This bench top unit allows a variety of experiments to be undertaken to investigate test specimens under torsional loading and bending loading within their elastic limits.
The students cover topics involving bending moment equation, torsional rigidity, modulus of rigidity, angle of twist, and create graphs and compare actual measured values with theoretical values using formulae and theory provided.
An extruded base frame carries two solid vertical supports. Profiled grooves within the base frame, fasteners and quick release handles ensure quick and easy adjustment of the span between the vertical supports.
One vertical support carries a unique specimen chuck with a through hole. Another chuck is held stationary at one end of the base frame. The chucks have two functions; to secure the torsion specimens during testing and to transmit the torsional loading to the torsion specimen. The torsional load is transmitted using a pulley and cord arrangement, with the pulley being mounted to a shaft running in bearings. The bearings minimise the friction in the system. The chuck installed into the vertical support has a through hole to allow the length of the torsion specimen to be varied.
The twist of the torsion specimens is indicated on an angle indicator and pointer, which can be moved along the test specimen.
The remaining vertical support is used for bending tests. Each vertical support has a top clamp provided. This allows the end support arrangement for the bending specimens to be varied, i.e. clamped, simply supported on knife edges or on ground dowels. The supports can be moved along the base frame thus changing the beam span.
To measure the bending specimen deflection a dial gauge is fixed onto a movable stand and can be positioned anywhere within the beam span.
A set of torsion and bending specimens are supplied. A load hanger and set of calibrated weights create specimen loading.
A comprehensive instruction manual is included covering the apparatus, experimental procedure and example results. All necessary tools and accessories are supplied.
A 2 year warranty is supplied with this unit.