User Material Subroutine for
Single Crystal Plasticity
A User Material (UMAT) subroutine that models the deformation of single
crystals which undergo plastic deformation can be downloaded. It is
suitable for use with the commercial finite element code ABAQUS. The
UMAT was originally written in 1991 by Yonggang (Young) Huang, now a
faculty member in mechanical engineering at the University of
Illinois, Urbana-Champaign, and was modified in 1997 by Jeffrey W.
Kysar, now a faculty member in mechanical engineering at Columbia
University,
New York. Both were in the research group of James R. Rice at Harvard
University at the time.
The authors assume no responsibility for errors or omissions in the
software or documentation available from this web site. Unfortunately
due to time constraints, the authors are not able to respond to
requests for assistance on using the software.
The bibliographic citations and download links explaining the work are:
Huang, Y. (1991). "A user-material
subroutine incorporating single crystal plasticity in the ABAQUS finite
element program, Mech Report
178", Division of Engineering and Applied Sciences, Harvard University,
Cambridge, Massachusetts.
Kysar, J. W. (1997). "Addendum
to 'A user-material subroutine incorporating single crystal plasticity
in the ABAQUS finite element
program, Mech Report 178'", Division of Engineering and Applied
Sciences, Harvard University, Cambridge, Massachusetts.
(Print copies of these reports are no longer available at Harvard.)
Click here to download a sample
ABAQUS input file for the UMAT. It is suitable for ABAQUS v5.6, however
recent versions of ABAQUS have
routines which will automatically update the input file to be suitable
for the current version.
Click here to download only the UMAT
Fortran code.
Last updated 6 March 2006.
Please send comments and report missing links to
jk2079@columbia.edu
.