Learning Forum

[Jana Rittelmann]

Hi! 

I am trying to understand nonlinear material behavior, especially superelasticity. 

Looking at Ansys help for superelasticity, there is this idealized stress-strain-graph including the phase transformations (austenite-martensite), where σsAS marks the start of the austenite-to-martensite transformation. (Found here: 4.15. Shape Memory Alloy (SMA) (ansys.com))

Now to my question: Is it correct to assume that a superelastic material will behave like a linear elastic material in the elastic region (i. e. the linear part of the graph in the beginning of the load cycle up to σsAS)? 

In other words: Can I expect linearly elastic behavior if my stresses do not exceed σsAS? 

I'd appreciate any help :) 

[Ashish Khemka]

Hi,

Yes I would expect a linear elastic behavior.

Regards,

Ashish Khemka

[Ashish Khemka]

Hi,

Yes I would expect a linear elastic behavior. In addition, please see if the following links help:

Advanced Shape Memory Alloy Material Models for ANSYS (ozeninc.com)

PowerPoint Presentation (ansys.com)

Regards,

Ashish Khemka