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clc
D=50 // in mm
A= %pi/4 *(D/1000)^2
// solving for test 1
N=150
Sp=157.5
Sr=44.2
Tf=Sp/A
Tr=Sr/A
// from graph
k=tand(27)
k1=tand(14.6)
printf('Peak strength Tf = 40+ t*%f\n',k )
printf(' Residual strength Tr = t*%f',k1)
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