Skip to content
Updated Lab 02 for ME3263
Jupyter Notebook TeX Python
Branch: master
Clone or download

Latest commit

Fetching latest commit…
Cannot retrieve the latest commit at this time.

Files

Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
.ipynb_checkpoints
__pycache__
results-dice
.DS_Store
ME3263_Lab-02.ipynb
README.md
check_lab02.py
figure_01.png
figure_02.png
figure_03.png
least_squares-error_with_covariance.pdf
notebook.tex
pretty_plots.py

README.md

ME 3263 Introduction to Sensors and Data Analysis (Fall 2018)

Lab #2 - Static beam deflections with strain gage

What is a Strain Gage?

A strain gage consists of a looped wire that is embedded in a thin backing. Two copper coated tabs serve as solder points for the leads. See Figure 1a. The strain gage is mounted to the structure, whose deformation is to be measured. As the structure deforms, the wire stretches (increasing its net length ) and its electrical resistance changes: $R=\rho L/A$, where $\rho$ is the material resistivity, $L$ is the total length of the wire, and $A$ is the cross sectional area of the wire. Note that as $L$ increases, the cross sectional area changes as well due to the Poisson contraction; the resistivity also changes.

Figure 1: a) A typical strain gage. b) One common setup: the gage is mounted to measure the x-direction strain on the top surface. It's engaged in a quarter bridge configuration of the Wheatstone bridge circuit.

Figure 1: a) A typical strain gage. b) One common setup: the gage is mounted to measure the x-direction strain on the top surface. It's engaged in a quarter bridge configuration of the Wheatstone bridge circuit.

You can’t perform that action at this time.