ChemInstruments AR-2000 Operating Instructions Manual page 23

The term Peel Rate describes the separation rate at the peel junction, the point where
tape separation from a test panel occurs.
The term Crosshead Rate describes the rate of the mechanism that move the test
panel.
Consider a triangle that makes up the pulling and peeling functions on a Tensile
machine. The peel and crosshead rates are equal since the peeling action is performed
in the horizontal leg of the triangle and motion occurs in the vertical leg. Since the
triangle is a right triangle when performing a 90˚ peel, the legs are equal and thus so is
the Peel Rate with respect to the Crosshead Rate.
Consider a triangle that makes up the pulling and peeling functions on an AR-2000
machine. The peel and crosshead rate are not equal since the peeling action is
performed in the load cell leg of the triangle and motion occurs in the hypotenuse. The
Peel Rate is therefore a factor of the angle between the load cell leg and the
hypotenuse, simple trigonometry applies here. Since the triangle is a right triangle
when performing a 90˚ peel, the load cell leg is shorter than the hypotenuse and thus
the Peel Rate is less with respect to the Crosshead Rate. Knowing the 90˚ angle of
peel and using a Crosshead Rate of 12 inches/minute, the math in the above noted
example works out to a Peel Rate of 8.5 inches/minute.
Therefore, general formulas for a sled type machine such as the ChemInstruments AR-
2000 is thus:
Peel Rate = 0.707 * Crosshead Rate
Crosshead Rate = Peel Rate / 0.707
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Adhesion/Release Tester Operating Instructions (AR-2000)