Design and validation of a testing system to assess torsional cancellous bone failure in conjunction with time-lapsed micro-computed tomographic imaging
Design and validation of a testing system to assess torsional cancellous bone failure in conjunction with time-lapsed micro-computed tomographic imaging
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DOI：
10.1016/j.jbiomech.2008.09.014
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发表时间：
2008-12-05
影响因子：
2.4
通讯作者：
Snyder, Brian D.
中科院分区：
文献类型：
--
作者：
Nazarian, Ara;Bauernschmitt, Michael;Snyder, Brian D.
当轴向压缩时，松质骨通常会沿着明确的带以倾斜角度失效，这凸显了松质骨剪切特性的重要性。确定松质骨剪切特性的扭转测试通常在仅适合由均质和各向同性材料组成的轴对称样本的条件下进行。然而，大多数松质骨标本不满足这些严格的测试条件。因此，本研究的目的是设计和验证用于非均匀正交各向异性或非轴对称样本的单轴增量扭转测试系统。通过使用有机玻璃棒和梁来验证新设计的扭转系统的精度和准确性，其中将获得的材料性能与制造商提供的材料性能进行比较。此外，使用鲸鱼松质骨标本验证了系统的增量逐步应用角位移和同时延时 mu CT 成像能力，逐步应用角位移产生与传统扭转研究中连续应用角位移相似的扭转机械性能。 总之，设计并验证了一种采用增量逐步应用扭转和同时延时 mu CT 成像的非均质正交各向异性材料的新型扭转测试系统。 (C) 2008 Elsevier Ltd. 保留所有权利。
When compressed axially, cancellous bone often fails at an oblique angle along well-defined bands, highlighting the importance of cancellous bone shear properties. Torsion testing to determine shear properties of cancellous bone has often been conducted under conditions appropriate only for axis-symmetric specimens comprised of homogeneous and isotropic materials. However, most cancellous bone specimens do not meet these Stringent test conditions. Therefore, the aim of this study was to design and validate a uniaxial, incremental torsional testing system for non-homogeneous orthotropic or non-axis-symmetric specimens.Precision and accuracy of the newly designed torsion system was validated by using Plexiglas rods and beams, where obtained material Properties were compared to those Supplied by the manufacturer. Additionally, the incremental step-wise application Of angular displacement and simultaneous time-lapsed mu CT imaging capability of the system was validated using whale cancellous bone specimens, with step-wise application of angular displacement yielding similar torsional mechanical properties to continuous application of angular displacement in a conventional torsion study.In conclusion, a novel torsion testing system for non-homogeneous, orthotropic materials using the incremental step-wise application Of torsion and simultaneous time-lapsed mu CT imaging was designed and validated. (C) 2008 Elsevier Ltd. All rights reserved.