Progressive post-yield behavior of human cortical bone in compression for middle-aged and elderly groups.
Progressive post-yield behavior of human cortical bone in compression for middle-aged and elderly groups.
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DOI：
10.1016/j.jbiomech.2008.11.016
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发表时间：
2009-03-11
影响因子：
2.4
通讯作者：
Wang, Xiaodu
中科院分区：
文献类型：
--
作者：
Leng, Huijie;Dong, X. Neil;Wang, Xiaodu
在本研究中，对骨样本施加渐进加载方案（加载-停留-卸载-停留-重新加载），以检查骨在增加应变水平下的压缩屈服后响应。对两个年龄组（中年组：53±2岁，4女4男，老年组：83±6岁，4女4男）的人胫骨皮质骨标本采用渐进加载方案进行压缩加载。评估了屈服后变形过程中骨的模量退化、塑性变形、粘性响应和能量耗散。虽然两个年龄组之间的初始模量没有显着差异，在老年组中的模量随施加的应变的降解速度比在中年组。骨的模量损失（或微损伤累积）发生在塑性变形之前。中年组和老年组的塑性应变与施加的应变具有相似的线性关系，尽管中年骨在更大的应变下屈服。两组的粘弹性时间常数随应变的增加而变化相似，而在中年组中观察到更高的应力松弛幅度。能量耗散通过三个途径进行了研究：弹性释放应变能，滞回能，塑性应变能。中年组在三条通路上的能量耗散能力均显著高于老年组。所获得的信息可能会提供重要的见解，年龄相关的影响骨脆性。
In this study, a progressive loading regimen (load–dwell–unloading–dwell–reloading) was applied on bone samples to examine the compressive post-yield response of bone at increasing strain levels. Cortical bone specimens from human tibiae of two age groups (middle-aged group: 53±2 years, 4 females and 4 males, elderly group: 83±6 years, 4 females and 4 males) were loaded in compression using the progressive loading scheme. Modulus degradation, plastic deformation, viscous response, and energy dissipation of bone during post-yield deformation were assessed. Although initial modulus was not significantly different between the two age groups, the degradation of modulus with the applied strain in the elderly group was faster than in the middle-aged group. The modulus loss (or microdamage accumulation) of bone occurred prior to plastic deformation. Plastic strain had a similar linear relationship with the applied strain for both middle-aged and the elderly group although middle-aged bone yielded at a greater strain. The viscoelastic time constant changed similarly with increasing strain for the two groups, whereas a higher magnitude of stress relaxation was observed in the middle-aged group. Energy dissipation was investigated through three pathways: elastic release strain energy, hysteresis energy, and plastic strain energy. The middle-aged group had significantly greater capacity of energy dissipation than the elderly group in all three pathways. The information obtained may provide important insights in age-related effects on bone fragility.
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DOI：
10.2106/00004623-197658010-00015
发表时间：
1976-01-01
影响因子：
5.3
作者：
BURSTEIN, AH;REILLY, DT;MARTENS, M
通讯作者：
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影响因子：
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作者：
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