Torsion of Circular Sections (Next Generation Structures)

One of a range of experiment modules that fit to the Structures platform Structures platform STS1 (available separately), 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 fit 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 defl ection. 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 eff ective length of the rods to see how this aff ects 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.

*There are 21 different experiments in the Next Generation Structures range.

Key Features

• One of a range of experiment modules that teach structures principles
• Fits to the Structures platform for ergonomic use and space-saving storage
• Fully adjustable chuck positions for increased experiment range
• Includes rods of diff erent material for comparison of shear modulus (modulus of rigidity)
• Includes a tubular (hollow) rod to show the eff ect of ‘missing’ material, compared to a similar solid rod
• Includes Vernier caliper for rod diameter measurement
• Supplied with a storage tray to keep smaller items safe
• Works with user-friendly software (VDAS^®)

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

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