General Mechanical

General Mechanical

3 point bending test on a beam

    • nmarkiz
      Subscriber

      Hello,

      I am trying to simulate a 3 point bending test on a Beam with the following dimensions: L= 125 mm, W= 12.7 mm and T=3.2 mm.

      the span length is 51.2 mm ( the distance between the 2 supports).

      I took the advantage of symmetry and draw my geometry in space claim as following:

      Here the length of the beam is 62.5mm.

    • peteroznewman
      Subscriber
      nI see the orthotropic material has lower stiffness in the Z direction, which I assume is the build direction. What direction was your beam built in? I expect it is the Y direction. That means the material orientation doesn't match the part orientation. A simple fix would be to swap the Y and Z values in Engineering Data.nTwo elements through the thickness is not sufficient for a good resolution of stress values. Change the mesh method to sweep so that you can use large element edge lengths along the length and width, but set the number of sweep elements to 8.nTry replacing the Remote Displacements with Displacement BCs on the two edges.nWhat results are desired and why don't the results you obtained satisfy the desired results?n
    • nmarkiz
      Subscriber
      Hi Peter, nThank you for your response.nWell I didn't print my beam yet, however I have the previous orthotropic material properties. My friend did the simulation using ansys APDL where he used 3 solid rods, 2 as supports and one as pusher and the support is far 20mm from the origin. he got the following resultsnDeformation in Y nnStress in XnnnVon misses StressnnnI draw the geometry again and split the face 20 mm from origin and made a sweep mesh as u suggested. I applied Displacement as Boundary conditions. I want to match my results on workbench with Mechanical APDL. But unfortunately, I couldn't got the same results.nHere is the sweep method, however the generate the mesh with default element sizennnHere are the 2 Boundary conditions:nnnnnHere are the results I obtained which are different and there is a warning ( the deformation is large compared....)nnnnnThank you in advance.nn
    • Mshrest2
      Subscriber
      Hi,nIn the model with solid rods used for bearing and pusher, how was the contact defined between the rod and the beam? n
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