中国组织工程研究 ›› 2017, Vol. 21 ›› Issue (31): 5014-5018.doi: 10.3969/j.issn.2095-4344.2017.31.016

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

单轴压缩下松质骨的应力率和蠕变性能

魏朝磊,高丽兰,张春秋,刘东东,江汪彪   

  1. 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,天津市 300384
  • 出版日期:2017-11-08 发布日期:2017-12-01
  • 通讯作者: 高丽兰,博士,副教授,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,机电工程国家级实验教学示范中心,天津市 300384
  • 作者简介:魏朝磊,男,1990年生,湖南省隆回县人,汉族,2017年天津理工大学毕业,硕士,主要从事生物力学研究。
  • 基金资助:

    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)

Stress rate and creep behaviors of cancellous bone under uniaxial compression

Wei Chao-lei, Gao Li-lan, Zhang Chun-qiu, Liu Dong-dong, Jiang Wang-biao   

  1. Tianjin University of Technology, Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, Tianjin 300384, China
  • Online:2017-11-08 Published:2017-12-01
  • Contact: Gao Li-lan, M.D., Associate professor, Tianjin University of Technology, Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, National Demonstration Center of Experimental Mechanical and Electrical Engineering Eduction, Tianjin 300384, China
  • About author:Wei Chao-lei, Master, Tianjin University of Technology, Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, Tianjin 300384, China
  • Supported by:

    the National Natural Science Foundation of China, No. 11572222; the Natural Science Foundation of Tianjin, No. 16JCYBJC28400

摘要:

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文题释义:
骨力学:是生物力学的重要分支, 研究骨组织在外力作用下的力学特性和骨受力后的生物效应, 是对骨质进行评定的一种可靠方法。骨的力学研究不仅能对骨科疾病、骨伤治疗、代用材料和康复学等领域有着重要的临床应用价值,而且对于力学学科的发展、生物医学工程以及新材料的研究也有重要的启示作用。
蠕变:蠕变实验方法有很多种类。如通过对材料试件施加恒定的拉力,以研究材料拉伸蠕变性能的拉伸法;利用扭转流变仪,对材料试件施加恒定扭力,以研究材料的扭转蠕变性能的扭转法等。同时,有大量的研究证明骨的蠕变是一种复杂现象,会随加载方式和局部的力学性能而变化。
 
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。

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程
ORCID: 0000-0002-7288-6686(高丽兰)

关键词: 骨科植入物, 骨植入物, 松质骨, 单轴压缩, 率相关, 蠕变, 国家自然科学基金

Abstract:

BACKGROUND: Cancellous bone, as an important part of bone, is a kind of porous, inhomogeneous, anisotropic and viscoelastic structure, which plays a critical role in load transmission and energy absorption. Therefore, research on its mechanical properties is of great significance.

OBJECTIVE: To investigate the compressive properties of cancellous bone at different stress rates and its creep behaviors at different stress levels.
METHODS: The fresh cancellous bone from pig femur was used as the material, and subjected to different stress until the compressive strain of sample was up to 5%. The constant compressive stress levels were loaded on the surface of cancellous bone for 7 200 s to observe its creep behaviors.
RESULTS AND CONCLUSION: (1) In the uniaxial compression test, the stress values and Young’s modulus increased with the stress rate increasing under the same strain value. (2) The stress-strain curves of cancellous bone were different at different loading rates, indicating that the mechanical properties of cancellous bone depend on the loading rate. (3) In the creep test, the creep strain increased with the increase of stress level, but the creep compliance decreased with the increase of stress level. (4) These results suggest that the stress rate and stress level have significant influence on compressive properties of cancellous bone, which provide reference for avoiding cancellous bone injury.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Stress, Mechanical, Biomechanics, Tissue Engineering

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