Type

Journal Article

Authors

Michael D. Gilchrist
Michel Destrade
Aisling Ní Annaidh
Karine Bruyère

Subjects

Engineering

Topics
orientation skin tissues biaxial tests human skin mechanical properties experimental data image processing finite element fe anisotropic collagen fibres fibre orientation

Automated estimation of collagen fibre dispersion in the dermis and its contribution to the anisotropic behaviour of skin (2012)

Abstract Collagen fibres play an important role in the mechanical behaviour of many soft tissues. Modelling of such tissues now often incorporates a collagen fibre distribution. However, the availability of accurate structural data has so far lagged behind the progress of anisotropic constitutive modelling. Here, an automated process is developed to identify the orientation of collagen fibres using inexpensive and relatively simple techniques. The method uses established histological techniques and an algorithm implemented in the MATLAB image processing toolbox. It takes an average of 15 s to evaluate one image, compared to several hours if assessed visually. The technique was applied to histological sections of human skin with different Langer line orientations and a definite correlation between the orientation of Langer lines and the preferred orientation of collagen fibres in the dermis was observed. The structural parameters of the Gasser-Ogden-Holzapfel (GOH) model were all successfully evaluated. The mean dispersion factor for the dermis was The constitutive parameters mu, k (1) and k (2) were evaluated through physically-based, least squares curve-fitting of experimental test data. The values found for mu, k (1) and k (2) were 0.2014 MPa, 243.6 and 0.1327, respectively. Finally, the above model was implemented in ABAQUS/Standard and a finite element (FE) computation was performed of uniaxial extension tests on human skin. It is expected that the results of this study will assist those wishing to model skin, and that the algorithm described will be of benefit to those who wish to evaluate the collagen dispersion of other soft tissues.
Collections Ireland -> National University of Ireland Galway -> Mathematics
Ireland -> National University of Ireland Galway -> School of Mathematics, Statistics and Applied Mathematics
Ireland -> University College Dublin -> Mechanical & Materials Engineering Research Collection
Ireland -> National University of Ireland Galway -> Mathematics (Scholarly Articles)
Ireland -> National University of Ireland Galway -> College of Science
Ireland -> University College Dublin -> College of Engineering & Architecture
Ireland -> University College Dublin -> School of Mechanical and Materials Engineering

Full list of authors on original publication

Michael D. Gilchrist, Michel Destrade, Aisling Ní Annaidh, Karine Bruyère

Experts in our system

1
M. D. Gilchrist
University College Dublin
Total Publications: 172
 
2
Michel Destrade
National University of Ireland Galway
Total Publications: 106
 
3
Aisling Ní Annaidh
University College Dublin
Total Publications: 17