Typically we use quasi-static loads on our system level structures. Because the system level models are so large we often recover interface forces from the system model (of different mating components) and then apply these forces at bolted joints of detailed stand alone 'fitting' models. Then we recover stresses in the joints. In this particular instance we have a random vibe load for our system model. We are using cbush elements to recover the forces and as you all know the RMS force values have no phase information and thus are all 'positive' in nature. I realize the correct manner to do the proper stress analysis would be to incorporate the detailed fitting model into the system model and recover RMS stresses. Does anyone have any experience applying random vibe interface forces to stand alone highly detailed fitting models? Applying all 'positive' values isn't really appropriate.
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