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ABSTRACT

This experiment is performed to understand the principle of torsion test

and also to determine the modulus of shear, G through measurement of

the applied torque and angle of twist. The variation of pure shear when a

structural member is twisted is called torsion. The torsional forces produce

a rotating motion about one end to another end of the member.

Two dierent specimens have been used in this experiment which is

Aluminium, specimen A and Brass, specimen B. The dimension for the

both specimen is measured and recorded before the experiment begin.

The torque measuring unit is calibrated rst b inspecting the read out

torque from amplier to be similar with the applied torque. The test is

then performed. To avoid some measurement errors several measure were

ta!en which can aect the results.

The test specimen is place between the loading device and the torque

measuring unit. The reading from the amplier is ta!en out each time

when the load is applied. The results were ta!en and some calculations is

performed using the formula given in the lab manual which is the applied

torque, angle of twist, number of revolutions and the percentage error and

from the results obtain a graph is plotted. The modulus can be determined

when the specimen is still wor!ing under the elastic limit.

Based on the results obtained, it is concluded that Aluminium, specimen A

is more ductile than Brass, specimen B. The G value for Brass theoreticall

is larger than Aluminium, hence it is harder to twist than Aluminium. The

torque needed to twist Brass to the same amount degree of rotation as

Aluminium is greater.

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MECHANICS AND MATERIALS LABORATORY (MEMB221)

SEMESTER 2, 2015/2016

EXPERIMENT 2 : TORSION TEST

DATE PERFORMED : 3rdDECEMBER 2015

DUE DATE : 10thDECEMBER 2015

SECTION : 05

GROUP : 04

GROUP MEMBERS I / D NUMBER

Mithradassa Nair A! G Dha"#dhara$ ME0%5512

S#r$a &ai'ash A! &a$$a$ &(r())a' ME0%55*%

Ra+,,$ A! Thi-a.(.#/a' ME0%552

Pra.at,sh &("ar A! Ash#) &("ar ME0%55

Sar+aisa$ A! M($ia$d- ME0%55*0

LAB INSTRUCTOR: Ci) N(ras'i$da Bi$ti A$(ar

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TABLE OF CONTENT

SUMMAR ABSTRACT 1

OBECTIE

TEOR

E6PERIMENT E7UIPMENT

PROCEDURE

DATA AND OBSERATIONS

ANA!SIS AND RESU!TS

DISCUSSIONS

CONC!USIONS

REFERENCES