geometric dimension

1. Determine the geometric dimension such as width, breadth and thickness of each
specimen. This can be accomplished using the Vernier calipers. This information will be
used to calculate strains.
2. Open the safety shield and install appropriate grips for compression testing.
3. Turn on the load frame and data acquisition PC-desktop.
4. Run the software NEXYGEN EZ/LR console on the computer workstation. Right mouse
click on the desktop opens a new NEXYGEN Batch Document. Select appropriate
compression test e.g. General Purpose or Plastics.
5. For safety, move away from the desktop station.
6. Go to the test stand LCD control panel. Press a button to edit test set up. If you want to
get out of sub-menus press the Enter key. Make sure that:
• Test type is Compression with a Limit Load of 100KN (not Cyclic).
• An appropriate test speed is specified.
• A slow crosshead jogging speed is specified. Leave it as default setting of
• The safety load is less than or equal to 112lbf.
• Grip Protection load is less than 100KN for both tension/compression.
7. Enter the test specimen information.
8. Load the specimen in the testing machine. Ensure that the specimen is placed in the
center of the grip.
9. Specify the maximum “compression”. Specify maximum deformation. Please do not
more than 20% of original thickness. For example, for 10mm specimen, use 3mm.
10. Close the splinter shield. Run the test from the computer (i.e. press the play button on
the toolbar). Press the Home key on the keyboard to update plot scale.
11. When the test is finished, remove the specimen.
12. Using the Vernier calipers, measure and record the geometrical dimensions.
13. When you have finished recording the data. Repeat the procedure for other specimen.
14. Estimate the experimental value of Young’s Modulus for the both test specimen. Are
these values reliable? If not, why not?
15. Plot the stress (MPa) vs. strain (%) curve for each specimen. The slope of the initial
linear portion of the stress-strain curve is the modulus of elasticity, or Young’s modulus.
The modulus of elasticity, E, is a measure of the stiffness of materials.


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