The Coefficient of Restitution Tester – A Value Making Impact

The procedure when at least two bodies hit against each other is said to be a collision. In general, a collision refers to an event in which at least two bodies/objects apply forces on each other for a very short period of time. Collisions conserve momentum. The Coefficient of Restitution (COR) is the proportion to the final relative velocity to initial relative velocity between two bodies after their collision. It typically ranges from 0 to 1 where if the calculated value is 1, the collision is said to be a perfectly elastic collision. This also means that there is no loss of kinetic energy during a collision. But if the value is calculated as 0 it does not make the collision perfectly inelastic. There are various tests conducted that calculates the coefficient of restitution tester.

Coefficient of restitution tester

The Coefficient of Restitution is denoted by ‘e’.

The coefficient of restitution is the number which shows that how much kinetic energy remains after the collisions between two bodies.

It depends upon the materials of which the two colliding bodies are made of. It is also influenced by the velocity, the size and shape of objects, the location at which collision of two objects occurred, and their temperature.

The coefficient of restitution is the measure of the restitution of collision between two colliding bodies: how much amount of kinetic energy remains for the objects to overcome from one another vs how much kinetic energy is lost in the form of heat, or the work done deforming the bodies.

There are tests that ascertain the coefficient of restitution. One of the tests is Leeb Rebound Hardness Test. This test is predominantly on substantial items and it is a non-destructive testing test. This implies the required data can be figured without causing harm or any kind of deformation to the material. The ordinary systems depend extremely much on characterized physical space hardness tests. Hard indenters of characterized measurements are continually squeezed into the material under a particular power. Distortion parameters, for a case, the indentation depth in the Rockwell technique, are recorded to give measures of hardness. Leeb guideline characterizes hardness value from the energy loss of a characterized affect body in the vigil of impacting being crashed on a metal sample.

Drop Test is another way to calculate the Coefficient of Restitution for the different type of balls. It is found that the coefficient of restitution values drop as the height of the drop is increased. It has been noted that the value of the coefficient of restitution drops as the height drop is also increasing. The variation in the material of impact surface changes varies the coefficient of restitution.