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Torsion

The document outlines the procedure for conducting a torsion test on mild steel specimens to determine the modulus of rigidity and angle of twist. It includes a list of necessary apparatus, a theoretical background on torque and torsion, and a step-by-step procedure for the experiment. Additionally, it presents observations, results, and potential viva questions related to the test.

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Amanulla Mulla
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11 views3 pages

Torsion

The document outlines the procedure for conducting a torsion test on mild steel specimens to determine the modulus of rigidity and angle of twist. It includes a list of necessary apparatus, a theoretical background on torque and torsion, and a step-by-step procedure for the experiment. Additionally, it presents observations, results, and potential viva questions related to the test.

Uploaded by

Amanulla Mulla
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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EXPERIMENT No. 2 TORSION TEST AIM: To conduct torsion test on mild steel specimen to find modulus of rigidity or to find angle of twist of the materials. APPARATUS: 1. A torsion test machine along with angle of twist measuring attachment. 2. Standard specimen of mild steel or cast iron. 3. Steel rule. 4. Vernnier caliper or a micrometer. DIAGRAM: TORSION TEST — Angle 8 TORQUE THEORY: For transmitting power through a rotating shatt it is necessary to apply a turning force. The force is applied tangentially and in the plane of transverse cross section. The torque or twisting moment may be calculated by multiplying two opposite turing moments. It is said to be in pure torsion and it will exhibit the tendency of shearing off at every cross section which is perpendicular to the longitudinal axis. Torsion equation: ‘= maximum twisting torque (N mm) Ip= Polar moment of inertia (mm*) N shear stress, mm N C= modulus of rigidity © = angle of twist in radians L = length of shaft under torsion (mm) PROCEDURE: 1. Select the suitable grips to suit the size of the specimen and clamp it in the machine by Adjusting sliding jaw. 2. Measure the diameter at about the three places and take average value. 3. Choose the appropriate loading range depending upon specimen. 4, Set the maximum load p er to zero 5. Carry out straining by rotating the hand wheel or by switching on the motor. 6. Load the members in suitable increments, observe and record strain reading. 7. Continue till failure of the specimen. 8. Calculate the modulus of rigidity C by using the torsion equation. 9. Plot the torque twist graph (TT vs 6) OBSERVATIONS: Gauge length L = roirmnenotinatis fp = Modulus of rigi TABLE: S.No | Twisting Moment [Twisting [Angle of — | Twist Modulus of | Average C Moment — | Twist (Radians) _ | rigidity (C) Kgf-m N N-mm. (Degrees) —= mam’ RESULT: The modulus of rigidity of the given test specimen material is VIVA-QUESTIONS: 1. What is torque? 2. What is torsion equation? 3. What is flexural rigidity? 4. Define Section modulus. 5. What is modulus of rigidity’? APPLICATIONS: 1 Structural members 2.Powertransmission of shafts 3.Mixer

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