• MCalibration
    • Overview
    • Quick Tutorial
    • Free Trial License
    • Software Download
  • PolyUMod
    • Overview
    • PolyUMod Material Database
    • Free Trial License
    • Software Download
    • Bergstrom-Boyce (BB) Model
    • Three Network (TN) Model
    • Three Network Viscoplastic (TNV) Model
  • Blog
    • All Blog Posts
    • MCalibration
    • Experimental Testing
    • Theory
    • FE Examples
    • PolyUMod Abaqus
    • PolyUMod Ansys
    • PolyUMod LS-DYNA
    • PolyUMod COMSOL
    • PolyUMod Radioss
    • PolyUMod MSC.Marc
  • Forum
  • Store
  • Support
    • Help Documents
    • Training Classes
    • Polymer FEA Book
    • Contact Us
    • Software Download
    • Register
    • Login
    • Logout
Menu
  • MCalibration
    • Overview
    • Quick Tutorial
    • Free Trial License
    • Software Download
  • PolyUMod
    • Overview
    • PolyUMod Material Database
    • Free Trial License
    • Software Download
    • Bergstrom-Boyce (BB) Model
    • Three Network (TN) Model
    • Three Network Viscoplastic (TNV) Model
  • Blog
    • All Blog Posts
    • MCalibration
    • Experimental Testing
    • Theory
    • FE Examples
    • PolyUMod Abaqus
    • PolyUMod Ansys
    • PolyUMod LS-DYNA
    • PolyUMod COMSOL
    • PolyUMod Radioss
    • PolyUMod MSC.Marc
  • Forum
  • Store
  • Support
    • Help Documents
    • Training Classes
    • Polymer FEA Book
    • Contact Us
    • Software Download
    • Register
    • Login
    • Logout
Search
Close
Login Using Old Accounts All old passwords were reset when this site was migrated to WordPress. You can change your password by clicking on the "Login" item in the "Support" menu, and then selecting "Lost your password".
  • Home
  • Forums
  • Members
  • Recent Posts
Forums
Search
 
Notifications
Clear all

Search result for:  Bergstrom-Boyce

 Search Phrase:
 Search Type:
Advanced search options
 Search in Forums:
 Search in date period:

 Sort Search Results by:


Page 2 / 7 Prev Next
# Post Title Result Info Date User Forum
Bergstrom Boyce Model in Abaqus explicit   17 Relevance 7 years ago Kinsy2324 Bergstrom-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   17 Relevance 14 years ago Jorgen Finite Element Modeling
  [IMG] [/IMG] I have made available a pdf-file ([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   17 Relevance 14 years ago Jorgen Bergstrom-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. Attachment:Bergstrom_Boyce_model1.pdf
elastomers - strain dependent behaviour ABAQUS   15 Relevance 11 years ago Jorgen Elastomers
  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= Send me an email if you are interested. -Jorgen
MSC MARC Implementation of BB material model   14 Relevance 5 years ago fanggd Bergstrom-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= [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?   14 Relevance 15 years ago Jorgen Constitutive 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 ...
Accurate material model for Teflon   13 Relevance 7 years ago kale496 Thermoplastics
  [QUOTE=ravishankar,11427]I am trying to find material parameters for Teflon with simple tension data (multiple cyclic loading at different temperatures). From Mcalibration, the following models are available - Bergstrom Boyce, Bergstrom Boyce Mullins, Dual Network Fluoropolymer, Three Network Model, Hybrid Model. Out of all these, BBM seems to give the best fit of 0.89 (R2). However, DNF, which was specifically made for Teflon in Bergstrom and Hilbert paper gives a fit of only 0.72. TNM and BB give lesser than BBM (around 0.78). 1. So, how to decide which model is best ? 2. Also, is it possible by the user to adjust the values of parameters to improve the fitness or is it that whatever the optimization results are the best one could get (implying that material model itself is not accurate)? -Ravishankar[/QUOTE] Teflon is the brand name of a compound discovered by Roy J. Plunkett (1910-1994) of DuPont in 1938 and introduced as a commercial product in 1946. Teflon is polytetrafluoroethene (PTFE).Teflon is also used as the trade name for a polymer with similar properties, perfluoroalkoxy polymer resin (PFA).
Accurate material model for Teflon   13 Relevance 7 years ago Krisandersen Thermoplastics
  I am trying to find material parameters for Teflon with simple tension data (multiple cyclic loading at different temperatures). From Mcalibration, the following models are available - Bergstrom Boyce, Bergstrom Boyce Mullins, Dual Network Fluoropolymer, Three Network Model, Hybrid Model. Out of all these, BBM seems to give the best fit of 0.89 (R2). However, DNF, which was specifically made for Teflon in Bergstrom and Hilbert paper gives a fit of only 0.72. TNM and BB give lesser than BBM (around 0.78). 1. So, how to decide which model is best ? 2. Also, is it possible by the user to adjust the values of parameters to improve the fitness or is it that whatever the optimization results are the best one could get (implying that material model itself is not accurate)? -Ravishankar
Help ansys designations   13 Relevance 11 years ago jrw5001 Constitutive Models
  ... as: TB, BB, 1, , , ISO !Activate Bergstrom-Boyce ISO data table TBDATA, 1, 1.31 !Define material constant μ,A , TBDATA, 2, 9.0 !Define N0=(λ,Alock)2 TBDATA, 3, 4.45 !Define material constant μ,B TBDATA, 4, 9.0 !Define N1=(λ,Block)2 TBDATA, 5, 0.33 !Define material constant TBDATA, 6, -1 !Define material constant c TBDATA, 7, 5.21 !Define material constant m ! TB, BB, 1, , , PVOL !Activate Bergstrom-Boyce PVOL data table T ...
Doubt about Elastomers   13 Relevance 12 years ago ghazel Constitutive Models
  ... the downloadable-documents related to the Bergstrom-Boyce Model in the Forum and it does look like the most enriched model for elastomers ... I have a few general questions:[/COLOR] [B] [COLOR=Red]1 )Are there any published literature which utilizes the Abaqus/LS-Dyna implementation of the Advanced Bergstrom-Boyce Model ? 2) Whats the acquisition process & price of Poly-UMOD Library? 3) Are there any Open-Access or Evaluation versions of the same?[/COLOR] [/B] Regards, Sban
RE: Constitutive model of BERGSTROM-BOYCE MODEL   13 Relevance 12 months ago zci89 Constitutive 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   13 Relevance 1 year ago Jorgen Bergstrom-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   13 Relevance 1 year ago kate_jelaine Bergstrom-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. Attachment:PTFE Stress Strain.PNG Attachment:PTFE Relazation Time.PNG Attachment:BB plot.jpg 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   13 Relevance 1 year ago Jorgen Bergstrom-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   13 Relevance 1 year ago Jorgen Bergstrom-Boyce Model
  Can you check your input file? It should have worked.
Page 2 / 7 Prev Next

