Bouncing gel balls: impact of soft gels onto rigid surface

Details Bouncing gel balls: impact of soft gels onto rigid surface Bouncing gel balls: impact of soft gels onto rigid surface

2003-02-09

arxiv.org/abs/cond-mat/0302167v2

Physics

Condensed Matter

7 pages, 4 figures (minor revisions, To appear in Europhys. Lett.)

Scientific paper

10.1209/epl/i2003-00462-x

After thrown onto a solid substrate, very soft spherical gels bounce repeatedly. Separate rheological measurements suggest that these balls can be treated as nearly elastic. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, the gel ball deformed into flattened forms like a pancake. We measured the size of the gel balls at the maximal deformation and the contact time as a function of velocities for the samples different in the original spherical radius and the Young modulus. The experimental results revealed a number of scaling relations. To interpret these relations, we developed scaling arguments to propose a physical picture.

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