A structural constitutive model for the human lens capsule |
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Authors: | Harvey John Burd |
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Institution: | (1) Department of Engineering Science, Oxford University, Oxford, OX1 3PJ, UK |
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Abstract: | Published data on the mechanical performance of the human lens capsule when tested under uniaxial and biaxial conditions are
reviewed. It is concluded that two simple phenomenological constitutive models (namely a linear elastic model and a Fung-type
hyperelastic model) are unable to provide satisfactory representations of the mechanical behaviour of the capsule for both
of these loading conditions. The possibility of resolving these difficulties using a structural constitutive model for the
capsule, of a form that is inspired by the network of collagen IV filaments that exist within the lens capsule, is explored.
The model is implemented within a rectangular periodic cell. Prescribed stretches are imposed on the periodic cell and the
network is allowed to deform in a non-affine manner. The performance of the constitutive model correlates well with previously
published test data. One possible application of the model is in the development of a multi-scale analysis of the mechanics
of the human lens capsule. |
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Keywords: | Lens capsule Collagen Structural constitutive model Multi-scale |
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