Bergstrom Simulia Conference 2010

Sun, 20 Jun 2010 13:46:00 -0500

In May 2010, I gave a presentation at the Simulia User's Conference in Providence, RI. My talk had the title: "Finite Element Modeling of Thermoplastics at Different Materials". This is an area
in which I have extensive experience, and it is an topic that a lot of people have problems with.

In my presentation I used non-linear viscoelastic experimental data for a Polycarbonate (Lexan from SABIC Innovative Plastics). I then demonstrated that standard metal plasticity with rate dependence:

Three Network Model for Thermoplastics

Sun, 20 Jun 2010 13:18:00 -0500

I have developed a new advanced thermomechanical constitutive model for thermoplastic materials. In the new model the micostructure of the material is represented using three distinct structural domains that capture the experimentally observed non-linear, time- and temperature-dependent response at both small and large strains. The attached paper presents the theory for the model, and the model calibration and validation are exemplified by direct comparison with experimental data for UHMWPE.

Download the paper from this link.

Material Modeling of Bread Dough

Sat, 19 Jun 2010 21:41:00 -0500

Bread dough is quite an interesting material with many similarities in its mechanical response to a lightly crosslinked elastomer. That is perhaps not too surprising since bread dough contains a network of gluten molecules. I recently published a paper on how to accurately model the response of this interesting material using an anisotropic version of the Bergstrom-Boyce model with Mullins damage. The model that we developed has been shown to accurately capture the non-linear viscoplastic response of bread dough, and the model has been implemented in the PolyUMod library of user-material models for Abaqus and ANSYS.

PolymerFEM.com

Bergstrom Simulia Conference 2010

Three Network Model for Thermoplastics

Material Modeling of Bread Dough