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#Post TitleResult InfoDateUserForum
Bergstrom Boyce Model in Abaqus explicit  16 Relevance9 years agoKinsy2324Bergstrom-Boyce Model
  Hello to all, After the determination of the parameter of Bergstrom boyce, I will use their (*Hysteresis) in abaqus explicit. But the post treatment shown an error THIS KEYWORD IS NOT AVAILABLE IN Abaqus/Explicit. Please, how i can fend this problem!! what is the idea??
The Bergstrom-Boyce Model: Experiments & Predictions  16 Relevance15 years agoJorgenFinite Element Modeling
  [IMG] [/IMG] I have made available a pdf-file ([URL= ]Bergstrom_Boyce_model1.pdf[/URL]) that discusses representative experimental data for elastomeric materials and how the observed non-linear strain, strain-rate, and hysteretic behavior can be modeled using the Bergstrom-Boyce (BB) model.
Bergstrom-Boyce Model Theory  16 Relevance15 years agoJorgenBergstrom-Boyce Model
  This pdf-file is a draft working document that describes the foundation and implementation of the Bergstrom-Boyce model for predicting the behavior of rubber elastic materials. The final version of this document is published in J. Mech. Phys. Solids, Vol 46, pp. 931-954, 1998.
elastomers - strain dependent behaviour ABAQUS  14 Relevance13 years agoJorgenElastomers
  Great Thesis Anders! The Bergstrom-Boyce (*Hysteresis) model captures qualitatively both the strain amplitude and the frequency response of elastomers. It does not, however, do a great job of qualitatively predicting the response for industrially relevant applications. The good news is that the Bergstrom-Boyce model can easily be extended to better capture the dynamic response. I have developed model that does this nicely - the Dynamic-Bergstrom-Boyce model. This model is commercially [URL= ]available[/URL]. Send me an email if you are interested. -Jo ...
MSC MARC Implementation of BB material model  12 Relevance7 years agofanggdBergstrom-Boyce Model
  Hi, what i found out so far is the following: Arruda-Boyce-Constants for Network B: [B]MARC nkT[/B] is the same as [B]mu_B[/B] (initial shear modulus) found in the papers [URL= ]here[/URL]. [B]MARC Chain Length[/B] is the same as sqrt(stretch_lock), where stretch_lock is the stretch where the chains begin to lock the stress strain behaviour. For the parameters of the evolution law just read the papers in the link above: Multiplier = hat{C}, Exponent = c, Stretch sensitivity = m. There is barely any documentation inside Marc regarding Arruda-Boyce and Bergstroem-Boyce and especially their implementations, just a sample data set: Multiplier: 1.75 Exponent: -1 Stretch Sens.: 4 Maybe you could post your experiences with this model, i would be really interested! Good luck and best regargs, Andreas EDIT: I have to correct the definition of the Multiplier - it is hat{C}/(sqrt(2)^m). Found it somewhere in the Docs of Mentat 2015.
weakness of the Arruda-Boyce model in Abaqus?  12 Relevance17 years agoJorgenConstitutive Models
  ... model for glassy polymers. The 8-chain model is implemented in ABAQUS, but the Arruda-Boyce viscoplasticity model is not implemented in ABAQUS. Some years ago I developed a model with M.C. Boyce that is now implemented in ABAQUS. This model is often called the Bergstrom-Boyce (BB) model, and can be activated in ABAQUS using the *Hysteresis command. The BB model was developed for elastomer-like materials. The Hybrid model (HM) is a a new advanced model for thermoplastics that is not available in ABAQUS. I also recently developed a model for predict ...
