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#Post TitleResult InfoDateUserForum
Updated Bergstrom-Boyce model  30 Relevance16 years agoJorgenFinite Element Modeling
  A new document discussing the Bergstrom-Boyce (BB) model is now available for download. his file discusses an updated version of the Bergstrom-Boyce (BB) model that improves the predictions of cyclic loading and simplifies the numerical implementation of the model. The title of the document is: Constitutive Modelling of the Time-Dependent and Cyclic Loading of Elastomers and Application to Soft Biological Tissues Abstract: The stress-strain behavior of both elastomeric materials and soft biological tissues exhibits time-dependence and hysteresis when subjec ...
Bergstrom-Boyce Model Info  25 Relevance14 years agoJorgenFinite Element Modeling
  [IMG] [/IMG] If you are interested in learning more about the Bergstrom-Boyce (BB) model, which is now a built-in feature of both Abaqus and ANSYS, then you should consider checking out the Bergstrom-Boyce model [URL= ]page[/URL] on [URL= ]PolymerMechanics.com[/URL]. The Bergstrom-Boyce model is a really cool model that works very for predicting the strain-rate dependence and hysteresis or elastomer-like materials. Since I developed this model as part of my Ph.D. work at M.I.T, I might be slightly biased 😎 The [URL= ]PolymerMechanics.com[/URL] web site ...
Bergstrom-Boyce Model  21 Relevance16 years agoJorgenUser Material Subroutines
  The augmented Bergstrom-Boyce model is an advanced material model that can accurately predict the large-strain time and temperature dependent behavior of both filled and unfilled elastomers. A modified version capable of quantitatively capturing the behavior of Teflon and other fluoropolymers is also available. This document summarizes some of the basic features of the augmented Bergstrom-Boyce model.
Fitting Bergstrom Boyce Parameters in LS-DYNA  19 Relevance8 years agokrzysiek_krzysiekFinite Element Modeling
  Hello, Im interested in fitting the Bergstrom-Boyce model in LS-DYNA using experimental data. The experimental data includes uniaxial compression and tension stress-strain curves, at multiple strain rates (0.01/s, 1/s, 10/s, and 50/s). Can anyone help explain how I would go about doing this in MATLAB? Im also open to other material models, including Arruda-Boyce, Ogden, or MAT_181 which would allow me to simulate rate effects. Best, Connor Pyles
ANSYS 12: Bergstrom-Boyce Model  19 Relevance14 years agoJorgenFinite Element Modeling
  I just learned that ANSYS 12 now has [URL= ]built-in[/URL] support for the Bergstrom-Boyce model. This happens to be a model that I developed a few years ago when I was at MIT and worked with Professor Mary Boyce. I would be curious to hear peoples comments on how the ANSYS implementation of this model is working. Have anyone tried it out yet? I would be interested in hearing feedback on your experience! -Jorgen
Convergence problems with *HYSTERESIS  19 Relevance19 years agoJorgenFinite Element Modeling
  Hej Per, Visst r jag svensk, men jag bor sedan ett antal r i USA. I will write the rest in English, since you are asking some very good questions that other people might also be interested in. You are right: ABAQUS has implemented the Bergstrom-Boyce model into their software, and it is available through the *Hysteresis option. As you have noticed, there are some rather serious limitation with the [i]*Hysteresis[/i] option. For example, it is only available for ABAQUS/Standard and not ABAQUS/Explicit. In addition to this, I have noticed that the ...
ANSYS V12 Bergstrom  18 Relevance14 years agojrw5001Constitutive Models
  ... by ANSYS V12. My problem is in material definition, and I have full set of experimental data. I used three models (two cannot catch the hysteresis curve but I troubleshoot the convergence issue). 1. Model Yeoh, third order After the curve fitting the only material property required by ANSYS is density Problem converges very well 2. Model Ogden third order After the curve fitting again the density is required from ANSYS to run the analysis. Convergence is poor but this is a problem of implementation of Ogden model in ANSYS (poor curve fitting) 3. Be ...
Network B in Bergstrom-Boyce Model  16 Relevance4 years agokate_jelaineBergstrom-Boyce Model
  Hello, I am working on a continuum project attempting to implement the BB model for PTFE material. I am inquiring about Network B in this model. I am not certain where the Fe deformation matrix is coming from. It is not explicitly stated in Bergstrom, Boyce (2005) paper. I am trying to match the model to experimental data using MATLAB. Could anyone provide some assistance? Thank you, Kate
Constitutive model of BERGSTROM-BOYCE MODEL  16 Relevance9 years agoRobertApodacaConstitutive Models
  Hi, I am using ABAQUS to simulate the heat processing of viscoelastic material under a periodic loading. I saw it on the forum that it is proper to model it with a Bergstrom-Boyce MODEL. But I am new to constitutive model, and I want to use VUMAT to build the model. Is there any reference I can refer to? Thanks! Ziwei University of Michigan
Bergstrom Boyce Model for shock test  16 Relevance9 years agoKinsy2324Bergstrom-Boyce Model
  Hello to all, Hello Jorgen, I have one question: Can you use the Bergstrom Boyce model to simulate a Quick Shock test (small time)?
Accuracy of Bergstrom-Boyce Model at Very High Strain Rates  16 Relevance9 years agoeugenebraswellConstitutive Models
  Hello everyone, I was wondering how well the Bergstrom-Boyce model approximates material behavior when the material is subjected to extremely large strain rates, e.g. greater than 100 /s? Are there any references available which document this? I am looking to possible complete some SHPB tests and would like to use the data to calibrate the BB model. Thanks, Frank
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