Simplified method of solution of the equation,

1

• where p = the permissible stress.

• py = proof stress.

• d = external diameter of strut.

• k = radius of gyration.

• l = length of strut.

• δ = eccentricity.

• E = Young's modulus of elasticity.

This method is mainly developed in order to reduce the time taken to work out a series of curves of permissible stress against (l/k). The graphical methods have so far been elaborate and no definite accuracy can be maintained.