SM-1412 Column Buckling

Experiments

  • Investigation of buckling behaviour under the influence of
    • various methods of support
    • various bar lengths
    • various materials
  • Verification of the Euler Theory: Buckling on elastic bars.
  • Determination of the modulus of elasticity for an unknown material (GRP).
  • Measurement of force and deflection – Calculation of the expected buckling force by the Euler formula.
  • Graphical evaluation of deflection and force.

With supplementary set Apparatus

  • Investigation of buckling behaviour under the influence of
    • various cross-sectional shapes
    • eccentric application of force
    • additional transverse loading

Specifications

  • Investigation and testing of all relevant buckling cases.
  • Verification of the Euler Theory of buckling.
  • Experiments in horizontal or vertical orientation.
  • Spindle to apply forces.
  • Transverse load application device generates shear forces.
  • Force measurement using a load cell.
  • Measurement of lateral deflection by dial gauge.
  • Storage system to house the components.

Description

The bench top unit is used for studying buckling on struts under various end conditions. A type of failure that is sometimes overlooked for a body subject to compressive load is that due to instability, called buckling. The unit Column Buckling Apparatus consists of two vertical columns where load is applied by a screw via a sliding guide in a ball bushing. Pivot support is a wedge on a Vnotch and built-in support is a cylinder in a socket. Load on the strut is measured by a load cell and deflection is measured by a dial gauge. Side loading is by a weight hanger and weights. Height of loading beam is Adjustable to accommodate different strut lengths.

In technical mechanics, loss of stability is known as buckling. Under the effects of compressive forces, and under increasing load, the axis of the bar deflects laterally until it suddenly and violently fails (collapses), even before the fracture point is reached. The stresses in the bar often remain within the elastic range during this process.

Column Buckling investigates the buckling behaviour of bars under various influences. All relevant buckling problems are demonstrated by way of experimentation. For the purpose, one end of a bar is fixed or pinned, depending on the buckling case.

A height-adjustable load-carrying cross-arm and a hand-operated spindle are used to apply compressive force to the bar. An axial bearing between the spindle and the bar support prevents torsional loading of the test bar.

A hydraulic load cell measures the applied force and indicates it on a pressure gauge. The lateral deflection of the bar is indicated on a dial gauge. Experiments demonstrate various influences, such as bar lengths, materials and methods of support.  A transverse load application device can be used to generate additional shear forces on the test bar.

The experimental unit can be operated vertically or horizontally. The load gauge can be rotated 90° to adjust to the chosen option. A supplementary set extends the scope of experimentation offered by Apparatus.

The various elements of the experiment are clearly laid-out and housed securely in a storage system.