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The effect of cyclic loading on the stiffness and damping factors in the midsoles of running shoes

Walker, C.A. (2006) The effect of cyclic loading on the stiffness and damping factors in the midsoles of running shoes. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 220 (1). pp. 41-47. ISSN 1464-4207

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Abstract

A method has been developed for deriving the damping parameters (logarithmic decrement and damping factor) from an analysis of the complete load deformation curve, both for a single cycle and after several thousand load cycles. The stiffness and damping properties of five types of running shoes have been measured under low frequency loading, and also at 1 Hz - close to the frequency of heelstrike. It was found that although the damping factors range from 0.02 to 0.04 at low frequency, they are reduced to a range between 0.013 and 0.03 when the load is cycled at 1 Hz. In a similar fashion, the stiffness values increased under cyclic loading, so that the energy absorbed by the midsole was reduced by about a factor of two. These findings were found to be repeated across all the types of shoes that were tested, and related to the basic deformation mechanisms in the polymers used in the midsoles.

Item type: Article
ID code: 6340
Keywords: running shoe, dampling, elastomer, sports engineering, running, Mechanical engineering and machinery, Sports Medicine, Engineering design
Subjects: Technology > Mechanical engineering and machinery
Medicine > Internal medicine > Sports Medicine
Technology > Engineering (General). Civil engineering (General) > Engineering design
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 17 Jul 2008
    Last modified: 12 Mar 2012 10:44
    URI: http://strathprints.strath.ac.uk/id/eprint/6340

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