StudentShare solutions

# Torsion - Lab Report Example

## Extract of sample Torsion

Fenner and other (1984) indicated that the modulus of rigidity is given by the ratio of stress to shear strain often represented mathematically as ?/?. As widely cited, modulus of rigidity is essential in measuring the material’s shear stiffness and it is known to be analogous to Young’s modulus for any elastic behaviour in compression or tension (Benham, Crawford & Armstrong, 1996). Given that a ductile material component useful in providing shear, an individual need to note that the maximum shear stress is safety, which is less than the materials yield shear stress (?y). However, a brittle material the criterion of failure is based upon its tensile stress (Gere &Timoshenko, 1984). Research indicate that the theory of torsion often give the torque in form of rotation as (1) The equation 1 above is often derived from Hooke’s law and it is also valid for the shear stresses though somewhat lower than shearing proportional limit (Case, Chilver & Ross, 1993). In a solid circular section, it has been outlined mathematically that the polar second moment of the area of cross section is given by equation (2) (Ryder, 1969) (2) This implies that from (1), it can be shown that the maximum shear stress, that occurs at r = d/2, is provided by equation (3) (3) This experiment deals with determining yield shear stress along with the modulus of rigidity for the specimen of brass and mild steel of a circular cross section. Apparatus In this experimental set up, there were various sets of apparatus used. Among them were the torsion machine, a torsion bar, a gearbox, a torque meter, two protractors, a counter, and a hand-wheel. This way, a torsion machine was used for carrying out a test involving a specimen that was accommodated within the socket at each end. The 60:1 reduction gearbox served the purpose of manually applying the angular displacement at the left- hand side. The torsion bar was essential in this experiment given that it was used for measuring the torque when at right-side with a torque meter being used for reading digital data. The two protractors listed above were vital in this experiment since they were used for purposes of measuring the rotation of the specimen. They were placed at the gearbox, in which case, one was placed at the input hand wheel along side a 6 degrees scale, while the second gearbox was placed at the specimen shaft at 360 degrees scale. The counter, on the other hand, was used in providing the number of revolutions each of which might be zeroed. Last but not least, the hand-wheel placed at the torque meter assembly was used in returning the right-hand of the given specimen back to the original position. Procedure It is worth enlisting that this lab exercise involved 2 experiments: experiment 1 and experiment 2. This implies that there were specific procedures for specific experimental set up. In experiment 1, which involved determining the modulus of rigidity G for brass and mild steel, the procedure for the experiment involved the following steps. 1. The diameter of the each of the cylindrical portion of the specimen was measured. 2. Using the level, the torque meter hand-wheel was adjusted in ensuring that the torsion bar, as well as the deflection bar is maintained close to and as parallel as possible. 3. The dial gauge was then set to zero through rotating the outer bezel. 4. The specimen was then accommodated in the right hand hexagonal ...Show more

## Summary

EN1048 Engineering Applications Name Institution Abstract In this experiment the modulus of rigidity and yield shear stress are determined for specimens of mild steel and brass of circular cross section. In this case, the shear property was used to measure the maximum torque measured at the notional strength, rigidity and the shear strength by ?…
Author : yjohnson
Save Your Time for More Important Things
Let us write or edit the lab report on your topic
"Torsion"
with a personal 20% discount.
Grab the best paper

### Check these samples - they also fit your topic

Vibration of two degree systems (Aircraft wing)
However, since the elastic stiffness is independent of the flight speed, whereas the aerodynamic moment is proportional to the square of the flight speed, there may exist a critical speed, at which the elastic stiffness is barely sufficient to hold the fin in the disturbed position.
2 pages (500 words) Essay
Flutter Velocity
3. When there is no flow and the rocket's fin is disturbed, say, by a poke with a rod, oscillation or vibration occurs, which is damped (reduction of amplitude caused by structural resistance) gradually over successive vibration cycles. 7. At speeds above this critical condition (UF), any small accidental disturbance of the fin from a gust of wind can serve as a trigger to initiate an oscillation of great violence that will rip the fin right off the rocket causing an unstable flight condition.
2 pages (500 words) Essay
Testicular torsion in neonates
In the neonate, although rare, it is a significant source of morbidity (2). Unlike in adolescents where in the torsion is intravaginal; in the neonates, the torsion is extravaginal with the spermatic cord and the adjacent tunica twisting as a unit (2).
6 pages (1500 words) Essay
Writing a physics report
Generally, as far as this experiment was concerned, three theory equations were applied. These were (1) , Most components used in the current world, are characterized by a shear stress often induced in them when a torque is applied (Hearn,
3 pages (750 words) Lab Report
Construction development in China
The city began to transform with overwhelming ambitions ahead of the 2010 World Expo. Its latest urban hipness symbol is Xiantiandi (Steinhardt & Fu, 2012). The Xiantiandi is a bustling entertainment and shopping district. The center
15 pages (3750 words) Lab Report
Sensors and Control Systems (Electrical and Electronic Engineering)
Combination transducers have both functions; they both detect and create action. E.g. an ultrasonic transducer switches back and forth many times a second
12 pages (3000 words) Lab Report
Determination of principle stress
However, in one plane, normal stress value may be of a maximum value. Such a plane is referred to as the principal plane or maximum principal plane. On the other hand, the normal stress along this plane is referred to as the principle stress or the maximum principle
5 pages (1250 words) Lab Report
Lab Report
On the other hand, yield stress is the point at which a material permanently deforms (Lees, 2011). Stress often causes a material to stretch, which ultimately makes it to strain. In this case, strain it measures the extent a material is stretched.
5 pages (1250 words) Lab Report
Torsion
The applied pressure is hence termed as torque. Materials that are normally used within the manufacturing industries, including beams and metal
5 pages (1250 words) Lab Report