# Thread: Ansys - Young Modulus vs time

1. Junior Member
Join Date
2012-08
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1

## Ansys - Young Modulus vs time

I need to simulate a degradation of Young Modulus in a time. I need to use a equation to simulate the Young Modulus, for example E = E0 - D*substep/(total of substeps), where E0 = Young Modulus without degradation and D = percentual of degradation.

I'm using a concrete structure in the program ANSYS.

Can someone help me? My English is terrible, sorry!
Last edited by jonathas_salles; 2012-08-03 at 01:30.

2. Junior Member
Join Date
2013-02
Posts
2

## Time varying E in ansys

Hi,
I also have a similar prob. I am trying to do concrete creep modelling and it requires inputting a time varying Young's modulus in ANSYS.. Did you find a soulution to this?

Originally Posted by jonathas_salles
I need to simulate a degradation of Young Modulus in a time. I need to use a equation to simulate the Young Modulus, for example E = E0 - D*substep/(total of substeps), where E0 = Young Modulus without degradation and D = percentual of degradation.

I'm using a concrete structure in the program ANSYS.

Can someone help me? My English is terrible, sorry!

3. It is not a good idea to specifying a time-varying Young's modulus.
I instead recommend using one of the CREEP models in ANSYS.

-Jorgen

4. Junior Member
Join Date
2013-02
Posts
2
Hi,
Thanks for the reply Jorgen. Actually I should have given a bit more details about it.
I am using the Usercreep files in User programmable features to establish the concrete creep
equations. But the concrete creep is given as a fraction of the elastic strains. Hence using the
elastic stains calculated by the main ANSYS programme. So need to put the time varying E when calculating the
elastic stains as well.
Do you have any suggestions for this?
Thanks again.

5. I am not sure how you would create a time varying E in ANSYS (and also, I an still not sure why you trying to do that).

-Jorgen