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Modelling a beam with initial tension?

Mar 30, 2017 at 1:34 PM
I want to thank you for the superb library. The additions of springs and plates are really great!

I was wondering if there is a way to model a beam with "pretension", that is to say put some initial tension into a beam before solving? What I am specifically modelling is a system where there is a cable under tension and a temporary support brace (used during construction) holding it. I want to model what happens when the brace is removed.

Thanks for any advice you could give, and definitely thanks for contributing this excellent library to the open source community.

Apr 21, 2017 at 1:40 PM
Sorry for delayed answer.
Unfortunately it is not possible to model any stress strain curve but a linear one. It means that Stress should be a multiply of strain:
But I think what you mean should be something like this:
σ=E.ϵ + σ0
Where σ0 is a constant. and it is not linear relation, so not possible to directly model it in current version of this library.
What you need should be material (and geometrical) non-linearity, non of them are implemented in BFE.