimental, theoretical and numerical aspects

被引：0
|
作者：
Benallal, A. [1 ]
Berstad, T. [2 ]
Børvik, T. [2 ,3 ]
Clausen, A.H. [2 ]
Hopperstad, O.S. [2 ]
机构：
[1] Laboratoire de Mécanique et Technologie, LMT-Cachan, 61, avenue du President-Wilson, 94235 Cachan cedex, France
[2] Structural Impact Laboratory - SIMLab, Department of Structural Engineering, NTNU, 7491 Trondheim, Norway
[3] Norwegian Defence Estates Agency, Research Development Department, Oslo Mil./Akershus, 0015 Oslo, Norway
来源：
European Journal of Mechanics, A/Solids | 1600年 / 25卷 / 03期
关键词：
Experimental data from uniaxial tensile tests on smooth and notched specimens of aluminium alloy 5083-H116 show that the material exhibits negative strain-rate sensitivity for strain rates within a certain range. The negative strain-rate dependence; which is attributed to dynamic strain aging; leads to serrated stress-strain curves; discontinuous plastic flow and propagating deformation bands during plastic straining (also denoted as the Portevin-Le Chatelier effect). Band analysis and linear perturbation analysis are performed using simple elastic-viscoplastic constitutive equations that include negative strain-rate sensitivity in a simplified manner. The negative strain-rate sensitivity allows for jumps in the plastic strain rate; which in turn permits the existence of localisation bands for the elastic-viscoplastic model. The simple elastic-viscoplastic constitutive model has been implemented in LS-DYNA; and non-linear finite element simulations of smooth and notched tensile test specimens are performed; allowing more detailed investigations into the effects of the negative strain-rate sensitivity on the material's behaviour. © 2005 Elsevier SAS. All rights reserved;
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页码：397 / 424
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