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RE: FOS for von-Mises stress criteria

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-----Original Message-----
From: Christopher Wright [mailto:chrisw(--nospam--at)] 

1. Shop foreman isn't getting the production rate, asks plant engineer 
how to increase crane capacity.
2. Plant engineer figures there's a 1.6 safety factor on the rails and 
opines that foreman can increase the load by 1.6 for a little while.
3. Little while becomes daily; 1.6 becomes 2; plant engineer retires 
and foreman gets a new job. The loading increase becomes 'perfectly OK, 
we do it all the time with no problems' until the trolley slips off the 
rails because the flanges are bent too far under the overload.

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