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The Charpy impact test was studied theoretically and experimentally, to learn how much of the pendulum energy is imparted to the test specimen. The fracture was separated from the subsequent collision, and the collision was studied kinematically. Materials are known to have a standard coefficient of restitution between any two bodies . If this value is known, the behavior of the two bodies can be predicted after collision for any two initial velocities of the colliding bodies. This parameter was measured on U-type pendulum impact testing machine at a known initial velocity of the pendulum. The error based on velocities of V-notched test specimens and pendulum were calculated at several different initial velocities of the pendulum corresponding to different energy levels. The error was also measured by experiment at different energy levels on machine. The results were in reasonable agreement with the calculated values. Various test conditions and material properties of the specimen that cause such error are also discussed.
Collision, coefficient of restitution, velocity, kinetic energy, density
Metallurgist, Thermax Ltd., Pune,
Manager, Thermax Ltd., Pune,