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Fastener Fatigue Analysis

Fastener Fatigue Analysis

Fastener Fatigue Analysis

(OP)
Does any one have a detailed fastener analysis or report I could use for a guide?

RE: Fastener Fatigue Analysis

Try the ASM Metals Handbook volume 11 "Failure Analysis and Prevention".  

Good Luck

RE: Fastener Fatigue Analysis

Machinery's handbook has a section on bolt torque, tension, and fatigue - - however, my copy (25th Edidtion) appears to have some small error(s) of some sort.
If you use the numbers you get from the Torquing guide there, but make the units ft-lbs, rather than the inch-lbs it says, you will be pretty close to standard guides.

Otherwise, here's a quick guide:
n is expected number of cycles
if n>1,000,000   use n=1,000,000

For Grade 5 Bolts:    D = 1/4'' - 1-1/4''
     T = [ 1 - (log(n))/30)*10^(3.95  + 3.145log(D) )

For Grade 5 Bolts:    D = 1-3/8'' - 2-1/2''
     T = [ 1 - (log(n))/30)*10^(3.96  + 3.07log(D) )


For Grade 8 Bolts:    D = 1/4'' - 1-1/4''
     T = [ 1.25 - (log(n))/24)*10^(3.95  + 3.145log(D) )

For Grade 8 Bolts:    D = 1-3/8'' - 2-1/2''
     T = [ 1.25 - (log(n))/24)*10^(3.96  + 3.07log(D) )

Hope this helps
Curmudgeon


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