Dynamic analysis of a viscoelastic material in Abaqus

[dasilva_esp]

Hello mates. I need assistance on Abaqus.
I want to simulate a impulse force in a composite plate with damping
and on the same plate but adding a layer of viscoelastic material and
compare the temporal evolution of motion both cases. After reading the
manual I do not know how to introduce the viscoelastic material and how
to make a dynamic analysis taking into consideration the damping and
introducing impulsive force. If you have an example appreciated if
you send me. Thanks for your help

[Jorgen]

I don't have an example to send :(
but you can introduce linear viscoelastic damping rather easily using for example CAE.

-Jorgen

[dasilva_esp]

Thanks Jorgen !
How I can send you the model I have to give me your opinion?

[Jorgen]

You can attach files to messages on this forum. But if possible, I generally recommend describing problems in words instead of attachments since it can take a long time to review files :(

-Jorgen

[dasilva_esp]

Thaks Jorgen, I will try!

I want to know the response in time of a plate with a Viscoelastic material between two CFRP layers when a inpulsive load is applied using Abaqus.
1. I define the viscoelastic material in material module with:
a) Elastic (E, Nu)
b)Viscoelastic (Prony Series in time domain; g_i prony ,tau_i prony,K_i prony)
c) Density
d) Damping only using alpha


2. Steps

a) The initial in Abaqus
b) Step Visco with a duration of 0.5 s (the impulsive load is applied in this step)
c) Step Dynamics implicit with a duration of 10 s

What do you think about it? any suggestions? The problem is that I don´t know if this is correct because
there is no example and everyone has doubts about this.
Thaks again !

[Jorgen]

I think it sounds great. The only thing I am unsure about is if the built-in linear viscoelastic material model can be used with Dynamic Implicit. You can always give it a try and read to dat-file for warning message (or just read the User's Manual).

-Jorgen

[dasilva_esp]

Dr. Jorgen

Now I would like to simulate the cork as a viscoelastic material in Abaqus.
I will use Proni Series. But the problem are

1) Prony in time domain or in frequency domain?
2) how do I get the coefficients ?
3) what tests should I have to do?


Thank you very much !

[Jorgen]

You may want to run a few stress relaxation experiments in order to get the Prony series, and then run one or more tension tests to get the hyperelastic response.

[ATHMANE]

HI, sorry i am here for the first time, i want to know an exampl for the viscoelastic parameters or constants like (----a) Elastic (E, Nu)
b)Viscoelastic (Prony Series in time domain; g_i prony ,tau_i prony,K_i prony)
c) Density
d) or K*1,k*2,G*1,G*2,a,b
just the values i mean i want to get example.

thank you very much !