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Engineering Materials I (ENME502)
Laboratory
WZ325, Weeks 3-4, July/August 2024
(Please see the attached for grouping and the time for each group to attend)
Title: Mechanical Properties of Materials
Objective: Firstly, conducting this laboratory tests and the analysis of the data obtained serve
to develop a good understanding on:
a. how strength of materials is determined,
b. how elastic modulus maybe estimated,
c. how tough (or brittle) materials maybe evaluated.
Secondly, this laboratory is for students to obtain firsthand property data and, being equally important, to obtain the property
values determined from the laboratory tests to support the learning in this course/paper on:
a. what elastic modulus values of materials depend on,
b. what affect the strength and fracture strain of materials,
c. what are the methods of strengthening of metallic alloys,
d. what properties are important for forming in solid state.
Specimen: To serve the above objective, testing will be conducted using six (6) samples
from selected materials: one (1) each low strength and medium strength aluminium alloy sample, one (1) each
low strength (mild) and medium strength steel sample, one (1) thermoset and one (1) thermoplastic polymer sample.
In the gauge length section of the samples: gauge length is 31 mm, width (machined to be) is 6 mm, thickness is nominally 3 mm,
The exact values of the thickness of the samples and widths will be measured during the tests.
Equipment: Tensile testing machine and the associated displacement measurement (a. cross head and b. using an extensometer)
and data acquisition facility/software.
Procedures: Tensile testing will be conducted with the cross head speed at 3 mm/min
(viscoelastic/plastic behaviours not considered in this lab). Load and extension (both cross head and clip edge displacement) will
be recorded during each test thus students will be provided with the full sets oftest data.
Note: Students will come one group after another to the lab during the lab time so each student can come and take
part in at least one test. Testing of samples will be recorded and the recording will be made available in Canvas.
