COSSERAT MICROMECHANICS OF HUMAN-BONE - STRAIN REDISTRIBUTION BY A HYDRATION SENSITIVE CONSTITUENT
COSSERAT MICROMECHANICS OF HUMAN-BONE - STRAIN REDISTRIBUTION BY A HYDRATION SENSITIVE CONSTITUENT
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DOI：
10.1016/0021-9290(86)90015-1
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发表时间：
1986-01-01
影响因子：
2.4
通讯作者：
LAKES, RS
中科院分区：
文献类型：
--
作者：
PARK, HC;LAKES, RS
对人密质骨棱柱状正方形横截面扭转应变分布的实验测定揭示了与微观结构有关的非经典效应。具体地说，在小应变的湿骨中，观察到与经典预测的应变分布显著偏离。湿骨中测量的应变分布遵循基于Cosserat(微极)弹性的预测。在干骨中，应变分布与经典弹性理论的预测非常接近。哈弗斯骨粒与骨水泥之间的相互作用被认为是产生这种现象的主要机制。为了验证这一假设，更多的试件受到长期的扭转载荷，并通过反射光学显微镜观察水泥线。在骨水泥线上观察到局部变形，但比早先报道的牛丛状骨的变形要小。
Experimental determination of the strain distribution in prismatic, square cross-section bars of human compact bone in torsion disclosed nonclassical effects associated with the microstructure. Specifically, in wet bone at small strain, significant deviations from the classically predicted strain distribution were observed. The measured strain distribution in wet bone followed predictions based on Cosserat (micropolar) elasticity. In dry bone, the strain distribution was very close to the prediction of classical elasticity. The interaction between Haversian osteons and the cement substance between them was hypothesized to be the principal mechanism for the phenomena. To evaluate this hypothesis, additional specimens were subjected to prolonged torsional load and the cement lines were observed by reflected light microscopy. Localized deformation at the cement lines was observed, but it was less than values reported earlier for bovine plexiform bone.