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Technical Briefs

Anomalous Frictional Behavior in Collisions of Thin Disks Revisited

[+] Author and Article Information
Rahul Mourya1

Mechanical Engineering, Indian Institute of Science, Bangalore 560012, Indiamourya@iitk.ac.in

Anindya Chatterjee

Mechanical Engineering, Indian Institute of Science, Bangalore 560012, Indiaanindya100@gmail.com

1

Present address: Mechanical Engineering, IIT Kanpur, Kanpur, India.

J. Appl. Mech 75(2), 024501 (Feb 25, 2008) (3 pages) doi:10.1115/1.2793131 History: Received May 25, 2006; Revised July 04, 2007; Published February 25, 2008

In prior work, Calsamiglia (1999, “Anomalous Frictional Behavior in Collisions of Thin Disks  ,” ASME J. Appl. Mech., 66, pp. 146–152) reported experimental results of collisions between thin plastic disks and a relatively rigid steel barrier. In those experiments, it was observed that, contrary to a commonly held assumption in rigid body collision modeling, the ratio of tangential to normal components of the contact impulse could be substantially less than the friction coefficient even for collisions where the disk contact point did not reverse its velocity direction (i.e., for sliding collisions). In those experiments, the disk’s edges were rounded to make the contact less sensitive to machining imperfections. While such impact/contact is nominally at a single point, the rounded edges make the interaction three dimensional (from the view point of analyzing deformations). Here, we revisit that problem computationally, but model the edges as flat, making the problem two dimensional. Our finite element calculations (ABAQUS ) do not reproduce the anomalous frictional interactions observed in those experiments, suggesting that rounding of the edges, among other possibilities, may have played a significant role in the experimental results.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 1

Normal restitution coefficient

Grahic Jump Location
Figure 2

Tangential restitution coefficient

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