Learning Forum

[rhs]

I have been trying to run a rough 3-point bending test on a mm-scale circular beam. I have been unable to create a point load at the exact center of the beam (possibly since I'm using SolidWorks to create the object files), but I've gotten it close enough that it appears to be centered. I am using the two ends of the circular beam as fixed ends for the bending test (both this and the force are shown in one of the included pictures). However, my hand calculations do not match the results ANSYS is giving me for the forces I'm applying. I have ensured that the same materials and objects are used in both sets of calculations.

In the attached picture of an Excel file, the fixed-end assumption produces a different stress and about half the displacement that ANSYS does. The simply-supported-end assumption produces a stress that is close to what ANSYS is giving me, but the deflection is about three times higher than what ANSYS gives me. Both my hand calculations in Excel and the ANSYS results are included in the pictures.

[1shan]

,nSince the problem is pretty simple, you should be getting a close correlation between analytical and simulation. When you inset a point load there is a chance of singularity, so a convergence study is necessary. Please check this video

. You may follow the same methodology and modify the supports according to your requirements.nRegards,nIshan.n n

[rhs]

,nnI performed the convergence study before sending this in; I probably should have mentioned that. The only change in both sets of results is the magnitude, as shown in the newly attached photo. I have confirmed through another post that I cannot go lower than 1.5 um because of license restrictions on the number of nodes. n Sincerely,nRob Smithn