Document Detail

The effect of concrete floor roughness on bovine claws using finite element analysis.
MedLine Citation:
PMID:  18096939     Owner:  NLM     Status:  MEDLINE    
The interaction between bovine claws and a concrete floor with defined roughness and friction coefficients is described using a finite element model. The model was built by using x-ray tomography scanner images of an unloaded fore and hind bovine claw. These images were used to reproduce the geometry of the claw horn capsule, which was used to create a finite element model. Young's moduli of 382, 261, and 13.6 MPa were attributed to the dorsal wall horn, abaxial and axial wall horn, and bulb horn, respectively. Poisson's ratio was set at 0.38. The horn was considered an isotropic elastic material. The model was completed by introducing a rigid support that simulated a concrete floor. The floor was moved to establish contact with the claw and was loaded with a force of 2 or 6 kN. The top border area of the horn capsule was fixed, but angular rotations were allowed. With this model, the effect of varying floor roughness and claw-floor friction on contact pressures and von Mises stresses in the claw horn could be evaluated. This was demonstrated by simulating the contact between the claw models and a smooth and rough floor with a center-line roughness value R(a) of 0 or 0.175 mm, respectively, either without friction or with a static coefficient of friction of 0.75 and a dynamic coefficient of friction of 0.65. Contact pressures ranged from 2.14 to 27.55 MPa. The roughness of the floor was the main determinant in subsequent contact pressures. Maximum von Mises stresses were registered in the claw sole and were mostly between 5.04 and 16.44 MPa, but could be higher in specific situations. The variables claw (fore or hind) and floor (smooth or rough) had significant effects on the contact pressures; in addition, the floor resulted in significantly different von Mises stresses in the claw horn. The variable friction (frictionless or with friction) had a significant effect on the von Mises stresses. The load did not result in significantly different contact pressures and von Mises stresses because of the large increase in contact area with the exerted load.
A Franck; B Verhegghe; N De Belie
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  91     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-12-21     Completed Date:  2008-02-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  182-92     Citation Subset:  IM    
Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering, Ghent University, Gent, Belgium.
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MeSH Terms
Biomechanics / methods
Cattle / anatomy & histology,  physiology*
Construction Materials
Finite Element Analysis
Floors and Floorcoverings*
Forelimb / anatomy & histology,  physiology
Hindlimb / anatomy & histology,  physiology
Hoof and Claw / anatomy & histology,  physiology*
Models, Biological
Tomography, X-Ray Computed / methods

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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