Dynamic properties of cortical bone tissue: izod tests and numerical study
Dynamic properties of cortical bone tissue: izod tests and numerical study
复制标题
皮质骨组织的动态特性：悬臂梁试验和数值研究
DOI：
10.3970/cmc.2010.019.217
复制
发表时间：
2010
影响因子：
3.1
通讯作者：
V. Silberschmidt
中科院分区：
文献类型：
--
作者：
A. Abdel;A. Maligno;V. Silberschmidt
骨骼是骨骼的主要结构成分：它帮助一个活着的身体承重框架。该组件的结构完整性很重要；了解其失效前的力学行为对于预防和诊断创伤是必要的。在诸如创伤性跌倒、车祸和运动损伤等动态事件中，骨骼可能暴露在超过其结构强度和/或断裂韧性的载荷下。通过开发足够的数值模型来预测和描述其变形和断裂行为直至骨折，可以对骨折的原因和预防或治疗方法进行详细的研究。本研究涉及皮质骨组织及其对动力载荷的响应的实验分析和数值模拟。涉及两个领域：用于量化骨骼在冲击载荷下行为的冲击试验，以及模拟这些试验的二维有限元模型。在第一部分中，研究了皮质位置、缺口深度和能量水平三种不同参数对骨组织对动态载荷反应的影响。从前、后、内、外侧皮层位置切割的标本在两种不同的能量水平下对两个切口深度进行了测试。第二部分，利用Abaqus/Explicit有限元软件建立了冲击Izod试验的二维数值模型。一个完全瞬态的公式采用了锤的初始角速度以及试样和冲击锤的实际尺寸和材料特性。采用线弹性、弹塑性和粘弹性三种不同的本构材料模型，比较各自的冲击参数和断裂力结果。得到的实验结果强调了牛股骨皮质骨在皮质位置上具有几乎一致的骨折能特征。仿真结果表明，粘弹性模型与实验数据吻合较好。
Bone is the principal structural component of a skeleton: it assists the load-bearing framework of a living body. Structural integrity of this component is important; understanding of its mechanical behaviour up to failure is necessary for prevention and diagnostic of trauma. In dynamic events such as traumatic falls, involvement in car crash and sports injuries, bone can be exposed to loads exceeding its structural strength and/or fracture toughness. By developing adequate numerical models to predict and describe its deformation and fracture behaviour up to fracture, a detailed study of reasons for, and ways to prevent or treatment methods of, bone fracture could be implemented. This study deals with both experimental analysis and numerical simulations of a cortical bone tissue and its response to dynamic loading. Two areas are covered: impact Izod tests for quantifying a bone’s behaviour under impact loading, and a 2-D finite-element model simulating these tests. In the first part the effect of three different parameters a cortex position, a notch depth and an energy level – on the bones tissue’s response to dynamic loading was investigated. Specimens cut from anterior, posterior, medial and lateral cortex position were tested at two different levels of energy for two notch depths. In the second part, a 2D numerical model for the impact Izod test was developed using the Abaqus/Explicit finite-element software. A fully transient formulation employs an initial angular velocity of the hammer together with the real dimensions and material properties of the specimen and the impacting hammer. Three different constitutive material models linear-elastic, elastic-plastic and viscoelastic were implemented to compare respective results for impact parameters and fracture force. The obtained experimental results emphasize that bovine femur cortical bone has a nearly uniform fracture energy character with regard to cortex position. The simulation results showed a good agreement of the viscoelastic model with the experimental data.
DOI：
10.1016/j.jmbbm.2010.10.001
发表时间：
2011-07-01
影响因子：
3.9
作者：
Abdel-Wahab, Adel A.;Alam, Khurshid;Silberschmidt, Vadim V.
通讯作者：
Silberschmidt, Vadim V.