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Parabolic spring loading

Parabolic spring loading

Parabolic spring loading

(OP)
I need to find the test load for a parabolic spring that is part of a truck suspension.  It is loaded at approximateley 60/40 with 60% load on the parabolic end.  The axle load is 31,000 lbs.  What load should I use to fatigue test it?

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