Lab 3
docx
keyboard_arrow_up
School
Old Dominion University *
*We aren’t endorsed by this school
Course
225
Subject
Aerospace Engineering
Date
Dec 6, 2023
Type
docx
Pages
7
Uploaded by cdhhankins
Lab 3
Christian Hankins
9/27/2023
OLD DOMINION UNIVERSITY
MAE 225 Solid Mechanics Lab II
Introduction:
For this experiment we look at data from lab 1&2 that we got from the Aluminum specimen and use it to
compare several different material characteristics that were calculated from the data. With the
experimental data we are going to use the program MATLAB to plot both the experimental data and the
calculated data found through using mathematical equations giving us the theoretical data. Plotting
these we can also investigate how similar the experimental data is to the calculated data by using the
line of best fit comparing the closeness of the slope of the two different data sets. Using equations such
as RMS error we have an equation that is programmed into the code to give us the amount of similarity
or difference in the two data sets. We are going to plot both the stress vs strain and the longitudinal
strain vs transverse strain from this we can see what the Poisson’s ratio and the modulus of elasticity
from these plots and how similar it is to the theoretical calculations from the program.
Stress Vs Strain:
Code:
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
Graph:
Line of Best Fit Slope:
m=69.6989
Line of Best Fit Y-int:
b=-9.0396e-04
RMS Error:
0.0025
Longitudinal Strain Vs Transverse Strain:
Code:
Graph:
Line of Best Fit Slope:
m=0.3271
Line of Best Fit Y-int:
b=4.2182e-05
RMS Error:
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
6.8078e-06
Results:
P(kN)
Lab 1&2
Lab 3
%Diff
E(GPa)
69.995729
69.6989
0.57%
v
0.2963
0.3271
9.88%
Discussion:
Completing this lab, we now know that we have different ways to find modulus of elasticity and
Poisson’s ratio. It is clear that both methods in lab 1&2 and the methods in lab 3 are equally effective in
solving for these important material characteristics. In the data we find that both the Poisson’s ratio and
modulus of elasticity are eerily similar to the data found in the earlier lab 1&2. The percent difference in
the two labs is some what marginal with the consideration of potential human errors and other
unforeseen errors being possible. In this lab it is clear that when trying to confirm the materials
characteristics it is imperative to run multiple different types of test on the material in different ways to
see the variation in the results.