Study Set Up
Study Set Up
(OP)
Morning all,
While I've done some Simulation studies in the past, they've always been straight forward studies. This time I need some help with the set up.
I have an 8" diameter rod threaded into a 1/2 tube with a 3" wall thickness. They are Acme threads at 1/2" pitch. There once threaded together, the rod will be welded to the tube as well. The question is whether the threads, and weld, will withstand 24,000 lbf. (FOS of 4). I did create the threads on the two pieces as I'm guessing that I'll need to create contacts between them, but I'm hoping that someone can tell me the best way to go about this.
Thanks!
While I've done some Simulation studies in the past, they've always been straight forward studies. This time I need some help with the set up.
I have an 8" diameter rod threaded into a 1/2 tube with a 3" wall thickness. They are Acme threads at 1/2" pitch. There once threaded together, the rod will be welded to the tube as well. The question is whether the threads, and weld, will withstand 24,000 lbf. (FOS of 4). I did create the threads on the two pieces as I'm guessing that I'll need to create contacts between them, but I'm hoping that someone can tell me the best way to go about this.
Thanks!
Jeff Mirisola, CSWP
Design Manager/Senior Designer
M9 Defense
My Blog






RE: Study Set Up
Jeff Mirisola, CSWP
Design Manager/Senior Designer
M9 Defense
My Blog
RE: Study Set Up
Have you considered running it without contact first? The reason to do this is simple, the weld is far stiffer than the threads and there is no clearance in the weld so it takes load from first application of the load. So it is likely that the weld will be the primary load path into the tube.
As to running contact on the threads you will likely have to make several runs to capture various tolerance extremes. Do you plan to have preload on the threads?
TOP
CSWP, BSSE
www.engtran.com www.niswug.org
"Node news is good news."
RE: Study Set Up
The preload, if any, will be minimal. It'll depend on how, ultimately, the rod gets indexed as the it's the last piece of a hinge assembly. However, the assembly isn't designed as we haven't determined that this threaded rod idea is going to work.
Does any of that make sense?
Jeff Mirisola, CSWP
Design Manager/Senior Designer
M9 Defense
My Blog
RE: Study Set Up
Draw a free-body diagram of the various scenarios.
I am not sure why you would go to all the trouble of making an acme thread on something that is welded together. Threads are for things that might need to be disassembled. A taper or press fit with a weld makes a lot more sense.
TOP
CSWP, BSSE
www.engtran.com www.niswug.org
"Node news is good news."
RE: Study Set Up
Jeff Mirisola, CSWP
Design Manager/Senior Designer
M9 Defense
My Blog
RE: Study Set Up
TOP
CSWP, BSSE
www.engtran.com www.niswug.org
"Node news is good news."
RE: Study Set Up
Jeff Mirisola, CSWP
Design Manager/Senior Designer
M9 Defense
My Blog