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Homework Help: Buckling and column effective length question

  1. May 15, 2015 #1
    1. The problem statement, all variables and given/known data
    If I have a column, fixed at both ends, i am aiming to work out the minimum length where buckling is likely to occur.
    I know this is a similar question to that asked before, however please bear with me.
    Column outer diameter 100mm, inner diameter 60mm
    Youngs modulus E=250GNm^-2
    Yield stress = 180MNm^-2

    2. Relevant equations
    1. K = 0.5 sqrt (R^2 + r^2)
    2. ESR = sqrt pi^2 E/ yield stress
    3. ESR = Le/k
    3. The attempt at a solution

    To find K using the above equation I have taken the radius 0.5 x sqrt (0.05^2 + 0.03^2) = 0.0292
    Then to find the ESR I have sqrt(pi^2 x 250000000000 / 180000000) = 117.080
    Changing the third equation from above for Le I have ESR x K = Le (117.080 x 0.0292) = 3.419m
    Given that the column is fixed at both ends I have multiplied this by 2 and reach the minimum length of the column at which buckling is likely to occur to be 6.84 m - is that correct please?
  2. jcsd
  3. May 15, 2015 #2


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    Staff Emeritus
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    Homework Helper

    Yes, this looks correct.
  4. May 18, 2015 #3
    Thank you!
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