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A guide to using material model No. 11 in NIKE2D [electronic resource] : An internal variable, viscoplasticity model

Published
Washington, D.C : United States. Dept. of Energy. Office of the Assistant Secretary for Defense Programs, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (19 pages) : digital, PDF file
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy. Office of the Assistant Secretary for Defense Programs, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The need to accurately model the superplastic forming process which is highly rate and temperature dependent motivated the evaluation of Bammann's internal variable, viscoplasticity material model. The model is based upon the concepts of unified creep plasticity, but employs a yield surface for efficient implementation into large-scale numerical computer codes. It has proven elsewhere to be quite successful in describing large strain, thermal-mechanical behavior of crystalline materials. Features of the model enable it to simulate the apparent strain-rate behavior exhibited by many metals above one half the melt temperature. It is the efficient incorporation of features that make the model attractive for use in finite element modeling of metal deformation processes. Although this model was implemented into the Lawrence Livermore National Laboratory's NIKE2D finite element program in 1986, there have been no known reports of successful use by NIKE2D users. The purpose of this report is to provide the user the proper format to input model parameters, a procedure for determining appropriate values for material constants from experimental data, and supplemental information on the model relevant to the implementation in the NIKE2D finite element program. Detailed accounts of the theoretical aspects of the model can be found in the cited references. 4 refs., 8 figs.
Report Numbers
E 1.99:ucrl-id-105245
ucrl-id-105245
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/30/1990.
"ucrl-id-105245"
"DE91002570"
Nikkel, D.J. Jr.; Flower, E.C.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14064230