Forum Search

Recent Posts

  • RE: Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    You can find an updated VUMAT posted on this website he...

    By twhohen, 2 days ago

  • RE: Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    Hi everyone, I am simulating flexural RC beam strengt...

    By Chhorn buntheng, 2 days ago

  • RE: Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    In that case you may be able to use gfortran (which is ...

    By jbRektor, 1 week ago

  • RE: Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    I am using ABAQUS 6.13. I am unable to get Intel fortra...

    By mzohebnawaz, 1 week ago

  • RE: Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    I'm happy to help. The basic steps are as follows: ...

    By jbRektor, 1 week ago

  • Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    Hello Everyone, I am new to Hyperelastic materials, I...

    By mzohebnawaz, 1 week ago

  • RE: How to plot UEL results?

    I have not worked with with UEL routines in a long time...

    By Jorgen, 2 weeks ago

  • RE: Creating an "own" Abaqus-Template as a button?

    Unfortunately, it is currently not possible to add user...

    By Jorgen, 2 weeks ago

  • RE: Is it possible to add "own" virtual loadcases to the list?

    Hello Eskil, It is currently not possible to add your...

    By Jorgen, 2 weeks ago

Topic Tags

  • Abaqus18
  • material model16
  • MCalibration9
  • BB-model9
  • Hyperelastic7
  • UMAT6
  • VUMAT6
  • ANSYS3
  • PolyUMod3
  • Rubber2
  • Ogden Foam2
  • Biaxial Tension2
  • Bergstrom-Boyce2
  • HDPE2
  • eight-chain2
  • Arruda-Boyce2
  • modeling2
  • TN2
  • Prony series2
  • CentOS2
View all tags (111)

Recent Topics

  • Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

    By mzohebnawaz, 1 week ago

  • Creating an "own" Abaqus-Template as a button?

    By Pablo_1, 2 weeks ago

  • Is it possible to add "own" virtual loadcases to the list?

    By Pablo_1, 2 weeks ago

  • Error in installation of MCalibration software

    By Pratik28, 3 weeks ago

  • PolymerFEM now has its own Youtube channel!

    By jbRektor, 3 weeks ago

  • How to plot UEL results?

    By I.Cabeza, 3 weeks ago

  • Tutorials?

    By Pablo_1, 3 weeks ago

  • Uni-axial tension used for plastic bearing material.

    By ZMM, 4 weeks ago

  • Comparing material models

    By Pablo_1, 4 weeks ago

Share:
  Forum Statistics
21 Forums
3,752 Topics
12.9 K Posts
1 Online
22.6 K Members

Latest Post: Understanding VUMAT code written in Mechanics of Solid polymers Textbook. Our newest member: Andrewjulty Recent Posts Unread Posts Tags

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

SOFTWARE
  • MCalibration
  • PolyUMod
  • Partnerships
  • Store
RESOURCES
  • Blog
  • Forum
  • Training Classes
  • Polymer FEA Book
SUPPORT
  • FAQ
  • Installation Guides
  • Contact Us
ABOUT
  • About Us
  • Price Information
  • Careers
  • Privacy Policy
SUBSCRIBE TO OUR NEWSLETTER

Copyright @ 2021 PolymerFEM.com. All rights reserved.