Exp 8 Lab Report
.pdf
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School
University of Alabama, Huntsville *
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Course
375
Subject
Aerospace Engineering
Date
Dec 6, 2023
Type
Pages
8
Uploaded by PresidentAtomHedgehog21
1
MAE 375 Section
(08)
Experiment
(8): (Modulus of Elasticity Flexure Test)
Experiment Conducted:
(09/15/2023)
Report Submitted:
(09/15/2023)
Author:
(John Holland)
Group Team:
(A3)
2
I.
Objective and Expectations:
The goal of this experiment was for us to calculate the modulus of elasticity based on measured values of stress
and strain, and compare it to the standard value of the modulus of elasticity for that type of metal. I expect that
the calculated value of modulus of elasticity will be close to the standard value.
II.
Experimental Procedure:
1.
Schematic of the Specimen:
Figure 1: Full schematic of the full set-up of the
experiment’s equipment
.
3
Figure 2: Top and side view drawings of the aluminum cantilever beam with attached strain gauge used in this
experiment. Le represents distance between center line of strain gauge and the place where load is applied. P is
the applied load.
)
2.
Description of Equipment:
•
Cantilever flexure frame
•
Aluminum cantilever beam with strain gauge attached
•
P-3 strain indicator
•
Calipers
•
Ruler
•
Scale
•
Weights and weight hanger
3.
Procedure:
First, use the calipers and tape measurer to record the effective length (Le), thickness (t), and width (b), and record
the gauge factor (Sg) indicated on the beam. Using the recorded values, calculate the maximum load (Pmax) for
the beam using a stress of 15,000 psi with the given equation 7.3-3.
Next, secure the beam into the flexure frame and connect the wires of the strain gauge into the strain indicator,
and set up the strain indicator by activating the correct channel, selecting the gauge factor, and zeroing the strain
indicator.
Next, determine the 10 different loads that will be applied to the beam, making sure to not exceed Pmax, and then
apply these loads onto the beam in 10 increments, recording the load and strain for each increment, before
unloading them in 10 decrements, recording load and strain again for each. At
–
at
Finally, using the given formula 7.3-3, calculate the stress for each load increment and decrement.
4.
Introduction of Equation/s:
? =
Δσ
Δε
𝜎 =
6𝑃 × 𝐿
𝑒
? × ?
2
(7.3-1)
(7.3-3)
where:
E
= modulus of elasticity, in psi
σ
= stress measured in psi
𝛥𝜎
= change in stress
ε = strain in in
./in.
𝛥
ε
= change in strain
P
= applied load
L
e
= effective length, between gauge center point and point where load is applied, in in.
b
= width in in.
t
= thickness in in.
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