1. First of all, what is pendulum impact? 

Classification of energy release impact: pendulum impact is divided into cantilever beam impact testing machine and simply supported beam impact testing machine according to different impact modes and different spline clamping modes. 

2. Cantilever beam impact machine, simply supported beam impact machine definition:

IZOD: test device for clamping one end of a spline and receiving the energy released by a pendulum at the other end so that it is damaged by a blow

Simply supported beam (CHARPPY) : a test device in which both ends of the sample are placed on the specified position of the simply supported beam impact machine, and then the sample is subjected to impact bending load from the middle by using the pendulum to make the sample break.