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Nitinol Beam

Nitinol Beam

(OP)
Hi everybody,
I have modeled a cantilever beam with material properties of Nitinol, in Abaqus CAE.(VUMAT)
There is a displacement control and pushes the end of the beam downward.
In the first step the BC is exerted and then in the second one, it is released.
The simulation works well by any material. But it exhibits a strange response when nitinol is used.(It seems that the elements are decomposed)
Any idea is appreciated.

RE: Nitinol Beam

@IRStuff

Slightly off topic: This isn't entirely true; Nitinol is occasionally used in the super-elastic state for implants that require a larger range of strain than can be provided by titanium (or SS or CoCr...) alloys.

RE: Nitinol Beam

(OP)
Yes, you are all right.
But this is a simplified version of my question.
My actual problem is a stent. When the stent is crimped (compacted) the behavior of Nitinol is fine. But when it is released, it's elements detach and the stent explodes.
So to check Nitinol response, I decided to model a simple cantilever beam in Nitinol.
I had the same problem. Any other material works fine.
Any idea?

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