Jorgen
2007-08-28, 21:40
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If your work involves finite element simulations of polymeric materials then you have probably noticed that the commercial FE codes do not have virtually any material model that can be used to accurately predict the general deformation behavior of polymers.
The three main options that are typically available in FE codes are:
hyperelasticity
linear viscoelasticity
metal plasticity
The hyperelasticity and the metal plasticity models can be used for large deformations, but do not provide deformation-rate and temperature effects. Furthermore, the metal plasticity models do not provide accurate multiaxial predictions for polymers, and linear viscoelasticity is only accurate for very small deformations.
Fortunately, there is a way around this problem, making it possible to perform accurate FE predictions of polymers...
The solution is to use an advanced user material subroutine. All of the major FE packages allow for the use of an external file containing the definition of new material models.
A lot of progress has occurred in the polymer mechanics research community during the last few years, and I have through my research and consulting work taken some of the best constitutive models that have been developed and coded them into different user subroutines. A list of user subroutines that I have made available is shown on the user materials page (http://polymerfem.com/cmps_index.php?pageid=umats).
If your work involves finite element simulations of polymeric materials then you have probably noticed that the commercial FE codes do not have virtually any material model that can be used to accurately predict the general deformation behavior of polymers.
The three main options that are typically available in FE codes are:
hyperelasticity
linear viscoelasticity
metal plasticity
The hyperelasticity and the metal plasticity models can be used for large deformations, but do not provide deformation-rate and temperature effects. Furthermore, the metal plasticity models do not provide accurate multiaxial predictions for polymers, and linear viscoelasticity is only accurate for very small deformations.
Fortunately, there is a way around this problem, making it possible to perform accurate FE predictions of polymers...
The solution is to use an advanced user material subroutine. All of the major FE packages allow for the use of an external file containing the definition of new material models.
A lot of progress has occurred in the polymer mechanics research community during the last few years, and I have through my research and consulting work taken some of the best constitutive models that have been developed and coded them into different user subroutines. A list of user subroutines that I have made available is shown on the user materials page (http://polymerfem.com/cmps_index.php?pageid=umats).