- #1
skaboy607
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I have been carrying out a lab experiment on the buckling of axially loaded struts and for given set of data and various rod lengths, have to calculate the failure stress, Euler Stress, Rankine Failure Stress, Perry Robertson equation stress. I then plot these against the slenderness ratio. I have done this however the last section says:
'The AISC rules state for L/K values less that (L/K)c, where (L/K)c = sqrt (2pi^2E/sigma Y), plot the parabolic curve: sigma=sigmaY(1-((L/K)^2/2(L/K)c^2). Smoothly join this parabola into the euler curve for L/K values greater than (L/K)c.
I have taken E as 210Mpa, sigmaY as 600Mpa.
The question doesn't even make sense to me and then when I try and work out (L/K)c, I get an asnwer of 2.6 which is less than the lowest slenderness ration I have of wo which is for 20mm rod.
Any help is much appreciated.
Will
'The AISC rules state for L/K values less that (L/K)c, where (L/K)c = sqrt (2pi^2E/sigma Y), plot the parabolic curve: sigma=sigmaY(1-((L/K)^2/2(L/K)c^2). Smoothly join this parabola into the euler curve for L/K values greater than (L/K)c.
I have taken E as 210Mpa, sigmaY as 600Mpa.
The question doesn't even make sense to me and then when I try and work out (L/K)c, I get an asnwer of 2.6 which is less than the lowest slenderness ration I have of wo which is for 20mm rod.
Any help is much appreciated.
Will