Differences in the mechanical behavior of cortical bone between compression and tension when subjected to progressive loading.
Differences in the mechanical behavior of cortical bone between compression and tension when subjected to progressive loading.
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当受到渐进载荷时，皮质骨在压缩和拉伸之间的机械行为存在差异。
DOI：
10.1016/j.jmbbm.2008.11.008
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发表时间：
2009-12
影响因子：
3.9
通讯作者：
Wang, Xiaodu
中科院分区：
文献类型：
--
作者：
Nyman, Jeffry S.;Leng, Huijie;Dong, X. Neil;Wang, Xiaodu
胶原蛋白和矿物质在骨组织中的层次化排列可能相对于骨中的主要应变模式最大限度地提高了骨折阻力。因此，对于同一解剖部位，皮质骨的能量分散能力可能因压缩和拉伸而不同。为了测试这一概念，我们对人类身体胫骨前象限的骨标本进行了单轴拉伸或单轴压缩的渐进加载方案。取9例中年男性供体胫骨标本，分别采集1个拉力标本(狗骨型)和1个压缩标本(圆柱形)。在加载-停留-卸载-停留-再加载的每个循环中，我们计算了两种加载模式的最大应力、永久应变、弹性模量、应力松弛、时间常数和3条能量耗散路径。在这样做的过程中，我们发现骨骼在压缩时通过永久和粘弹性变形机制比在拉伸时消耗更多的能量。然而，另一方面，骨骼在拉伸状态下通过释放表面能比在压缩状态下消耗更多的能量。此外，屈服后塑性和粘弹性性能的差异并没有反映在模数损失(损伤累积的指标)的演变中，这对两种加载模式都是相似的。一种可能的解释是，两种加载模式下损伤形态的差异可能有利于压缩时塑性和粘弹性的能量耗散，但有利于拉伸时表面能的释放。这种在组织水平上关于骨失效机制的详细信息将有助于解释骨骨折的根本原因。
The hierarchical arrangement of collagen and mineral into bone tissue presumabley maximizes fracture resistance with respect to the predominant strain mode in bone. Thus, the ability of cortical bone to dissipate energy may differ between compression and tension for the same anatomical site. To test this notion, we subjected bone specimens from the anterior quadrant of human cadaveric tibiae to a progressive loading scheme in either uniaxial tension or uniaxial compression. One tension (dog-bone shape) and one compression specimen (cylindrical shape) were collected each from tibiae of nine middle aged male donors. At each cycle of loading-dwell-unloading-dwell-reloading, we calculated maximum stress, permanent strain, modulus, stress relaxation, time constant, and 3 pathways of energy dissipation for both loading modes. In doing so, we found that bone dissipated greater energy through the mechanisms of permanent and viscoelastic deformation in compression than in tension. On the other hand, however, bone dissipated greater energy through the release of surface energy in tension than in compression. Moreover, differences in the plastic and viscoelastic properties after yielding were not reflected in the evolution of modulus loss (an indicator of damage accumulation), which was similar for both loading modes. A possible explanation is that differences in damage morphology between the two loading modes may favor the plastic and viscolelastic energy dissipation in compression, but facilitate the surface energy release in tension. Such detailed information about failure mechanisms of bone at the tissue-level would help explain the underlying causes of bone fractures.
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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：
MARTENS, M
DOI：
10.1115/1.1865188
发表时间：
2005-04-01
影响因子：
1.7
作者：
Cotton, JR;Winwood, K;Taylor, M
通讯作者：
Taylor, M
DOI：
10.1115/1.1933916
发表时间：
2005-08-01
影响因子：
1.7
作者：
Morgan, EF;Lee, JJ;Keaveny, TM
通讯作者：
Keaveny, TM
影响因子：
4.9
作者：
Nyman, Jeffry S.;Roy, Anuradha;Wang, Xiaodu
通讯作者：
Wang, Xiaodu
影响因子：
2.2
作者：
Rho, JY;Kuhn-Spearing, L;Zioupos, P
通讯作者：
Zioupos, P