Need some help in *ELEMENT_BEAM_ELBOW
I have modeled pipes and elbow (picture below) using *ELEMENT_BEAM_ELBOW using LSDyna. My model converged but somehow the results are not making sense. The von misses stresses are way larger than what is expected. When I check the d3plot, I found that the elbow elements are separating badly (picture below). It happens for the second elbow as well. My *ELEMENT_BEAM_ELBOW definition is as below:
1 1 1 4 3 (element ID PID N1 N2 N5 and the row below is midpoint N3)
2 1 4 8 3
1 0 0.0 9 2
0.161925 0.159125 0.0 0.0 0.0 0.0 0.0 0.0
1 14 1.0 -1 2 0.0 0.0 0
0.0 0.0 0.0
Could anyone help me in this regard by giving me some suggestions what I am doing wrong? I did not get much help from manual and online. Thanks again.
Your elements are not actually separating, it's just a visualization of the beam cross section thickness. Prepost just displays offsets for each beam which end up looking disconnected (but they aren't).
It looks like you are attempting to define a tube (similar to a in the figure from the manual) but you are defining k=2 which would correspond to c in the figure. Maybe that's your problem? I'm unfamiliar with this definition specifically but doing a quick check, it looks like you have everything else defined correctly.