Problem with Crasurv

Altair Employee

Mar 2, 2015

Updated Oct 4, 2020 by Altair Forum User

Hi,

I'm trying to understand LAW 25 with CRASURV formulation. So I perform a single element test to see how it works. As far as I can see from the Radioss Reference Guide, it should be possible to use different values of plastic work for each material direction by setting the Flag Iflawp=1. So I do that, but there was no effect. The global criteria (Wpmax) was still the dominating one and the local one (Wpmaxt1,Wpmaxt2,.....) has no effect. That means, the Element is ruptured when the global criterion is reached. If I deactivated the global criterion the local one also has also no effect, which means that the element is not ruptured.

What do I wrong?

best regards

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Altair Forum User

Altair Employee

Mar 9, 2015

Updated Mar 9, 2015 by Altair Forum User

Hi,

My Problem is still exisitng. Have anybody an Idea which seettings are important to use CRASURV?

best regards

Altair Forum User

Altair Employee

Mar 10, 2015

Updated Mar 10, 2015 by Altair Forum User

Hi MrEtker,

do you see a similar behaviour with LAW25 TsaiWu?

according to the reference guide, if Sigma11 is greater than Sigma yield in tension then ruptures takes the local values.

maybe you have to increase the load so that stress from tension and compression in major direction is greater than SigmaYt and SIgmaYc.

Altair Forum User

Altair Employee

Mar 11, 2015

Updated Mar 11, 2015 by Altair Forum User

Hi,

Yes I see the similar behaviour. The stress value is greater than the Yield stress but there is no rupture of the element. After the Yield stress is reached, i modeled plasticity hardening which occurs

until a mximum stress is reached. Afterwards the Element should be ruptured at Wpmaxt1=110, but it didn't do it. I attached the stress/strain curve and the material card to check.

best regards

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