Peak Load, Test Duration And Effective Load Rate; Load Rate Warning - Proceq DY-2 series Operating Instructions Manual

Note: If you do not wish to record the failure mode, simply press on save to complete the
test. The test will be saved and you will return to the main menu.

5.2.1 Peak load, test duration and effective load rate

The peak load is the maximum load achieved during the test.
The test duration begins when the load reaches 250 N (56 lbf) (load rate control begins) and ends at
the time when the end of test criteria is reached. If this is set to 0 % this can be misleading. Look at
the graphical output in this case for confirmation.
The effective load rate is calculated from the point at which load rate control begins (250N) to the
time at which 80 % of the peak load is reached. (This is done to avoid inconsistencies in load rates
caused by non-clean breaks when elastic and thermoplastic materials are being tested.)

5.2.2 Load rate warning

Pull-off testing from a single side, is best suited for rigid substrates. Deformable substrates or elas-
tic coatings can lead to a falsification of the results of a pull-off test. Proceq DY-2 provides the tools
to help in the analysis when testing on such materials.
If the load graph appears on the measurement screen as a blinking icon during a test, it indicates
that the programmed load rate cannot be achieved.
The most likely cause of this is due to plastic deformation of either the substrate or the material
under test or the selection of a load rate beyond the capabilities of the instrument (see technical
specifications).
It is recommended in this case to store the test result and download it to DY-Link for detailed
analysis.
© 2014 Proceq SA
On completion of the test the summary screen shows the peak load,
test duration and the effective load rate. The motor winds back auto-
matically ready to begin the next test.
Press the center key to enter "Failure Mode Recording". (See below.)
Press on save to complete the test and return to the main menu.
If you do not wish to save the test, select the delete icon and press the
center key to return to the main menu.
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