[Solved] Constitutive model of BERGSTROM-BOYCE MODEL

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

Hello

I can refer to sources for the Bergstrom model:

1) [url] https://polymerfem.com/polymer_files/UMAT_subroutines.html [/url]

2) [url] https://polymerfem.com/polymer_files/vumat_nh/ [/url]

3) Regrettably Simulia has switched off an extremely useful resource that was known as custhelp. The following could be found there:

-------------------------------------------

Answer ID 4800

Abaqus/Explicit VUMAT for Bergstrom-Boyce polymer hysteresis model

(The following applies to Abaqus 6.10 and higher)

Attached below is an Abaqus/Explicit VUMAT for the simulation of hysteretic behavior in polymeric materials. Documentation and an example input file are also attached.

Note that this user subroutine is offered freely, and is not part of the regular licensed Abaqus software suite.

File Attachments

PDF document Abaqus Explicit VUMAT for Hysteresis.pdf

HTML document vumat-hysteresis.for

HTML document hysteresis.inp

-------------------------------------------

These files are uploaded here. The inp and for are declared to be pdf as the site didnt like to upload inp and for files.

For subroutine beginners: Get the file

[url] http://imechanica.org/files/Writing [/url] User Subroutines with ABAQUS.pdf

Good luck

Frank