General Mechanical

General Mechanical

Strain-Stress curve

    • balsaidi
      Subscriber

      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
      Subscriber

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

    • balsaidi
      Subscriber

      Hello Mekafime,


       


      Yes I did turned large deformation on.


       


      Regards,


      Bashir

    • peteroznewman
      Subscriber

      Hello Bashir,


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



      Regards,


      Peter

    • Sandeep Medikonda
      Ansys Employee

      Hi Bashir,


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



      Regards,


      Sandeep

    • balsaidi
      Subscriber

      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
      Ansys Employee

      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


      Best Practices to post on the Student Community

    • balsaidi
      Subscriber

      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
      Ansys Employee

      Bashir,


        Please see this post by Peter.


      EDITED: Link Changed


      Regards,


      Sandeep

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