Learning Forum

[balsaidi]

I am trying to simulate a stress-strain curve for simple cantilever beam. Why I am unable to achieve the plastic region? Changed the material type but the curve still linear! 

 

Thanks,

Bashir

[mekafime]

Hi, do you activate "large deflections on" in Analysis Settings?

[balsaidi]

Hello Mekafime,

 

Yes I did turned large deformation on.

 

Regards,

Bashir

[peteroznewman]

Hello Bashir,

Did you add Bilinear Kinematic Hardening from the Plasticity section of Engineering Data to your material?

Regards,

Peter

[Sandeep Medikonda]

Hi Bashir,

  Alternatively, you can also use "Structural Steel NL" from Engineering Data Sources.

Regards,

Sandeep

[balsaidi]

Thanks Peter and Sandeep,

 

I am using Polyethylene plastic in my research. Is there any way that I can achieve the S.S. curve computationally?  I am looking to identify the elastic region of Polyethylene. 

 

Regards,

Bashir

[Sandeep Medikonda]

I don't quite understand why? Elastic properties are easily available online/from engineering data just plot it based on the youngs modulus and yield stress?

If you want to look at it computationally/back calculate, use a single (unit) element model and subject it to uni-axial displacement by constraining the 3 faces on the sides in x, y an z directions as needed to properly constrain all rigid body motions. Get the force-displacement or stress-strain curves from that to verify?

Regards,

Sandeep

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[balsaidi]

Sandeep,

Do you mean deriving S.S. curve from nominal stress? I did it for shear stress test, not sure if I did it right but still unable to define the end of elastic region! 

I would be grateful if you have something to share with me regarding the nominal stress testing method?

Regards,

Bashir

[Sandeep Medikonda]

Bashir,

  Please see this post by Peter.

EDITED: Link Changed

Regards,

Sandeep