Fastener Fatigue Analysis
Fastener Fatigue Analysis
(OP)
Does any one have a detailed fastener analysis or report I could use for a guide?
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RE: Fastener Fatigue Analysis
http://www.clarkson.edu/~sweettj/projects/mechanics/mmeproject.htm
http://dijit.virtualave.net/engineer/bracket.htm
RE: Fastener Fatigue Analysis
Good Luck
RE: Fastener Fatigue Analysis
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