Description
One of a range of experiment modules that fi t to the Structures platform, this product helps students to understand the torsional elastic properties of circular sections (tubes and solid rods). Students choose from a selection of test rods and fi t them between two collet ‘chucks’. They may adjust the distance between the chucks for tests on varying rod length. Each chuck includes pointers that work with the scale on the platform for accurate positioning. Students apply angular deflection to the specimen using a chuck which includes a precision potentiometer to measure the angular deflection. The other chuck connects to a load cell to measure the resulting torque. Students use textbook beam equations to predict the deflection and torque relationship and compare the calculated results with the measured results. This helps confirm the reliability of the textbook equations and the accuracy of the experiment results. This product includes a set of rods of different metals and a tube for comparison of the elastic properties, dimensions and polar second moment of area (‘J’ value). It also allows the student to vary the effective length of the rods to see how this affects the magnitude of deflection for a given torque. The potentiometer and load cell connect to the USB interface hub of the Structures platform for computer display and data acquisition (VDAS® Onboard).
Learning outcomes
- Torsion formula
- Rod length and angle of twist relationship
- Rod material and angular deflection—the elastic (shear) modulus (G)
- Rod cross-sectional dimensions and torsion—the polar second moment of area (J)
- Comparison of angular deflection in similar hollow and solid rods
- Mass per unit length and torsional resistance efficiency of tubes compared to solid rods
Specifications
ATICO is committed to a programme of continuous improvement; hence we reserve the right to alter the design and product specification without prior notice.
Dimensions and weight:
Nett (assembled): 850 mm long x 130 mm front to back and 500 mm high and 14 kg
Approximate primary packed (with storage tray): 0.08 m3 and 16 kg
Space Needed:
1500 mm x 600 mm, level bench or desk Items Included:
Two chuck assemblies: one with a precision potentiometer for angular measurement, the other with a load cell for torque measurement
Angular measurement from 0 to 25 degrees
Torque measurement up to 1 Nm
Three diff erent rods of length 700 mm and nominal 3 mm external diameter:
1 x brass (solid)
1 x brass (hollow)
1 x stainless steel (solid)
Two cables
Hexagon tools for fi xings
Vernier caliper
Storage tray
Comprehensive user guide
Operating Conditions
Operating environment:
Laboratory
Storage temperature range:
–25°C to +55°C (when packed for transport)
Operating temperature range:
+5°C to +40°C
Operating relative humidity range:
80% at temperatures < 31°C decreasing linearly to 50% at 40°C
