Jorgen
2007-08-28, 19:06
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If you are interested in performing advanced finite element modeling (FEM) of polymer components or systems then you most likely aware that the built-in capabilities of the commercial finite element packages are not always satisfactory. One particular problem is the lack of accurate and general constitutive models for polymers. This problem, fortunately, can in many of the commercial packages (e.g. ABAQUS, LS-DYNA) be solved by using an external user material subroutine, typically written in Fortran.
Writing a user material subroutine takes considerable expertise and is mostly done in academic environments. A number of commercially available subroutines specifically developed for certain materials have become available during the last year or so. These models can enable significantly more accurate simulation results and therefore provide substantial value to modeling and analysis efforts.
Two examples of available external subroutines are for: elastomers (http://polymerfem.com/polymer_files/UMAT_elastomers.pdf) and polymer foams (http://polymerfem.com/polymer_files/UMAT_foam.pdf). These material models can be used as easily as the already built-in material models.
If you are interested in performing advanced finite element modeling (FEM) of polymer components or systems then you most likely aware that the built-in capabilities of the commercial finite element packages are not always satisfactory. One particular problem is the lack of accurate and general constitutive models for polymers. This problem, fortunately, can in many of the commercial packages (e.g. ABAQUS, LS-DYNA) be solved by using an external user material subroutine, typically written in Fortran.
Writing a user material subroutine takes considerable expertise and is mostly done in academic environments. A number of commercially available subroutines specifically developed for certain materials have become available during the last year or so. These models can enable significantly more accurate simulation results and therefore provide substantial value to modeling and analysis efforts.
Two examples of available external subroutines are for: elastomers (http://polymerfem.com/polymer_files/UMAT_elastomers.pdf) and polymer foams (http://polymerfem.com/polymer_files/UMAT_foam.pdf). These material models can be used as easily as the already built-in material models.