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» Current Poll
What Hyperelastic constitutive model do you use?
Neo Hookean - 27.78%
5 Votes
Arruda-Boyce (8-chain) - 11.11%
2 Votes
Ogden - 33.33%
6 Votes
Mooney-Rivlin - 22.22%
4 Votes
Yeoh - 16.67%
3 Votes
Marlow - 16.67%
3 Votes
I use some other hyperelastic model - 5.56%
1 Vote
Never use hyperelastic models - 11.11%
2 Votes
Total Votes: 18
You may not vote on this poll.
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info This site is an independent forum for discussing constitutive models for polymers and their implementation in general purpose finite element programs. What you will find here are general information about material behavior, useful constitutive models, and numerical implementations. The goal of this site is to become a useful reference for constitutive models for polymers. Researchers and users are encouraged to submit results and to request information.
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Presentation: Advanced Modeling of UHMWPE
2008-11-02 - by Jorgen

I recently gave a presentation titled: "An Advanced Thermomechanical Constitutive Model for UHMWPE" at the Society of Engineering Science (SES) annual technical meeting. In this presentation I discussed a new material model framework for thermoplastic materials that aims to be both accurate and numerically efficient. The presentation can be downloaded from the attached link.

In... [Read More]
0 Replies | 307 Views
Polymer FE Modeling Training Class - Fall 2008
2008-08-05 - by Jorgen


Do you perform FEA of polymer components but don't know the tradeoffs, pitfalls, and benefits of different constitutive models, modeling options, and material test methods?

Do you want to get a competitive advantage by using more advanced and accurate FEA techniques?

Then attend the two-day training seminar that I will be giving in San Francisco, November... [Read More]
1 Reply | 730 Views
how can use Vumat to simulate the ductile fracture criterion of Oyane
2008-06-08 - by ductoan_bkct@yahoo.com
Dear Dr. Jorgen Bergstrom and everybody

I have just studied Abaqus and would like to use Vumat to simulate the ductile fracture criterion of Oyane which have the equation: I=(1/b)*integral(0-fracture strain) of (mean stress/Smises stress + a)*d(strain), where a, b is testing parameters. The fracture will be appear when I reach 1 unit.
Could you please show me how to write algorithm to calculate (I) and out put (I) in Vumat.

thanks you so much

... [Read More]
5 Replies | 1,120 Views
Howto Install ABAQUS on Ubuntu 8.04 (including support for UMAT subroutines)
2008-04-24 - by Jorgen
If you are running the finite element program Abaqus you might be interested in learning that it is not too difficult to install it on the latest version of Ubuntu Linux 8.04. There are probably different ways to install Abaqus so that you can run any computer simulation, including user-material models (UMAT and VUMAT) subroutines.

Here are the steps that I took to install the Abaqus v6.7-EF on a i386 computer running Ubuntu 8.04:

1. Copy all files from the... [Read More]
11 Replies | 2,820 Views
Dynamic Loading Elastomers - Constitutive Modeling Review
2008-04-24 - by Jorgen
I will be giving a presentation about how to perform accurate finite element simulations of the dynamic loading response of elastomers and rubbers at the upcoming 2008 Abaqus Users' Conference. My presentation will review how different constitutive models such as hyperelasticity (neo-Hookean), linear viscoelasticity, and the Bergstrom-Boyce model, can predict the storage modulus E' and the loss modulus E" as a... [Read More]
0 Replies | 1,019 Views
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