Title
Elasticity modulus of rabbit middle ear ossicles determined by a novel micro-indentation technique Elasticity modulus of rabbit middle ear ossicles determined by a novel micro-indentation technique
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Human medicine
Source (journal)
Hearing research. - Amsterdam
Volume/pages
263(2010) :1 , p. 33-37
ISSN
0378-5955
ISI
000278583700006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
For the purpose of creating a finite element model of the middle ear, the ossicles can be modelled as rigid bodies or as linear elastic materials. The general elasticity parameters used are usually measured on larger bones like the femur. In order to obtain a highly realistic model, the actual elastic modulus (Youngs modulus) of the ossicles themselves is needed. We developed a novel 2-needle indentation method of determining the Youngs modulus of small samples based on Sneddons solution. We introduce the second needle in such a way that small specimens can be clamped between the two needles and a symmetry plane is obtained, so that geometry-dependent sample deformations are avoided. A finite element calculated correction factor is used to compensate for the small thickness of the samples. The system was tested on several materials with known parameters in order to validate the technique, and was then used to determine the elasticity parameters of incus and malleus in rabbit. No significant differences between measurement locations were found, and we found an average Youngs modulus of View the MathML source.
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