Standard Test Method for Rubber Property—Resilience Using Schob Type Rebound Pendulum

Importancia y uso:

4.1 The Schob Type rebound pendulum is designed to measure the percentage resilience of a rubber compound as an indication of hysteretic energy loss that can also be defined by the relationship between storage modulus and loss modulus. The percent rebound measured is inversely proportional to the hysteretic loss.

4.1.1 Percentage resilience or rebound resilience are commonly used in quality control testing of polymers and compounding chemicals.

4.1.2 Rebound resilience is determined by a freely falling pendulum hammer that is dropped from a given height that impacts a test specimen and imparts to it a certain amount of energy. A portion of that energy is returned by the specimen to the pendulum and may be measured by the extent to which the pendulum rebounds, whereby the restoring force is determined by gravity.

4.1.2.1 Since the energy of the pendulum is proportional to the vertical component of the displacement of the pendulum, it may be expressed as 1 – cos (of the angle of displacement) and percentage rebound resilience. RB, commonly called percentage rebound, is determined from the equation:

4.1.2.2 The rebound resilience may be calculated as:

where:

h   =   apex height of the rebound, and H   =   initial height.

4.1.2.3 The rebound resilience may also be determined by the measurement of the angle of rebound α. From the rebound angle α, the rebound resilience in percent is obtained according to the following formula:

Subcomité:

D11.10

Referida por:

E1136-19

Volúmen:

09.01

Número ICS:

83.060 (Rubber)

Palabras clave:

impact; oscillatory device; pendulum rebound; rebound; resilience; rubber;