From DT Online
A Structural Member in Compression (i.e. a Strut) is more likely to buckle first when subjected to pressure - assuming the Strut is made of a sensible material and not something so brittle it is likely to explode under pressure(!)
Features and Applications
- Pcrit = the Critical Force at which the strut will start to buckle.
- E = the Young's Modulus of the material (obtainable from tables or by experiment).
- Capital I = the Moment of Inertia about the Neutral Axis (for a rectangular beam this is its breadth times the depth cubed divided by 12).
- L = the length of the Strut (this is taken as the total length if the strut is assumed to be pin-jointed at each end but would vary with other fixing methods - see Euler's Buckling Equation)
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