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The damping is expressed as tangens for the loss angle (). Damping is a measure of the energy loss and of heat generation in the test piece. Rebound resilience is a fundamental property of rubber and it is also one of the oldest and simplest tests. The testing is usually conducted as a rebound test, in which a weight is bounced against the rubber, either in the form of a pendulum or a free falling ball. By comparing the height of the rebound with the original height, one can get a measurement of the energy that has been absorbed by the damping effect of the rubber. The results are generally given as the rebound height in percentages of the fall height. The two most regular devices are the Lpke and Schob pendulums. เว็บ โรงเรียน ฤ ทธิ ยะ วร ร ณา ลัย 2 If a rubber test piece is stretched for a time and then unloaded, it does not totally retract to its initial length. The difference is called the tension set. In this test, rubber test specimens are loaded with weights using a load of 2.5 MPa at room temperature. After an hour, the samples are unloaded and the tension set is established after a 10 minutes recovery period.
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