Extended Finite Element models of introcortical porosity and heterogeneity in cortical bone.
Extended Finite Element models of introcortical porosity and heterogeneity in cortical bone.
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DOI：
10.1016/j.commatsci.2012.04.018
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发表时间：
2012-11
影响因子：
3.3
通讯作者：
Vashishth D
中科院分区：
文献类型：
--
作者：
Besdo S;Vashishth D
由于老化过程中骨质的变化，骨折风险增加。影响骨质的不同参数的影响还不清楚。有限元法提供了通过改变单个参数来确定参数的单独贡献的机会。在这项研究中，ABAQUS扩展有限元法（xFEM）被应用于模拟裂纹在密质骨样本的扩展使用二次名义应力作为裂纹准则。使用从19岁和81岁供体加工的紧凑拉伸样品的微型计算机断层扫描图像，通过Mimics生成由线性四面体组成的有限元网格。仅在估计的裂纹区域中对空腔进行建模，以避免大量的自由度。裂纹区域用更多的小单元进行网格划分。其他区域由少量较大的元素组成。在这些分区中，通过使用有效材料参数，考虑了由于模型简化而引起的材料常数的变化。我们的研究结果表明，与年龄相关的骨韧性损失的结果增加孔隙度和损失的异质性材料水平的属性。
Due to changes in the bone quality during ageing the fracture risk increases. The influence of the different parameters affecting bone quality is not well understood. The Finite Element method offers the opportunity to determine the individual contribution of a parameter by changing single parameters. In this study, the ABAQUS extended Finite Elements Method (xFEM) was applied to simulate the crack propagation in compact bone samples using the quadratic nominal stress as crack criterion. Micro computed tomography images of compact-tension samples machined from a 19 and an 81 years old donor were used to generate Finite Element meshes consisting of linear tetrahedrons via Mimics. Cavities were modelled only in the estimated crack area to avoid a high number of degrees of freedom. Crack area was meshed with a higher number of smaller elements. The other areas were meshed with a small number of larger elements. The changes in the material constants due to the simplification of the model were taken into account by using effective material parameters in these partitions. Our results show that age-related loss in bone toughness results from increased porosity and loss in heterogeneity of material level properties.
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DOI：
10.1115/1.2768377
发表时间：
2007-10-01
影响因子：
1.7
作者：
Ural, Ani;Vashishth, Deepak
通讯作者：
Vashishth, Deepak
影响因子：
41.2
作者：
Peterlik, H;Roschger, P;Fratzl, P
通讯作者：
Fratzl, P
影响因子：
2.8
作者：
O'Brien, FJ;Taylor, D;Lee, TC
通讯作者：
Lee, TC
影响因子：
4
作者：
Chen, H.;Zhou, X.;Bunai, Y.
通讯作者：
Bunai, Y.
影响因子：
4.1
作者：
Wang, XD;Masilamani, NS;Agrawal, CM
通讯作者：
Agrawal, CM