The Universal Materials Tester mod. CETR-UMT 2 is capable of performing standard tensile tests as per

ASTM D638-02 and ASTM D3039-00. In addition UMT can also be successfully used for performing

repetitive tension, torsion, compression and twisting tests for fatigue, if performed for sufficient number

of test cycles.

Test specimens; sheets, plates and molded plastics, prepared by either into dog bone shapes as

specified in the ASTM D638 or into thin flat strips per ASTM D3039. UMT users have option of

performing tensile tests in either load-controlled or displacement-control mode. The force (Fz), and

displacement (Z-carriage position) can be recorded as a function of time during the test.

In force-controlled tests, the displacement Z changes with the test cycles; in displacement-controlled

test, the force Fz changes as the test progresses.

UMT Hardware Configuration:

CETR-UMT 2 system with load sensor (maximum 1200N), lower stationary table and specimen grips.

Measurement of Tensile Properties of Plastics and Composites on Universal Materials Tester

ASTM D638-02a, ISO 527-1 and ASTM D3039/D3039M-00. mod. CETR-UMT 2 per

Force and displacement (Z) vs. time plots Stress-strain plot after processing Fz-Z data

Displacement-controlled Tensile Test

SEQUENCE 1: To move up the carriage for tensile testing

Step 1:

Carriage : set offset = 20 mm or distance as required; Direction -up , Duration- 10 s or as per

required strain rate.

Slider : Idle

Upper Grip

Lower Grip

Tribology and Mechanical Testing Unit

Application Note

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Load-controlled Tensile Test

SEQUENCE 1: To apply a small initial load

Step 1:

Carriage : small initial load with no negative sign,

duration- 5 s

Slider : Idle

SEQUENCE 2: To apply a linearly increasing load

Step 1:

Carriage :set initial load from step 1 in

Sequence 1, and final load with no

negative sign, Duration- 10 s or as per

required loading rate.

Slider : Idle

Stress-strain plot after processing Fz-Z data

Force and displacement vs. time plots

Report:

Use the Viewer program to plot test results. Select the parameters to be displayed by checking the

appropriate boxes under Parameters on the Viewer screen. Open the test data file with the UMT Viewer.

Check (select) both the parameters (Fz and Z) and then click on the combo (arrow) of the "Elastomer

Graph" button. Click on 'Tensile Stress' to open a calculation window. Enter relevant parameters related to

the test specimen, such as shape and dimensions then click on 'Calculate" button to calculate the

mechanical properties of the specimen and to make a stress vs. strain plot. For printing the plots and the

calculated data, click on Print button. You can also obtain a preview by clicking on the 'print preview' button.

To calculate the chord and secant modulii between two points, place two markers by clicking right mouse

button on the stress vs. strain plot and press 'Calculate". UMT Viewer is capable of calculating yield

strength, ultimate strength, Young's modulus, chord modulus, secant modulus, percentage of elongation,

toughness, and energy at yield point from load-displacement data of the specimen.

Summary

Universal Materials Tester UMT is capable of performing numerous mechanical tests to obtain yield

strength, ultimate strength, Young's modulus, chord modulus, secant modulus, percentage of elongation,

toughness, and energy at yield point from load-displacement data (stress-strain) of test specimen. UMT is

also capable of synchronized and repetitive tension/compression and torsion testing for fatigue conditions.

1717 Dell Avenue, Campbell, CA 95008, USAPhone: +1.408.376.4040 Fax: +1.408.376.4050

Email: productinfo@bruker-nano.comWeb: www.bruker-axs.comPage 2

Application Note

Tribology and Mechanical Testing Unit

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