From 6a7769e114df85ae4e0c2902da184e5da084293b Mon Sep 17 00:00:00 2001 From: "Ryan C. Cooper" Date: Thu, 13 Sep 2018 15:22:31 -0400 Subject: [PATCH] added lab 2 --- README.md | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index c7e2a78..b81a805 100644 --- a/README.md +++ b/README.md @@ -17,13 +17,40 @@ for the writing assignment portions. Take turns as first author and co-author. The group shares the pass/fail grade for the "lab report" grade. -## Repository for laboratory notebooks +# Repository for laboratory notebooks *To access notebooks and interactive lab material, sign into github.uconn.edu, then follow the link to the class server.* -## [ugmelab.uconn.edu](https://ugmelab.uconn.edu) +# [ugmelab.uconn.edu](https://ugmelab.uconn.edu) -### Lab #1 - Measurements of machining precision and accuracy +# 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_01.png) + +*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.* + + +# Lab #1 - Measurements of machining precision and accuracy [Lab 1 github files](https://github.uconn.edu/rcc02007/ME3263_Lab-01.git) @@ -47,7 +74,7 @@ No measurement is exact. No surface is compeletely flat. Every measurement you make has two types of uncertainties, systematic and random. Systematic uncertainties come from faults in your assumptions or equipment. -### Lab #0 - Introduction to the Student t-test +# Lab #0 - Introduction to the Student t-test **Outline and figures due Wed 9/5 by 5pm**