After a short search, i found a useful pdf file about factor of safety . I want to share it and i hope that another link or suggestion give me .
I am welcome with any suggestion.
Thanks for sharing it!
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Hadn't read your comment yet, just logged on this a.m.
However, FoS, as with almost everything, depends on what you are doing and who you are designing for. There are company standards, industry standards, and regulatory standards. For example, OSHA (U.S.) uses the ASME value for 'under-the-hook' lifting equipment. Some industries use 5:1 based on UTS and others accept 3:1 based on YS.
If you are designing much closer to the bleeding-edge then you may have to calculate your own FoS based on all the myriad conditions you feel important.
FOS depends on what type of work your doing like for examples engine crank shaft are about 45:1 or above
Here is a good engineering sources
Factors of Safety
Factor of Safety FOS Review - Engineers Edge
45:1?? WOW, doesn't sound very cost effective.
yeah it sound not a cost effective even me when i first hear that before from my old instructor
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