First of all, not sure if this is the right place for my question, but here goes. I started a topic in the mesh-thread about a frame on which I want to do a stress analysis. The mesh is adequately good enough for now, so I started to try and get some results. First I did an analysis on the frame as is. Results are shown in img1. Secondly I added two supports in the frame and thirdly I added another two (4 in total). Results are shown in img 2 and 3.
What's bizarre is that while adding extra support on the bottom of the frame, it results in a greater
total deflection. Now this can't be right? All three examples have the same set of pressures working on them, it's basically a load of 100kg on the big and the two little squares (each), 150kg on the two middlesized squares (eacht) and a load of 150kg, divided over the three round holes (37,5kg each).
I did this by selecting all the nodes on the squares and circles with calculate 0°. After which I added the equivalent pressure of the specific loads (eg. 0.0000421 on the biggest square on the left). I redid this with simply adding the force over the same surface with FE checked, but this rendered an equivalent result. The frame is constrained in the z-direction on the bottom fold, as seen in img 4. I tried to constrain in all directions, with no difference in result.
Am I not adding the forces/pressures in the correct way? Because the result should be that the frame becomes noticeably stiffer, in stead of just deflecting more with every support I add...
Click for complete pic.
No support:
2 extra support beams (vertically)
4 extra support beams (vertically and horizontally)
