{"id":242710,"date":"2022-12-01T21:11:50","date_gmt":"2022-12-01T21:11:50","guid":{"rendered":"\/forum\/forums\/topic\/problem-in-getting-nodal-forces-by-fsum-command-in-roller-bearing\/"},"modified":"2023-01-19T17:54:47","modified_gmt":"2023-01-19T17:54:47","slug":"problem-in-getting-nodal-forces-by-fsum-command-in-roller-bearing","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/problem-in-getting-nodal-forces-by-fsum-command-in-roller-bearing\/","title":{"rendered":"Problem in getting nodal forces by FSUM command in roller bearing"},"content":{"rendered":"

Hi everyone!<\/p>\n

I am modeling a 2D plane strain model of a cylindrical roller bearing in ANSYS APDL. I have a bearing housing which inside it there is an outer ring with 5 rollers in its bottom half. Also, there is a thin layer of soft material between the outer ring and the housing. I want to apply 180 N force on the middle roller, 100 N on the left and right rollers closer to the middle, and 20 N on each roller on the far end (right and left). The length of the roller and bearing in the normal direction is 11 mm which I used “le” in my commands. So, the force on each bearing named by Q1 to Q3 must be divided by 11. Also, to apply these forces as pressure (SFL) on the surface of the rollers, I must divide these forces by the diameter of the roller which is 10 mm. Then, I apply these pressure on the roller and solve the model. The contact between the lower half of the bearing and housing is bonded, and the bottom half is frictionless. The soft material is already glued on the outer ring with AGLUE command. The contact of the rollers and the outer ring is rough and on the two corners of each roller I have constrained the rotational motion of the rollers to prevent rigid body motion (radial direction is free). <\/p>\n

 <\/p>\n

Now what I expect from solving this model is that if I type “FSUM” for the whole model, I should get a value equal to the total force I applied to my model. I applied 180 + 2*100 + 2*20 = 420 and divided by the length of the model (11 mm) will be 38.1 N\/mm but I get 33.17 (if you write allsel and then type FSUM in the post-processing).<\/p>\n

My main objective now is to see how much of these forces is being applied to the soft material between the outer ring and the housing. That is why at the end of my code I wrote asel,s,,,5,8 and I typed FSUM for these small areas. But it gives zero force to me. If I select the housing only and do FSUM, again it gives me zero. The only way I can see the force is when everything is selected. <\/p>\n

 <\/p>\n

I don’t think this is true and there must be a reaction force between the outer ring\/soft material and the housing surface. Does anyone have any idea? <\/p>\n

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