单轴压缩下松质骨的应力率和蠕变性能
发布时间：2018-10-21 10:30
【摘要】：背景:松质骨是一种多孔、非均质、各向异性和具有黏弹性的结构,是骨的重要组成部分。它在负载传输和能量吸收方面起着十分重要的作用。所以对松质骨的力学行为进行研究具有重要意义。目的:探讨单轴压缩实验中应力率对松质骨性能的影响以及不同应力值下松质骨的蠕变行为。方法:以新鲜的猪股骨松质骨为实验材料,施加不同的应力率,至试样的压缩应变达到5%卸载;在松质骨表面施加恒定的应力水平,并保持7 200 s,以便观察其蠕变应变变化。结果与结论:(1)单轴压缩实验中,在同一应变条件下,随着应力率的增加,应力值、杨氏模量也增加;(2)在不同的加载率作用下,松质骨的压缩应力-应变曲线不重合,说明松质骨的压缩力学性能具有率相关性;(3)在蠕变实验中,蠕变应变随着压缩的应力的增加而增加,蠕变柔量随着应力的增加反而减少;(4)轴压缩和蠕变实验结果说明,应力率和恒定应力水平对松质骨的力学性能影响很大,以上结果可以为如何避免松质骨损伤提供参考依据。
[Abstract]:Background: cancellous bone is a porous, heterogeneous, anisotropic and viscoelastic structure, which is an important part of bone. It plays a very important role in load transmission and energy absorption. Therefore, it is of great significance to study the mechanical behavior of cancellous bone. Aim: to investigate the effect of stress rate on the properties of cancellous bone in uniaxial compression test and the creep behavior of cancellous bone under different stress values. Methods: fresh porcine cancellous femur bone was used as experimental material. Different stress rates were applied until the compressive strain of the specimen was 5% unloaded, and a constant stress level was applied on the surface of the cancellous bone, and the creep strain was observed for 7 200 s. Results and conclusions: (1) in uniaxial compression experiments, under the same strain condition, the stress value and Young's modulus also increased with the increase of stress rate, (2) under different loading rates, the compressive stress-strain curve of cancellous bone did not coincide. The results show that the compressive mechanical properties of cancellous bone are rate-dependent. (3) in creep experiment, the creep strain increases with the increase of compressive stress, and the creep compliance decreases with the increase of stress. (4) the results of axial compression and creep test show that, The stress rate and constant stress level have great influence on the mechanical properties of cancellous bone. The above results can provide a reference for how to avoid the damage of cancellous bone.
【作者单位】： 天津理工大学天津市先进机电系统设计与智能控制重点实验室;
【基金】：国家自然科学基金资助项目(11572222) 天津市自然科学基金资助项目(16JCYBJC28400)~~
【分类号】：R318.01;R68
，
本文编号：2284824
[Abstract]:Background: cancellous bone is a porous, heterogeneous, anisotropic and viscoelastic structure, which is an important part of bone. It plays a very important role in load transmission and energy absorption. Therefore, it is of great significance to study the mechanical behavior of cancellous bone. Aim: to investigate the effect of stress rate on the properties of cancellous bone in uniaxial compression test and the creep behavior of cancellous bone under different stress values. Methods: fresh porcine cancellous femur bone was used as experimental material. Different stress rates were applied until the compressive strain of the specimen was 5% unloaded, and a constant stress level was applied on the surface of the cancellous bone, and the creep strain was observed for 7 200 s. Results and conclusions: (1) in uniaxial compression experiments, under the same strain condition, the stress value and Young's modulus also increased with the increase of stress rate, (2) under different loading rates, the compressive stress-strain curve of cancellous bone did not coincide. The results show that the compressive mechanical properties of cancellous bone are rate-dependent. (3) in creep experiment, the creep strain increases with the increase of compressive stress, and the creep compliance decreases with the increase of stress. (4) the results of axial compression and creep test show that, The stress rate and constant stress level have great influence on the mechanical properties of cancellous bone. The above results can provide a reference for how to avoid the damage of cancellous bone.
【作者单位】： 天津理工大学天津市先进机电系统设计与智能控制重点实验室;
【基金】：国家自然科学基金资助项目(11572222) 天津市自然科学基金资助项目(16JCYBJC28400)~~
【分类号】：R318.01;R68
，
本文编号：2284824
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