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The response of equine cortical bone to loading at strain rates experienced in vivo by the galloping horse
Author(s) -
EVANS G. P.,
BEHIRI J. C.,
VAUGHAN L. C.,
BONFIELD W.
Publication year - 1992
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.1111/j.2042-3306.1992.tb02796.x
Subject(s) - strain (injury) , strain rate , brittleness , horse , materials science , deformation (meteorology) , cortical bone , composite material , medicine , anatomy , biology , paleontology
Summary The behaviour of cortical bone under load is strain rate‐dependent, i.e. it is dependent on the rate at which the load is applied. This is particularly relevant in the galloping horse since the strain rates experienced by the bone are far in excess of those recorded for any other species. In this study the effect of strain rates between 0.0001 and 1 sec‐ 1 on the mechanical properties of equine cortical bone were assessed. Initially, increasing strain rates resulted in increased mechanical properties. Beyond a critical value, however, further increases in strain rate resulted in lower strain to failure and energy absorbing capacity. This critical rate occurred around 0.1 sec −1 which is within the in vivo range for a galloping racehorse. Analysis of the stress‐strain curves revealed a transition in the type of deformation at this point from pseudo‐ductile to brittle. Bones undergoing brittle deformation are more likely to fail under load, leading to catastrophic fracture and destruction of the animal.