TABULA OLUM Material of the specimen Mild Steel Diameter of the specimen (d) 6 m
ID: 1842057 • Letter: T
Question
TABULA OLUM Material of the specimen Mild Steel Diameter of the specimen (d) 6 mm Length of the specimen ILm 75 mm Input Angle Specimen (Hand wheel torsion Angle Moment (N.m) S.No turns) 2 11.42 705 3 40 14.25 348.31 165 160 913.6 CALCULATIONS TL Rigidity Modulus, (0.0060 3,53x 10 m Polar Moment of Inertia, I Modulus of Specimen Torsion Input Angle Specimen (Hand wheel torsion Angle torsion Angle Moment (N.m) Rigidity IG S.No N/mm [in radial 2 1142 020 705 025 608 4 61 348.31 456.8 160 9136 15.95 15.5 The graph is straight in the initial portion whose slope is constant and hence the rigidity modulus is 0.75 N/mm? 16T 16x 16.5 Tad' (0.075)Explanation / Answer
In the torsion testing, the relationship between applied torque and the angle of twist is graphically plotted and parametres such as ultimate torsional shear strength, shear strengh and shear moduls are investigated.
For carrying out the experiment, you have to initially mount the workpiece given on the machine. To mount the workpiece, both ends of the given specimen are tightened to the hexagonal sockets in which one is fitted to a torque shaft and other is fitted to an input shaft. By turning the handwheel , you can apply twisting moment and this has to apply till the specimen fails.
when the twisting moment is applied, the torque is reacted by a torque shaft,which moves in relation to the defelction arm. the movement of deflection arm is measured by a linear potentiometer, which is connected to a caliberated digital torque meter which will give you the reading of torque. The degree of rotation can be noted from the proctractors given in the machine.
Since we know the value of torque and the degree of rotation from the experimental observation, and being known the values of Length, diameter of the specimen,
by using the Torsion equation mentioned in the attachement, you can find the torsion.
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