Share UMAT for shape memory alloys?

[JimStian]

Hi! I am working with shape memory alloys (nitinol). I am investigating fracture behaviour of NiTi, using, among other things, simulations in ABAQUS. ABAQUS doesn't have a material model that include plasticity unless you pay for it. I am wondering if anyone have implemented either of the following models as a UMAT, and if you are willing to share the code with me.

- Yan et al. (2003): based on Auricchio's model with a slight change in the martensite evolution and including plasticity (basic J2-flow theory)
- Wang X.M. (2008): a micromechanical approach to phase transformation, accounting for plasticity effects through crystal plasticity (this I am particularly interested in).
- Lagoudas et al. (2004): this approach is directed towards transformation induced plasticity

I would be very thankful to anyone who can help me out. If someone has implemented other material models which include shape memory behaviour and plasticity I would be very interested in this too.

[pine]

If my memory serves me right, abaqus already has a built-in material model for Nitinol, not sure if it includes plasticity behavior or not (and should one load shape memory into plasticity region?).  you can search abaqus answer for superelastic. I don't there there is a source code, just compiled UMAT file that you can download and use. It might not be straight forward to add plasticity to such model due to the need to tract transformation strain. so if anyone spent the effort writing it, it might still be proprietary.

Hansong


--- In Abaqus@..., JimStian <jimstian@...> wrote:

>
>
> Hi! I am working with shape memory alloys (nitinol). I am investigating
> fracture behaviour of NiTi, using, among other things, simulations in
> ABAQUS. ABAQUS doesn't have a material model that include plasticity unless
> you pay for it. I am wondering if anyone have implemented either of the
> following models as a UMAT, and if you are willing to share the code with
> me.
>
> - Yan et al. (2003): based on Auricchio's model with a slight change in the
> martensite evolution and including plasticity (basic J2-flow theory)
> - Wang X.M. (2008): a micromechanical approach to phase transformation,
> accounting for plasticity effects through crystal plasticity (this I am
> particularly interested in).
> - Lagoudas et al. (2004): this approach is directed towards transformation
> induced plasticity
>
> I would be very thankful to anyone who can help me out. If someone has
> implemented other material models which include shape memory behaviour and
> plasticity I would be very interested in this too.
>
> --
> View this message in context: http://www.nabble.com/Share-UMAT-for-shape-memory-alloys--tp26107799p26107799.html
> Sent from the Abaqus Users mailing list archive at Nabble.com.
>