# Torsion lab report

Part C: Torque application and recording of results To obtain sufficient data within the elastic range, different degree of torque was applied onto the two specimens increasingly based on the values stated in Table 1.

## Torsion theory

Lastly, the Torsiometer, supposed to measure only the small angles of twist in the elastic range of the specimen, was installed onto the specimen. In a circular rigid structure, when torque is engaged, there will be a resisting force. In practice, torsion is often accompanied by bending or axial thrust due to any line shafting driving gears or pulleys, or propeller shaft. Alternatively, by substituting in Equation 1 into Equation 5 and rearranging the terms, Equation 7 will be formed. To achieve the specified objectives, the applied torque is measured with respect to its angle of twist and using torsion formula, the shear modulus, modulus of rupture and limit of proportionality will be determined. Load by definition is any external force that is acting on the structure and stress is then the internal force which counters the external force s. Angle of twist graph for Mild Steel Elastic range

First and third equation can be combined to an equation through which we can find the modulus of rigidity of any material under observation. Within the proportional limit, the stress is directly proportional to strain i. In practice, torsion is often accompanied by bending or axial thrust due to any line shafting driving gears or pulleys, or propeller shaft.

This hence indicates that the member is being compressed; torsion puts member into compression state. When a member is undergoing torsion, all planes that are either parallel or perpendicular to the axis will be having a maximum shear stress.

As said earlier that stresses produce by the torque will be zero at central axis and maximum at the outer surface. This means that the stresses are being spread throughout the twisted member and hence, exhibiting ductility.

You are on page 1of 28 Search inside document Module: CV Laboratory 2A-9 ST Torsion Abstract In mechanics, torsion is defined as the twisting of an object due to the applied torque or moment which will produce rotation along the longitudinal axis of an object.

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