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Buckling

From DT Online

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Description

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(!)

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See - 'The New Science of Strong Materials: Or Why You Don't Fall Through the Floor' by J.E.Gordon


Features and Applications

The point at which a strut might buckle can be assessed using a simplified form of Euler's Buckling Equation as follows:


Where:

  • 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)


DT Online Buyers' Guide
  • Simple Frames and Linkages can be explored using Construction Kits such as those listed below.


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