Abstract
The restitution characteristics of a fiber racket string in the axial direction are analyzed by considering the viscoelasticity of yams. An impact test apparatus is developed so that one side of the string is fixed on a load cell and the other side is fixed on a hammer. The hammer moves along the slide rail. When it strikes, the impact speed of the hammer is measured with a laser sensor, and the coefficient of restitution is obtained. In the experimental range for all samples, the coefficient of restitution decreases as the impact speed increases. A dynamic restitution model considering the tensile nonlinear viscoelasticity of materials is proposed. Good agree ment is obtained between the experimental and theoretical values. Also, the repulsion of tennis racket strings can be evaluated with the parameters of this model.
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