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Thus a temperature sweep can be done, where the modulus is measured as function of the temperature. The dynamic properties of products are analyzed in servo hydraulic universal testing equipment, available in sizes with loads up to several 100 kN. The machines have a hydraulically driven piston, which can vibrate the product under test up to around 100 Hz and a loadcell measuring the force. As rubber is a viscoelastic material, modulus and damping differ with deformation, frequency and temperature. By dynamic testing, the so-called complex dynamic modulus and the loss angle are determined. 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 ฤทธิยะวรรณาลัย ประถม measurement of the energy that has been absorbed by the โรงเรียน ฤ ทธิ ยะ วร ร ณา ลัย 1 ประถม damping effect of the rubber. The results are generally given as the rebound height in percentages of the fall height.
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