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University of Akron *
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300
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Material Science
Date
Dec 6, 2023
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Introduction to Material Technology Laboratory Report
Lab Course
Number &
Instructor
2920:142-013
Instructor
Use
Author
Taylor DaGrava, Deleno
Domenico, William Korecky
Team Number
Team 4
Grade
Lab Activity
Number & Title
(Draft or Final)
Lab 3
Date Submitted
4/3/2020
Description
To investigate the stress/strain (Force/Deflection) and to determine the Ultimate Strength, Yield
Strength, Modulus of Elasticity, Percent Elongation, Percent Reduction in Area, and Toughness
and Resilience.
Measure and record the initial and final specimen dimensions.
Record the
deflection at varying applied loads on the Instron Tensile Test Machine. Compare Ultimate
tensile strength in this lab to estimated results using hardness data collected in Laboratory 5.
Procedure
Measure and record the width of the initial gage (narrow) section (Wo) and the thickness (To)). Use
inches for all measurements. Record these values on the worksheet on p. 4 to be shared with the other
lab team, collect corresponding data on other sample from that team
Calculate the initial cross-sectional area
Pencil a line at the centerline of the length of the narrow width. Pencil two lines each 1” on either side of
the above centerline, along the length of the narrow width. The marks 2” apart will be used to align the
extensometer on the specimen as well as serve as the gage length, Lo. Overwrite the pencil lines with a
fine black permanent marker
Place the specimen in the tensile test grips with the black lines on the left and resting against the back
stop. Center specimen vertically in the grips. Tighten lower grip then upper grip, so the specimen does not
move during the tensile test.
Attach the extensometer to the specimen carefully, so that the attachment blades on the extensometer
align with the two pencil lines that are 2” apart and the knife edges do not scratch the specimen.
The instructor will run the computer to conduct the tensile test, while the students are observing the
tensile test specimen distortion and computer plots of stress vs. strain and load vs. elongation.
When the test is paused, the instructor will have the students remove the extensometer before resuming
the test. Use care again to prevent scratching the specimen.
Students will receive the raw data files of the two tensile tests in an email from the instructor. These are
CSV files that can be opened in EXCEL. Students will use EXCEL to determine the tensile test properties
of the two materials
After testing, fit the ends of the fractured specimen together and measure the final gage length (Lf), width
(Wf), and thickness (Tf). Record these values on the worksheet on p. 5 to be shared with the other lab
team, collect corresponding data on other samples from that team on your worksheet.
Calculate the final cross-sectional area
Calculate % elongation and % reduction in area
Equations:
Results
Specimen:
Wo
To
Lo
Ao
Wf
Tf
Lf
Af
Brass
.500
.186
2
.093
.415
.162
2.452
.067
Aluminum
.501
.193
2
.097
.458
.165
2.197
.076
Specimen:
% Elongation
% Reduction in Area
Brass
22.6
27.7
Aluminum
9.9
21.8
Specimen:
Elastic
Modulus
(psi)
0.2 % offset
yield
strength
(psi)
Ultimate
tensile
strength
(psi)
Modulus of
resilience
(psi)
Modulus of
toughness
(psi)
Brass
2.81 x 10
6
52500
62500
262.5
2363
Aluminum
1.91 x 10
6
37500
41800
112.5
3640
Aluminum
Graphs:
Brass
Graphs:
Pictures of Test Specimens:
Aluminum:
Your preview ends here
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