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Proceedings Paper

Machine-augmented composites displaying control of unusual spin for a bouncing ball
Author(s): G. F. Hawkins; M. J. O'Brien; C.-Y. Tang
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Paper Abstract

One unique property of a Machine Augmented Composite (MAC) is its ability to convert a compressive force into a shear force, and vice versa, simply by the geometry of its angled sidewalls. We have discovered that a non-spinning ball dropped at a normal angle onto the MAC’s surface rebounds from that surface at an angle different from the normal and develops a significant rotational velocity. The MAC can be designed so that the spin imparted on the ball is either clockwise or counterclockwise and tailored so that the ball’s oblique angle rebound is either positive or negative from its normal angle. Through finite-element analyses and experiments, the magnitude and direction of the spin can be precisely controlled by tailoring the stiffness of the MAC through the properties and dimensions of its constituent materials.

Paper Details

Date Published: 16 February 2004
PDF: 9 pages
Proc. SPIE 5648, Smart Materials III, (16 February 2004); doi: 10.1117/12.584206
Show Author Affiliations
G. F. Hawkins, The Aerospace Corp. (United States)
M. J. O'Brien, The Aerospace Corp. (United States)
C.-Y. Tang, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 5648:
Smart Materials III
Alan R. Wilson, Editor(s)

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