Analytical mechanics is used to derive original 3D equations of motion that represent impact at a point in a system of rigid bodies. For oblique impact between rough bodies in an eccentric (unbalanced) configuration, these equations are used to compare the calculations of energy dissipation obtained using either the kinematic, the kinetic, or the energetic coefficient of restitution (COR); , or . Examples demonstrate that for equal energy dissipation by nonfrictional sources, either or depending on whether the unbalance of the impact configuration is positive or negative relative to the initial direction of slip. Consequently, when friction brings initial slip to rest during the contact period, calculations that show energy gains from impact can result from either the kinematic or the kinetic COR. On the other hand, the energetic COR always correctly accounts for energy dissipation due to both hysteresis of the normal contact force and friction, i.e., it is energetically consistent.
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August 2015
Research-Article
Energetically Consistent Calculations for Oblique Impact in Unbalanced Systems With Friction
W. J. Stronge
W. J. Stronge
Department of Engineering,
University of Cambridge
,Cambridge CB2 1PZ
, UK
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W. J. Stronge
Department of Engineering,
University of Cambridge
,Cambridge CB2 1PZ
, UK
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received February 24, 2015; final manuscript received April 25, 2015; published online June 9, 2015. Editor: Yonggang Huang.
J. Appl. Mech. Aug 2015, 82(8): 081003 (12 pages)
Published Online: August 1, 2015
Article history
Received:
February 24, 2015
Revision Received:
April 25, 2015
Online:
June 9, 2015
Citation
Stronge, W. J. (August 1, 2015). "Energetically Consistent Calculations for Oblique Impact in Unbalanced Systems With Friction." ASME. J. Appl. Mech. August 2015; 82(8): 081003. https://doi.org/10.1115/1.4030459
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