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StressMan2506 (Structural) (OP)
16 Dec 08 4:16
Can anyone out there supply me the above info, or points from which the Ramberg-Osgood equation can be formulated?

I cannot find what I need in any of the handbooks to which I have access.

Thanks in anticipation.
Neubaten (Industrial)
16 Dec 08 7:40


From "Aerospace Struc. Met. Handbook", tensile and compression stress-strain curves for A-286 sheet.  
Neubaten (Industrial)
16 Dec 08 7:45


Probably, you'll already have this one, but here it is the properties table from MIL-HDBK-5
rb1957 (Aerospace)
16 Dec 08 7:55
where you looking for the curves, or the points to pick from them ?  Bruhn (fig B1.12) shows the method very clearly ... draw lines at 70% and 85% E.  these intersect the stress/strain curve at f.7 and f.85 respectively.  then you normalise stress with f.7 and get ...

E*strain/f.7 = (stress/f.7) + (3/7)*(stress/f.7)^n

n = 1+ln(17/7)/ln(f.7/f.85)
rb1957 (Aerospace)
16 Dec 08 8:05
Bruhn has some Ramberg data for A286 ...
ftu = 140ksi, fcy = 95ksi, E = 29E6psi, n = 15, f.7 = 93ksi
 
StressMan2506 (Structural) (OP)
16 Dec 08 8:32
Thanks, guys. I have Bruhn and, rb1957, I have found the values you quote.

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