General Mechanical

General Mechanical

Weird strain at the corners of the beam

    • BrunoSilva
      Subscriber

      Hello everyone, I'm modelling a beam of steel under pure bending. I considered the NL Structural Steel that Workbench offers me, but I changed the Tangent Modulus to 100 MPa (in order to have a material without hardening by plastic deformation).

    • BrunoSilva
      Subscriber
      Upn
    • peteroznewman
      Subscriber
      nI recommend you replace the moment applied to the edge with a Remote Displacement. Apply a Rotation about Z. Set the Behavior of the Remote Displacement to Rigid.nThis will provide an end condition where the edge moves as a rigid body. This will get rid of the extreme deformation of the corner elements. You can insert a Probe into the Results to report on the Moment required to deliver the applied Rotation in the Remote Displacement.nChange the Remote Displacement at the centerline edge to have a behavior of Rigid. That will get rid of the extreme deformation of the corner elements.nThe Rigid behavior will create a different artifact in the beam bending. The normal stress in the X axis will create a stress in the Y axis because the Rigid constraint prevents the Poisson's Ratio strains that would normally occur.nIf you want perfect Beam bending results without the artifacts that a Behavior of Deformable or Rigid creates on shell elements, use Beam Elements.nn
    • BrunoSilva
      Subscriber
      nThank you! That did the work!nI applied a 10 ° rotation on the edge and I get 6265 Nmm on the Moment Probe, almost the same value of M** I computed.If I want to try this on a pure torsion model instead of a pure bending one, I would need to also apply a rigid rotation through a remote displacement in a whole face?n
    • peteroznewman
      Subscriber
      Yes, for pure torsion, apply a remote displacement to the end face and enforce an axial rotation.n
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