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Happy and Unhappy Balls

Blanket design and Performance

Rubber Composites

Happy and Unhappy Balls

Spring versus Dashpot

Happy and Unhappy Balls;
more flexible elastomers have higher hysteresis losses.

Happy and Unhappy balls

The Happy Ball, with a springlike behaviour, has a hardness Shore A = 67º.
The highly damped Unhappy Ball has a hardness Shore A = 31º.