胶原纤维束对软骨力学性能影响的数值研究
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天津市先进机电系统设计与智能控制重点实验室

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天津市自然科学(18JCYBJC95200);国家自然科学基金项(11402171)


Numerical Analysis of the Mechanical Effect on Collagen Fiber Bundle of Articular Cartilage
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TianjinSKeySLaboratorySforSAdvancedSMechatronicSSystemSDesignSandSIntelligentSControl,STianjinSUniversitySofSTechnologyNationalSDemonstrationSCenterSforSExperimentalSMechanicalSandSElectricalSEngineeringSEducationS

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    摘要:

    摘要:目的:关节软骨中胶原纤维损伤被认为是关节早期退化的一种表现。方法:本文建立了一种纤维增强的多孔粘弹性二维数值模型,考虑了纤维分布、弹性模量、孔隙率和渗透率随软骨深度的变化关系。研究纤维束局部断裂和从表面渐进断裂以及纤维束尺寸对软骨力学性能的影响,获得软骨基质的最大主应变图。结果:表明基质的最大主应变出现在软骨中层靠上某个位置,此位置不受纤维断裂模式和纤维束尺寸的影响。含较粗纤维束的软骨的应变值降低结论:软骨中层易发生力学损伤,纤维束增粗可以降低基质的最大主应变,一旦纤维束发生断裂,较粗纤维束的软骨的基质最大主应变值更大,使软骨更易发生损伤演化情况。此研究结果可以为临床医生指导早期软骨损伤患者的康复运动提供参考数据。

    Abstract:

    Abstract: Objective Collagen fiber damage in the articular cartilage is considered to be a manifestation of early joint degeneration. Methods In this paper, two-dimensional numerical model of fiber-reinforced porous viscoelasticity was established, considering the relationship of fiber distribution, elastic modulus, porosity and permeability with cartilage depth. The maximum by studying influence of the local fracture of the fiber bundle,the progressive fracture from the surface and the fiber bundle size on the mechanical properties of the cartilage. Results The results showed that the maximum principal strain of the matrix occurred at a position in the middle layer of the cartilage, about upper 1/3 of cartilage, which was not affected by fiber breakage mode and fiber bundle size. The strain value of cartilage with thicker fiber bundles decreased.. Conclusions The middle layer of cartilage was prone to mechanical damage.The thicken fiber bundle could reduce the maximum principal strain of the matrix. Once the fiber bundle broke, the maximum principal strain of the matrix of the cartilage with thicker fiber bundle was larger, which made the cartilage damage evolution easier. The results of this study could provide reference data for clinicians to guide the rehabilitation project of patients with early cartilage injury.

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  • 收稿日期:2019-08-21
  • 最后修改日期:2019-12-13
  • 录用日期:2019-12-16
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