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Hi, I have an assignment where I have to calculate the optimum spacing of spot welds of a simply supported built up beam that is made with a C channel and two plates welded one on top and one under that has a uniformly distributed load on top of it. Each spot weld can take 8kN of force, and to...

Ok, I went over my math and I had made a mistake. That is why my shear center was off and was still getting some torsion. Now applying a point load at midlength of the beam and and my supports also with RBE2 elements on a point in line with the shear center I am getting correct stresses. I...

As an update. To make it as simple as possible I have modeled only a C section channel with the hight of the C channel and the width of the plates. This way it is easier to do some handcalc and compare. I have also placed a point load and mid length and on the share center (or at least tried...

Hi. This is my last final exam to get my engineering degree. I have had some difference of oppinion on how to approach the proble with my professor. But at the end of the day, it will be him evaluating and the one that decides if I graduate or not. I can anyway try a model with the FEM moved so...

I will try, but my professor did not really like when I juggested moving the plates. And this is why I went the route of RBE2 elements. What would you use to represent the simply support? would you use the RBE2 to a point in CG or would you do something else?

The loads are applied distributed on the surface of the top plate. The reason for using the RBE2 is that there are no common nodes. I started from a 3D model and got the midsurface and I am meshing thet. So the distance between the C channel and the plates y 3mm. I guess I could replace them...

Hello, I am trying to model a simply supported beam with a distributed load. The beam is formed with a C section channel and two plates that are welded, one on top and one on the bottom. To model this I am using NX and using CQUAD4 elements and have done a 1D connection Edge to Edge with RBE2...

I have modeled the S channel and plates separately. What I want to get from the model is the load that each weld point is taking and the stress around the weld point. What I do not understand of your comment is how can I represent a 9mm diameter weld point out of a uniform mesh. Maybe I am...

Sorry, I do not fully understand what you mean. Could you please elaborate a bit more?

Hi, I am trying to mesh some spot welds in NX on a beam that is made of a C section beam with a steel plate welded on the top and bottom. This is how I am meshing at the moment, I am meshing it all with CQUAD4 elements and they are 5mm in size (not inside the spot weld). When I run the...