Improvement to plastic material models

Numerical methods and mathematical models of Elmer
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kevinarden
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Improvement to plastic material models

Post by kevinarden »

I have made improvements to the plastic material models, better convergence and results.
results.png
results.png (23 KiB) Viewed 892 times
the red and yellow curves overlay.

Added hencky_stvenant_kirchhoff bi-linear plastic model for large strains, improved bi-linear model for small strains.
Added an orthotopic model, not plasticity, but E can be specified in each direction.

Put all of the models into one MatLIb, description file
materialLIBS.txt
(976 Bytes) Downloaded 55 times
Library F90
myUMATLib.F90
(72.21 KiB) Downloaded 50 times
I did
elmerf90 myUMATLib.f90 -o myUMATLib

then copied myUMATLib to /usr/lib/elmersolver to make it available from any directory, you can also put it in the current directory.
Last edited by kevinarden on 26 Dec 2019, 13:13, edited 3 times in total.
kevinarden
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Re: Improvement to plastic material models

Post by kevinarden »

Example sif files
bilinear.sif
(2.53 KiB) Downloaded 69 times
hskbi.sif
(2.53 KiB) Downloaded 67 times
ortho.sif
(2.52 KiB) Downloaded 67 times
kevinarden
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Re: Improvement to plastic material models

Post by kevinarden »

Further testing lead to improvements in bi-linear and bi-linear hencky_stvenant_kirchhoff
results.png
results.png (40.37 KiB) Viewed 875 times
myUMATLib.F90
(72.21 KiB) Downloaded 67 times
Attachments
materialLIBS.txt
(976 Bytes) Downloaded 50 times
annier
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Re: Improvement to plastic material models

Post by annier »

kevinarden wrote: 20 Dec 2019, 23:43 Example sif files

bilinear.sif
hskbi.sif
ortho.sif
Dear Kevinarden ,
I just noticed that the hskbi.sif file uses the subroutine "bilinear" instead of "hsk_bi " in the myUMATLib.F90 file.


Yours Sincerely,
Anil Kunwar
Anil Kunwar
Department of Materials Engineering, KU Leuven, Belgium
kevinarden
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Re: Improvement to plastic material models

Post by kevinarden »

Thanks I will check it
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