1. Lab #1: Poisson’s Ratio Determine Poisson’s Ratio
Determine Elastic Modulus
ASTM Standard E132

2. Principle

3. Equations

4. Plotting Strains

5. Volume Change

6. Volume Change in Metals

7. Strain Gage

8. 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

9. Testing Methods Displacement Control Load Control Strain Control
Open loop, Most Common
Load Control
Close Loop Feedback, Expensive
Strain Control

10. Collecting Data

11. 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

12. Computing Stress = F/A0 Note $C$4 Area = Width * Thickness
Stress = Load / Area

13. Computing Elastic Modulus
Select data points by clicking on any and then Right-click and choose “Add Trendline”

14. Computing Poisson’s Ratio
Select Transverse Strain Line, and Right Click, and choose “Format Data Series”

15. Material Properties Table