Systematic error in mechanical measures of damage during four-point bending fatigue of cortical bone
نویسندگان
چکیده
منابع مشابه
Systematic error in mechanical measures of damage during four-point bending fatigue of cortical bone.
Accumulation of fatigue microdamage in cortical bone specimens is commonly measured by a modulus or stiffness degradation after normalizing tissue heterogeneity by the initial modulus or stiffness of each specimen measured during a preloading step. In the first experiment, the initial specimen modulus defined using linear elastic beam theory (LEBT) was shown to be nonlinearly dependent on the p...
متن کاملAge-related Changes in Bending Fatigue of Human Cortical Bone
Age-related non-traumatic fractures are a major health problem. Historically, only bone mass was considered to predict fracture risk but other factors, including accumulation of microdamage, may also affect bone quality and contribute to bone fragility. Previous studies conducted in our laboratory have demonstrated that the predisposition of bone to form linear microcracks and not diffuse damag...
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Experiments and analyses were performed to determine the cause of a nonlinear force-deflection response observed in four-point flexural fatigue of beams of cortical bone machined from the mid-diaphysis of the equine third metacarpus. Observable grooves which formed on the beam surface at supports and load noses were found to be the primary cause of the nonlinearity. An additional geometric nonl...
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Analytical models that predict modulus degradation in cortical bone subjected to uniaxial fatigue loading in tension and compression are presented. On the basis of experimental observations, damage was modeled as self-limiting for tension but not for compression. These mechanistic uniaxial damage models were then developed into a model for flexural fatigue of cortical bone based on laminated be...
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ژورنال
عنوان ژورنال: Journal of Biomechanics
سال: 2009
ISSN: 0021-9290
DOI: 10.1016/j.jbiomech.2009.03.016