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Assessment of the non-linear behaviour of plastic ankle foot orthoses by the finite element method

Assessment of the non-linear behaviour of plastic ankle foot orthoses by the finite element method
Assessment of the non-linear behaviour of plastic ankle foot orthoses by the finite element method
The stiffness characteristics of plastic ankle foot orthoses (AFOs) are studied through finite element modelling and stress analysis. Particular attention is given to the modelling and prediction of non-linear AFO behaviour, which has been frequently observed in previous experimental studies but not fully addressed analytically. Both large deformation effects and material non-linearity are included in the formulation and their individual influence on results assessed. The finite element program is subsequently applied to the simulation of a series of tests designed to investigate the relation between AFO trimline location and stiffness for moderate and large rotations. Through careful consideration and identification of key modelling parameters, the developed finite element solution proves to be a reliable and effective alternative means of assessing variations of a typical plastic AFO design so that particular patient requirements could be met, in the long term
ankle foot orthosis, orthosis stiffness, orthosis trimline, plantar flexion, dorsiflexion, polypropylene, non-linearity, finite elements
0954-4119
527-539
Syngellakis, S.
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88
Arnold, M. A.
718651ef-e471-4286-a184-6c582704bbf4
Rassoulian, H.
fb790ce9-8f8f-43be-ba2e-9fbd7d8d64e0
Syngellakis, S.
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88
Arnold, M. A.
718651ef-e471-4286-a184-6c582704bbf4
Rassoulian, H.
fb790ce9-8f8f-43be-ba2e-9fbd7d8d64e0

Syngellakis, S., Arnold, M. A. and Rassoulian, H. (2000) Assessment of the non-linear behaviour of plastic ankle foot orthoses by the finite element method. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 214 (5), 527-539. (doi:10.1243/0954411001535561).

Record type: Article

Abstract

The stiffness characteristics of plastic ankle foot orthoses (AFOs) are studied through finite element modelling and stress analysis. Particular attention is given to the modelling and prediction of non-linear AFO behaviour, which has been frequently observed in previous experimental studies but not fully addressed analytically. Both large deformation effects and material non-linearity are included in the formulation and their individual influence on results assessed. The finite element program is subsequently applied to the simulation of a series of tests designed to investigate the relation between AFO trimline location and stiffness for moderate and large rotations. Through careful consideration and identification of key modelling parameters, the developed finite element solution proves to be a reliable and effective alternative means of assessing variations of a typical plastic AFO design so that particular patient requirements could be met, in the long term

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Published date: 2000
Keywords: ankle foot orthosis, orthosis stiffness, orthosis trimline, plantar flexion, dorsiflexion, polypropylene, non-linearity, finite elements

Identifiers

Local EPrints ID: 21425
URI: http://eprints.soton.ac.uk/id/eprint/21425
ISSN: 0954-4119
PURE UUID: eb9d5b58-7714-4f97-85da-60f0deb98c6b

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Date deposited: 08 Feb 2007
Last modified: 15 Mar 2024 06:30

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Contributors

Author: S. Syngellakis
Author: M. A. Arnold
Author: H. Rassoulian

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