Staffordshire University logo
STORE - Staffordshire Online Repository

A mathematical method for quantifying in vivo mechanical behaviour of heel pad under dynamic load.

NAEMI, Roozbeh and CHATZISTERGOS, Panagiotis and CHOCKALINGAM, Nachiappan (2015) A mathematical method for quantifying in vivo mechanical behaviour of heel pad under dynamic load. Medical and Biological Engineering and Computing, 54 (2-3). pp. 341-350. ISSN 1741-0444

[img] Text
2434.pdf - Publisher's typeset copy
Restricted to Repository staff only
Available under License Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Download (1MB) | Request a copy

Abstract or description

Mechanical behaviour of the heel pad, as a shock attenuating interface during a foot strike, determines the loading on the musculoskeletal system during walking. The mathematical models that describe the force deformation relationship of the heel pad structure can determine the mechanical behaviour of heel pad under load. Hence, the purpose of this study was to propose a method of quantifying the heel pad stress-strain relationship using force-deformation data from an indentation test. The energy input and energy returned densities were calculated by numerically integrating the area below the stress-strain curve during loading and unloading, respectively. Elastic energy and energy absorbed densities were calculated as the sum of and the difference between energy input and energy returned densities, respectively. By fitting the energy function, derived from a nonlinear viscoelastic model, to the energy density-strain data, the elastic and viscous model parameters were quantified. The viscous and elastic exponent model parameters were significantly correlated with maximum strain, indicating the need to perform indentation tests at realistic maximum strains relevant to walking. The proposed method showed to be able to differentiate between the elastic and viscous components of the heel pad response to loading and to allow quantifying the corresponding stress-strain model parameters.

Item Type: Article
Faculty: Previous Faculty of Health Sciences > Psychology, Sport and Exercise
Depositing User: Nachiappan CHOCKALINGAM
Date Deposited: 21 Sep 2016 11:39
Last Modified: 12 Jan 2017 17:33
URI: http://eprints.staffs.ac.uk/id/eprint/2434

Actions (login required)

View Item View Item

DisabledGo Staffordshire University is a recognised   Investor in People. Sustain Staffs
Legal | Freedom of Information | Site Map | Job Vacancies
Staffordshire University, College Road, Stoke-on-Trent, Staffordshire ST4 2DE t: +44 (0)1782 294000