Nonlinear elastic-viscoplastic constitutive equations for aging facial tissues (original) (raw)

Abstract

This paper reports on the initial stages of a project to simulate the nonlinear mechanical behavior of an aging human face. A cross-section of the facial structure is considered to consist of a multilayered composite of tissues with differing mechanical behavior. The constitutive properties of these tissues are incorporated into a finite element model of the three-dimensional facial geometry. Relatively short time (elastic-viscoplastic) behavior is governed by equations previously developed which are consistent with mechanical tests. The long time response is controlled by the aging elastic components of the tissues. An aging function is introduced which, in a simplified manner, captures the observed loss of stiffness of these aging elastic components due to the history of straining as well as other physiological and environmental influences. Calculations have been performed for 30 years of exposure to gravitational forces. Progressive gravimetric soft tissue descent is simulated, which is regarded as the main indication of facial aging. Results are presented for the deformations and stress distributions in the layers of the soft tissues.

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Acknowledgements

The authors thank Dr. Matthias Teschner of the Computer Graphics Laboratory of ETH Zurich for providing the triangulated face surface and for his precious advice on the creation of the three-dimensional element mesh. Also, the work of M.B. Rubin was partially supported by the fund for promotion of research at the Technion. In addition, the authors wish to thank the reviewers for their constructive comments.

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Authors and Affiliations

1. Institute of Mechanical Systems ETH, 8092, Zurich, Switzerland
   E. Mazza & O. Papes
2. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 32000, Haifa, Israel
   M. B. Rubin & S. R. Bodner
3. The Cosmetic Surgery Center of SE Texas Port Arthur, Texas, 77642, USA
   N. S. Binur

Authors

1. E. Mazza
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2. O. Papes
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3. M. B. Rubin
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4. S. R. Bodner
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5. N. S. Binur
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Correspondence toE. Mazza.

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Mazza, E., Papes, O., Rubin, M.B. et al. Nonlinear elastic-viscoplastic constitutive equations for aging facial tissues.Biomech Model Mechanobiol 4, 178–189 (2005). https://doi.org/10.1007/s10237-005-0074-y

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• Received: 17 November 2004
• Accepted: 19 April 2005
• Published: 12 August 2005
• Issue Date: November 2005
• DOI: https://doi.org/10.1007/s10237-005-0074-y

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