Deformation of a multi-layered biological structure : digital speckle pattern interferometry on bird beaks
Faculty of Sciences. Physics
OPTICAL MEASUREMENT TECHNIQUES FOR STRUCTURES & SYSTEMS2 (OPTIMESS2012)
5th International Conference on Optical Measurement Techniques for, Structures and Systems2 (OPTIMESS), APR 04-05, 2012, Antwerp, BELGIUM
, p. 369-378
University of Antwerp
A bird beak is a good example of a complex biological multi-layered design. It not only consists of the beak bone, which is built up of a foamy, trabecular inside and a harder, cortical outside, but also a surrounding dermal and epidermal layer. This layer consists of living cells that keratinize going outwards of the beak. Finite element (FE) models are an excellent tool to investigate the influence of geometry and constituent materials on complex biological structures. The modeling of biological samples, however, requires a lot of assumptions. In this paper, the FE outcome is validated with an in situ bending experiment of the Java Finch's beak, with and without a keratin layer. Our custom-made, easy to use digital speckle pattern interferometer (DSPI) enables us to obtain the full-field out-of-plane displacement precisely. These displacements are also used in an inverse analysis so the moduli of bone and keratin can be obtained.