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Calculate the Euler's limiting value of slenderness ratio for which it is not valid for long columns.Take E=2×105MPa,σc=320N/mm2
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 Data: E=2×105MPa,σc=320N/mm2  Find: λlimiting   For long column, Euler's formula,  PE=π2 EImin (Lc)2

 But K=IA K2=IA I=AK2 PE=π2E×A×K2(Le)2 PEA=π2E(LeK)2
σc=π2E(λ)2 (λ)2=π2Eσc λ=π2Eσc
λ=π2×2×105320  for column to be safe  π2×2×105320λ 78.54λ

This Euler's limiting value is 78.54. If it is less than 78.54 Euler's formula for long column is not valid.

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