Experiments

  • Investigation of the deflection for statically determinate straight beams
    • cantilever beam
    • single-span beam
    • formulation of the differential equation for the elastic line
  • Deflection on a cantilever beam
    • measurement of deflection at the force application point
  • Influence of the material (modulus of elasticity) and the beam cross-section (geometry) on the elastic line.
  • Determination of the shear modulus of various materials.
  • Angle of twist dependent on
    •  Clamping length
    •  Bar diameter
  • Formulation of proportional relationships for the angle of twist.

Specifications

  • Elastic lines of statically determinate under various clamping conditions of single span beam.
  • Beams are availible in different materials and different dimmensions.
  • 2 support with clamp fixing and dill chuck with bearing.
  • 1 dial gauge to record deformations with dial gauge support, dial gauge 0-20mm, least count 0.01mm.
  • 1 set of weight with adjustable rider.
  • Aluminium section frame housing the experiment.
  • Storage system to house the components.

Beam is a structural member used to withstand load primarily by resisting bending. Internally beam experiences compressive, shear and tensile stresses.

Beams are key structural elements in mechanical engineering and in construction. A beam is a bar-shaped component in which the dimensions of the cross-section are much smaller than the length and which is subjected to load along and perpendicular to its longitudinal axis. The load perpendicular to the longitudinal axis causes a deformation of the beam – that is, bending. Based on its size, the beam is viewed as a one-dimensional model.

The equipment is used for measurement of deflections and slopes of a beam under bending and compare with values calculated by differential equation and Area Moment Method.

Torsional vibration is angular vibration of an object commonly a shaft along its axis of rotation. Torsional vibration is often a concern in power transmission systems using rotating shafts or couplings where it can cause failures if not controlled. The unit Combined Bending and Torsion of Bars enables the student to understand the rotary vibration torsion bars. The unit is basically bentch top base frame. Torsion bar is clamped between chucks. The mass hanger and load is a appled to the torsion bar at its one end.

Torsion is a typical loads to which components are subjected. The resultant stresses and deformations can lead to failure of the component. A number of different factors play a role in this, including the material, the cross-section of the bar, the clamping length and the method of bearing support.

This apparatus investigates the influence of these factors on the twist of a bar under bending load or torque. A set of test bars has been assembled for both bending and torsion experiments so as to permit direct comparison of measurement results. The bar under investigation is fixed to two movable support blocks and loaded down by a weight. A dial gauge records the resulting deformation. The support blocks include clamping chucks to hold the torsion bars and bearings for the bars in the bend test. The bearings offer a range of clamping options.

The various elements of the experiment are clearly laid-out and housed securely in a storage system. The complete test setup is arranged on the frame. The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

The bending load can be applied to the beam when torsion of bar a not in used. Deflection are noted upon loading of beam.