SM-1415 Unsymmetrical Cantilever Apparatus

Experiments

  • Straight bending of a beam of I cross-section.
  • Unsymmetrical bending of a beam of L cross-section.
  • Torsion moment and shear centre on a beam of U cross-section.
  • Torsion moment and shear centre on a beam of rectanguler cross-section.

Specifications

  • Table-top experiment for general and unsymmetrical bending of straight beams.
  • Four beams of I, L, U and rectanguler cross-section.
  • Eccentricity of load application point adjustable

Description

A member may be subjected to a bending moment, which acts on a plane inclined to the principal axis. This type of bending does not occur in a plane of symmetry of the cross section, it is called unsymmetrical bending. Since the problem related to flexure in general differs from symmetrical bending, it may be termed as skew bending. The unit Unsymmetrical Cantilever Apparatus consists of a horizontal cantilever Rigidly clamped at its lower end to the main column which is attached to a rigid structure. Beams of different sections may be used. A loading head, located at the upper end of the column, can rotate freely around the vertical axis of the beam at different angle intervals. A vertical load may be applied to the free end of the beam by means of a lever attached to the beam mounted on the rotating head. The deflections of the beam are measured by means of two dial gauges mounted perpendicularly to each other on the head. Four steel beams are supplied, one with rectangular section and the other one with L shape section, third with U shape and forth with I section.

On this table unit, the arrangement of the beam specimens on their side enables the experimental set-up to be clearly seen. By observing the beam from the front, the bending of the beam can be easily observed. The interchangeable beams of rectanguler shaped, U shaped, L shaped and I shaped section are clamped at one end in a solid support and the angular position indicated on a graduated disc.

A point load is applied to the free end using a set of weights. The locating bolts facilitate a 25mm offset on either side  of the application of force for generating a combined torsion/bending load. This is necessary for investigating the shear centre. Dial gauges measure the deflection of the end of the beam. Precise zeroing is possible using adjustment bolts.