Material law similar to Law2 but with ability to reduce stress?

Altair Forum User

I am trying to get a material model law for simulating a concrete block.

The concrete stress strain curves are shown in the attached image, of which my need is for the 55MPa curve.

 

Now, I am not choosing LAW36 because it deletes the element or brings the stress to zero after the element strain goes beyond the last point.

So I am choosing LAW2 which allows me to keep straining the element and fixing the stress to the max value.

 

But I want a law that allows me to let the stress reduce below the max value and keep constant thereafter so that the element keeps absorbing energy by continuing to strain.

Please suggest a better law or how to modify law2 to achieve this?

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Altair Forum User

Hi Bongirs,

Can you try with material law 24 (/MAT/LAW24 (CONC)), which is designed to model brittle elastic-plastic behavior of reinforced concrete. This law is compatible only with solid elements. And also please review the example in our Help menu, Example 47 - Concrete Validation where concrete failure modeling under compression and tension is shown.