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Title: Impact of hard bodies with friction and compliance
Author: Ismail, K. A.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2009
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The importance of tangential compliance and friction has been realised in order to explain phenomenon of slip reversal at the contact point observed during bounce of sports balls. An impact model that accounts for physical behaviour of the bodies during impact is required in order to accurately calculate motion of the bodies during and after impact, especially to explain the former behaviour. The present analysis incorporates effect of friction at the contact surface and tangential compliance for the contact region using lumped parameter model with discrete compliant elements oriented in the directions normal and tangential to the common tangent plane of impact. Our dynamic collision model that is based on the structure of the bodies accounts for energy losses that are consequences of friction, material hysterisis and rate-dependence dissipation. Experimental work is carried out to study the compliance behaviour of a sports ball. The measurements of static compliance are used to model the compliance of the contact region during impact. An improvement on the linear model is discussed with respect to how this affects the evolution of contact forces. Significant parameters that influence response of a body during bounce have been identified.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available