Notifications
Clear all

Determination of viscoelastic parameters (Prony or relaxation test data)


Kate19
Posts: 1
Topic starter
(@kate19)
New Member
Joined: 7 months ago

Hi all, I need to have my FE model improved with viscoelasticity. I have searched ABAQUS documentation and read some publications, but still have some questions as followed:

1. Polymer samples have been tested in tension with a constant elongation and a 10mins dwell time. This is regarded as one step and stress relaxation repeated many times in the test. Now curves of strain-stress and time-stress are gained, but I have no idea how to get the viscoelastic parameters.

2. Relaxation test data is considered in the beginning since I have done some relaxation tests. I then found there are shear test data and volumetric test data which obviously are not suitable. Maybe Prony should be used and, I should do curve fitting according to the equations of g_i and k_i? In my case the tau_i should be a constant of 10 mins.

 

I am new to this topic and really confused with it. Thank you all!

Thank you all!

2 Replies
Jorgen
Posts: 3955
Moderator
(@jorgen)
Member
Joined: 3 years ago

I recommend that you use the MCalibration license to calibrate a suitable viscoelastic material model. You can download a free trial license here: https://polymerfem.com/free-trial-license/

You should be able to calibrate a basic linear viscoelastic material model to your data.

/Jorgen

Reply
1 Reply
shabnam.kiasat
(@shabnam-kiasat)
Joined: 5 months ago

New Member
Posts: 1

@jorgen 

Dear Jorgen,

I am trying to convert storage modulus and loss factor to Prony parameters. Do you have any tips?

thank you in advance,

Shabnam

Reply
Share: