{"id":32470,"date":"2019-01-07T08:45:26","date_gmt":"2019-01-07T08:45:26","guid":{"rendered":"\/forum\/forums\/topic\/quarter-symmetry-and-boundary-conditions-for-three-point-bending\/"},"modified":"2019-01-07T08:45:26","modified_gmt":"2019-01-07T08:45:26","slug":"quarter-symmetry-and-boundary-conditions-for-three-point-bending","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/quarter-symmetry-and-boundary-conditions-for-three-point-bending\/","title":{"rendered":"Quarter symmetry and boundary conditions for three point bending"},"content":{"rendered":"

I followed the discussion on Three point bending<\/a> to design my model for static structural non-linear three point bending simulation with symmetry. The block size is 160x40x40 mm with a span length of 120 mm.<\/p>\n

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For symmetry, I reduced the model to 160\/2 mm (in length) and 40\/2 mm (in width). I ran the model but I think I am mistaking somewhere either in symmetry or in boundary conditions. I would like to request guidance on the following queries;<\/p>\n

(1). Originally in the complete 3D design (without symmetry) I split the face to make place for the rollers (both top and bottom each with 10 mm of face split length). If I reduce the model length wise i.e. 160\/2mm, I also reduced the face split of the top roller to 5 mm. Is it correct?<\/p>\n

(2). When I model symmetry, in the present case is the quarter model, I should apply the boundary condition load (displacement controlled) 1\/4th of the original value. Will the resultant values (for force, deformation, stress, strain etc) will only be for the 1\/4th of the model or for complete model?. I need to compare the experimental results with that of the simulation.<\/p>\n

(3). I created the symmetry as following;<\/p>\n

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Is the symmetry designed above is correct? One of the post here<\/a> suggested to make symmetry on both faces and edges. What will be the difference if I only make symmetry on the faces only as I have done above?<\/p>\n

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(4). I applied the boundary conditions as following; with displacement A as x=free, y=-0.5mm, z=free. And displacement B as x=free, y=0mm, z=0mm. Could someone please correct me on applying the proper boundary conditions?<\/p>\n

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With in the discussion the remote (loading) displacement was suggested. I am not clear about on how the rotations and components are decided to be set free or set as constant? Also, since I will be modeling the non-linear behavior so I shall keep the remote displacement behavior as deformable?<\/p>\n

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