The destructive experiment is to deform the racket until it fails, and then test the final external force.
The top impact test is a dynamic test on the top area. During the experiment, the racket will be dropped from a height. Gradually increase the height until the racket is destroyed. The fall height of the racket damage is used to express the impact strength of the top of the racket.
Athletes throw their rackets on the ground when they are discouraged. Or the tendency of the net often causes malfunctions at 3 o’clock and 9 o’clock on the face of the racket. This forced manufacturers to design experiments under these conditions. Place the racket in a circular frame similar to a pendulum and rotate it around the handle. Fall from a horizontal position and collide with a solid vertical circle. The mass can be loaded on the racket like the top impact experiment. Increase the quality until the racket breaks.
The racket also needs to have a certain temperature resistance. Therefore, there is a temperature experiment to test its temperature resistance. Arrange the rackets in a row and place them at 80°C for about 4 hours. Then test its defects.
Estimate the grommet strength experiment. Pass a network cable through the two grommet holes. Continue pulling both ends of the wire inside the frame until the grommet or frame cannot withstand the shear stress. The strength of the grommet is indicated by the measured maximum pressure that caused the failure.