Can't use calibrated PolyUMod Bergstrom-Boyce for FE simulations  12 Relevance7 months agoabetosamBergstrom-Boyce Model
  Hi all, I was able to calibrate the BB model to my data. I have 3 curves at different strain rates all coming from uniaxial tension experiments. The model seems to fit the data great, but it always fails whenever I try to run the validation for FE simulation. I try changing the solver from default to Abaqus when doing that I can't even get it to run. Additionally, I exported the model as a script and imported it into Abaqus but whenever I run a job I get deformation on the material although the stresses are zero. Another thing that I checked is the units, I set my units to be micro newtons for force and micrometers squared for length which matches my experimental data where my stresses are in MPa. But for some reason, I get values of the order 10^-6 in my stresses. This only happens in the graph, if I edit the data it does come out to what I had input. What am I doing wrong here? I am new to all of this, and any help would be greatly appreciated. I've attached some pictures that might be helpful please let me know if any other details are necessary.
RE: Constitutive model of BERGSTROM-BOYCE MODEL  12 Relevance3 years agozci89Constitutive Models
  Hello Frank @FrankMonkey , i am very interested in BB model. I kindly ask you to send me also the subroutine files. Please send them via zub.ciprian@yahoo.com Regards, Ciprian
RE: Network B in Bergstrom-Boyce Model  12 Relevance3 years agoJorgenBergstrom-Boyce Model
  Thanks for the images. I am starting to understand your question. You are right, the F tensor can be determined from the applied strain (well, at least the F_11). The way to determine the Fe tensor is from: That is, you need to first calculate the Fp tensor (from the flow rate equation), and then you can calculate the Fe tensor. -Jorgen
RE: Network B in Bergstrom-Boyce Model  12 Relevance3 years agokate_jelaineBergstrom-Boyce Model
  Hello Jorgen, Thank you for your response. In regards to the Fe tensor, I am having difficulty understanding where to take data from. In particular, I am utilizing the (2005) paper to try and replicate your stress-strain plots for PTFE at -53 C. While using the BB model, network B calls for the 8-chain model (same as network A) except now the Fe deformation matrix is being used. I am not exactly certain how to get this tensor. I am using the function Grabit in MATLAB to get data from the plots in order to try and replicate them via the BB model. When I attempt to model this data in MATLAB, my plot does not look as it should and I think the issue revolves around the deformation matrices. Hopefully that gives a little more specificity for the question. Attached are the plots I am attempting to replicate. FIGURE 1: I am pulling data from the -53 C curve and using the true strain to form the F tensor. FIGURE 2: Pulling data from this curve to generate Fe matrix? FIGURE 3: My plots from MATLAB
RE: Network B in Bergstrom-Boyce Model  12 Relevance3 years agoJorgenBergstrom-Boyce Model
  Hello Kate - Welcome to the forum ? I am not sure I fully understand your question. If your goal is to calibrate (find) the BB model parameters that match some experimental data, then I would recommend you using the MCalibration software. It is very easy to use, and you can get a free trial license by clicking on the button on the front page of PolymerFEM.com If your goal is to create your own implementation of the BB model then I recommend that you read my Polymer Mechanics book, which contains (I think) a Python implementation of the BB model. If you have a specific question about the Fe tensor, then can you please provide a bit more details here? -Jorgen
RE: Bergstrom Boyce Model and VUMAT subroutine  12 Relevance3 years agoJorgenBergstrom-Boyce Model
  Can you check your input file? It should have worked.
RE: Bergstrom Boyce Model in Abaqus explicit  12 Relevance3 years agoJorgenBergstrom-Boyce Model
  Just perform the dynamic model as usual, except that you specify the material model you like to use (*Hysteresis, PRF, PolyUMod). -Jorgen
RE: Constitutive model of BERGSTROM-BOYCE MODEL  12 Relevance3 years agoMellyConstitutive Models
  Frank, I am very much interested in those resources for BB model. It will boost my already picking momentum in learning polymer mechanics. If you don't mind, kindly send me via my email: melliesons@gmail.com Regards, Melly
Bergstrom Boyce model for thermoplastics  12 Relevance7 years agodvhudson08Thermoplastics
  I was wondering if there is a way to use BB model to simulate thermoplastics. If yes then how to account for poisson ratio? Will it be via Incompressibilty parameter d? Thanks!
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