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Effect of Body Flexibility on Impacts Studied on Rods and Beams

[+] Author Affiliations
Robert Seifried

University of California at Berkeley, Berkeley, CA

Paper No. DETC2007-34817, pp. 385-394; 10 pages
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 5: 6th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4806-X | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME


The effect of body flexibility on the impact process is studied through longitudinal impacts on rods and transverse impacts on beams. An experimental setup is presented using Laser-Doppler-Vibrometers in order to measure the displacement and velocity of the colliding bodies during impact. For the numerical investigation, modally-reduced models are used in combination with local Finite Element contact models. Performed on a microscale, these experimental and numerical investigations yield a good understanding of the effect of flexibility influencing the impact, and therefore, the coefficient of restitution. The investigations show that impacts of steel spheres on rods and beams yield strong structural vibrations. In the case of the rod impacts, the coefficient of restitution decreases monotonically with increasing initial velocity. In the case of the beams, the strong bending vibrations which are initiated, cause multiple successive impacts within a very short time period. This results in highly nonlinear behavior and uncertainty for the coefficient of restitution.

Copyright © 2007 by ASME
Topics: Plasticity , Rods



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