Lab #2: Poisson’s Ratio - Rochester Institute of Technology · PPT file · Web view · 2014-03-13Title: Lab #2: Poisson’s Ratio Author: Dr. Surendra Gupta Last....

Lab #1: Poisson’s Ratio Determine Poisson’s Ratio Determine Elastic Modulus

ASTM Standard E132

Principle

Equations

Plotting Strains

Volume Change

Volume Change in Metals

Strain Gage

Testing Equipment Universal Testing Machine (UTM)

Tension, Compression and Flexure Monotonic Static Tension Test

Single direction, Load increased slowly Crosshead Motion

Motor-driven Screw Hydraulically-driven Crosshead

Testing Methods Displacement Control

Open loop, Most Common Load Control

Close Loop Feedback, Expensive Strain Control

Close Loop Feedback, Expensive

Collecting Data

Perform the Experiment Please be careful in Load Control The piston can move wildly at high

speeds if The specimen is not properly

mounted Specially tuned parameters are not

loaded

Computing Stress = F/A0

Area = Width * Thickness

Stress = Load / Area

Note $C$4

Computing Elastic ModulusSelect data points by clicking on any and then Right-click and choose “Add Trendline”

Computing Poisson’s RatioSelect Transverse Strain Line, and Right Click, and choose “Format Data Series”

Material Properties Table