how to model 3 point bending test on Ansys
how to model 3 point bending test on Ansys
(OP)
hello and good day,
I would like to know how to positioned the constrain correctly on 3-point bending test on Ansys APDL. in order to mimic exactly the 3 point bending the i have to constrain the bottom end of my model. but Ansys keeps selecting automatically the middle line instead.
And what is the exactly constrains that I should apply. I have tried to constrain all DOF for both ends and partially constrain in Ux& Uy at first end and Uy for second end. unfortunately, both gives me absurd result in terms of displacement vector sum.
my model is in 3D.
can someone suggest more correct technique to done it?
Thank you.
I would like to know how to positioned the constrain correctly on 3-point bending test on Ansys APDL. in order to mimic exactly the 3 point bending the i have to constrain the bottom end of my model. but Ansys keeps selecting automatically the middle line instead.
And what is the exactly constrains that I should apply. I have tried to constrain all DOF for both ends and partially constrain in Ux& Uy at first end and Uy for second end. unfortunately, both gives me absurd result in terms of displacement vector sum.
my model is in 3D.
can someone suggest more correct technique to done it?
Thank you.





RE: how to model 3 point bending test on Ansys
At a minimum release the bending freedom that its reacting to your load; this'll reduce your constraints to 10 (still overconstrained).
The best solution would have only 6 constraints (to take out rigid body motion). Maybe pin one end, and at the other end 2 translations and axial rotation (torque along the beam).
Then check the reactions to ensure they are what you expect.
another day in paradise, or is paradise one day closer ?
RE: how to model 3 point bending test on Ansys
But if you have multiple nodes at each end, then either
1) use an RBE "spider" element to join all the nodes to a single node (at the centroid would be best) then follow the previous post, or
2) let each node react the applied shear, and constrain a limited set of nodes in the other freedoms, you need 4 more constraints. If the centroids of the two ends are not aligned then you'll have kick reactions .
another day in paradise, or is paradise one day closer ?
RE: how to model 3 point bending test on Ansys
disclaimer: all calculations and comments must be checked by senior engineers before they are taken to be acceptable.