Residual Stress Estimates from a Ring Sample
Residual Stress Estimates from a Ring Sample
(OP)
I have a sample from a alloy steel pipe, 5" diameter, 3/16" wall thickness and 3" long. While cutting a longitudinal slice from the ring sample, it sprang open 3/4" (scaring the [expletive-deleted] out of my metals tech. I know there is a way to calculate the residual hoop stresses in this pipe section from the data provided, but I cannot find it in what few references I have on this subject. Any thoughts?
SMF, out
SMF, out





RE: Residual Stress Estimates from a Ring Sample
RE: Residual Stress Estimates from a Ring Sample
RE: Residual Stress Estimates from a Ring Sample
Max. residual circ. stress:
s = ± E*t/(1-u^2) * (Df-Di)/(Df*Di)
where
E = modulus of elasticity
u = Poisson's ratio
t = average wall thickness
Di = average initial (pre-split) diameter
Df = average final (post-split) diameter
The standard describes the process for taking measurements at various points to determine the average values.