assignment lab - Engineering
assignment labSpring 2021
Remote
Tensile Metals Experimental Data
Table 1. Data on specimen measurements.
Material Initial
Thickness
(mm)
Initial
width
(mm)
Initial
area
(mm)
Initial
gage
length
(mm)
Final
thickness
(mm)
Final
width
(mm)
Final
area
(mm)
Final
gage
length
(mm)
Aluminum 3.0 13.5 40.5 50.8 2.5 12.5 31.25 56.5
Steel 3.0 13.5 40.5 50.8 2.0 8.5 17 66.5
Brass 3.1 13.5 41.85 50.8 2.5 10.5 26.25 64.5
Copper 3.0 13.2 39.6 50.8 1.5 10.5 15.75 69.0
E = (L-Lo/Lo)*100\% Ar =(Ao-Af/Ao)*100
L−L0
L0
) ∗ 100\% Ar = (
A0−Af
A0
) ∗ 100
Ductility equation:
Where:
E - percent elongation (\%)
L0 - original length
L - final length
A0 - original cross-sectional area
Af - the final cross-sectional area
Ar
- percent reduction in areaENGR 200: Materials of Engineering
Laboratory 3
Tensile Test I.
OBJECTIVES
The purpose of this experiment is to familiarize the students with performing tension tests and obtaining
the strength and ductility values from the test results of several metals. The tensile properties of these
metals will be contrasted, and the properties will be compared with those in reference books.
II.INTRODUCTION
The tensile test is the primary test used in determining the mechanical properties of materials. From this
test, it is possible to determine the yield strength, tensile strength, modulus of elasticity, and ductility of a
given material. This type of data is essential for mechanical and structural designs and is usually compiled
in materials handbooks for commercially available materials.
III. EXPERIMENTAL
Materials and Apparatus
• Instron Tensile Test System (Series 3369, Figure 1)
• Extensometer
• Four tension tests specimens – aluminum (2024 –T4), copper (C 11000), brass (C36000), and
steel (1010 cold-rolled) (see Figure 2)
• Vernier caliper
Aluminum (2024 –T4)
Steel (1010 cold-rolled)
Brass (C36000)
Copper (C 11000)
Figure
1:
Instron
Tensile
Test
Machine,
Series
3369
Figure
2:
Tensile
Test
specimens.
Figure 3: Tensile Test Specimen
Experimental Procedure
1) 4 groups will test 1 specimen each, which is made of one of the following metals: aluminum
(2024 –T4), copper (C 11000), brass (C36000), and steel (1010 cold-rolled)
2) Prior to testing, measure and label the specimens’ dimensions, and record them in your data sheet.
You may also digitally photograph the specimen.
3) Test procedure:
Turn on the machine and let it warm up for 15 minutes before performing any test.
a) Specimen preparation
• Mark a 2’” (50.8 mm) gage length within the center portion of the specimen using a marker pen.
(see Figure 3 for the location of the gage length)
b) Attach specimen to grip assembly
• Mount the specimen to the upper grip assembly and allow it to hang freely. This is to minimize
side loading or bending moment created in the specimen.
• Make sure the faces of the grip cover the entire area to be gripped; otherwise your specimen may
slip or even break inside the gripped area (“jaw break”). Tighten the clamp.
• Repeat the same procedure for the lower grip assembly, and tighten the lower clamp
c) Set up test program
Check to ensure that these parameters are entered accurately in the right fields:
-Gage length
- Sample thickness
- Ambient temperature
d) Testing
• Zero out all the load and strain values on the specimen as shown on the screen
• Begin the test – the cross-head will begin to move at a pre-determined speed
• When the pre-set strain value is reached and the cross – head stop moving, remove the
extensometer.
• Continue the test until the General Materials Test
Sample name C:\Users\SCI 164\Desktop\ENGR 200 10 Fall
2019\ENGR-200-10-Steel_Fall_2019.is_tens
Rate 1 12.70 mm/min
0
2000
4000
6000
8000
10000
12000
14000
16000
-3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Lo
ad
[
N
]
Extension [mm]
Specimen 1 to 1
Specimen #
1
Material Type Rate 1[in/min]
Gauge
Length
[in]
Width
[in]
Thickness
[in]
Maximum
Load
[N]
Maximum
Load
[lbf]
Extension
at
Maximum
Load
[mm]
Extension
at
Maximum
Load
[in]
Strain 1 at
Maximum Load
[\%]
Modulus
(Automatic
Youngs)
[MPa]
1 steel 0.50 2.000 0.531 0.118 15118.062 3398.675 4.333 0.171 -1.507 222829
10/3/2019 2:00:18 PM
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