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    Sensitivity of Multiple Damage Parameters to Compressive Overload in Cortical Bone

    Source: Journal of Biomechanical Engineering:;2005:;volume( 127 ):;issue: 004::page 557
    Author:
    Elise F. Morgan
    ,
    Tony M. Keaveny
    ,
    John J. Lee
    DOI: 10.1115/1.1933916
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Damage accumulation plays a key role in weakening bones prior to complete fracture and in stimulating bone remodeling. The goal of this study was to characterize the degradation in the mechanical properties of cortical bone following a compressive overload. Longitudinally oriented, low-aspect ratio specimens (n=24) of bovine cortical bone were mechanically tested using an overload-hold-reload protocol. No modulus reductions greater than 5% were observed following overload magnitudes less than 0.73% strain. For each specimen, changes in strength and Poisson’s ratio were greater (p=0.02) than that in modulus by 10.8- and 26.6-fold, respectively, indicating that, for the specimen configuration used in this study, longitudinal elastic modulus is one of the least sensitive properties to a compressive overload. Residual strains were also proportionately greater by 6.4-fold (p=0.01) in the transverse than axial direction. These results suggest that efforts to relate microcrack density and morphology to changes in compressive mechanical properties of cortical bone may benefit from considering alternative parameters to modulus reductions.
    keyword(s): Stress , Poisson ratio , Mechanical properties , Bone , Fracture (Process) , Elastic moduli AND Microcracks ,
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      Sensitivity of Multiple Damage Parameters to Compressive Overload in Cortical Bone

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    http://yetl.yabesh.ir/yetl1/handle/yetl/131351
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    contributor authorElise F. Morgan
    contributor authorTony M. Keaveny
    contributor authorJohn J. Lee
    date accessioned2017-05-09T00:15:18Z
    date available2017-05-09T00:15:18Z
    date copyrightAugust, 2005
    date issued2005
    identifier issn0148-0731
    identifier otherJBENDY-26519#557_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/131351
    description abstractDamage accumulation plays a key role in weakening bones prior to complete fracture and in stimulating bone remodeling. The goal of this study was to characterize the degradation in the mechanical properties of cortical bone following a compressive overload. Longitudinally oriented, low-aspect ratio specimens (n=24) of bovine cortical bone were mechanically tested using an overload-hold-reload protocol. No modulus reductions greater than 5% were observed following overload magnitudes less than 0.73% strain. For each specimen, changes in strength and Poisson’s ratio were greater (p=0.02) than that in modulus by 10.8- and 26.6-fold, respectively, indicating that, for the specimen configuration used in this study, longitudinal elastic modulus is one of the least sensitive properties to a compressive overload. Residual strains were also proportionately greater by 6.4-fold (p=0.01) in the transverse than axial direction. These results suggest that efforts to relate microcrack density and morphology to changes in compressive mechanical properties of cortical bone may benefit from considering alternative parameters to modulus reductions.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSensitivity of Multiple Damage Parameters to Compressive Overload in Cortical Bone
    typeJournal Paper
    journal volume127
    journal issue4
    journal titleJournal of Biomechanical Engineering
    identifier doi10.1115/1.1933916
    journal fristpage557
    journal lastpage562
    identifier eissn1528-8951
    keywordsStress
    keywordsPoisson ratio
    keywordsMechanical properties
    keywordsBone
    keywordsFracture (Process)
    keywordsElastic moduli AND Microcracks
    treeJournal of Biomechanical Engineering:;2005:;volume( 127 ):;issue: 004
    contenttypeFulltext
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