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Drop test including modeled preloaded joint

Question asked by Nick Hahn on Oct 29, 2014
Latest reply on Nov 4, 2014 by Jared Conway

I would like to perform a drop test simulation on an assembly that contains a preloaded joint.  The preloaded joint is not a fastener that I can treat as a beam - it is two large threaded parts (imagine pipes with shoulders that bottom out on each other and are then torqued further) and I am interested in if the joint separates during the drop (I don't care about the thread stress, they can be considered bonded there).  I have successfully modeled the preload portion using the "shrink fit" boundary condition in a static study.


This can't be done in a standard drop test study, can it? Can a static analysis (i.e. with the "shrink fit" BC) be used as an input to a nonlinear dynamic one?


Assuming the above is not possible, is there a sequence of load/displacement/force curves and/or restart cases that might make this work?


I have done many simulations before but I'm new to SW Simulation, so I'm trying to figure if this is possible. We've always had to ignore the preload before but that is quite conservative.


A similar case I'd also like to examine has a press fit item that I would like to include in a dropped assembly.