矩形微缺损关节软骨在压缩载荷下损伤演化的数值分析

发布时间：2018-03-29 21:27

  本文选题：微缺损　切入点：软骨　出处：《医用生物力学》2017年02期

【摘要】：目的研究软骨在压缩载荷作用下的损伤扩展行为和演变机制。方法采用有限元方法建立微缺损的纤维增强多孔弹性的软骨模型,对压缩载荷作用下损伤演化过程进行模拟和参数研究,获得不同损伤扩展阶段软骨基体和纤维的应力、应变分布规律。结果软骨损伤表层和损伤前沿的应变随压缩量的增大而显著增大,两者呈明显的正相关性;在软骨演化过程中同时存在向深层和左右两侧扩展的趋势;软骨中的裂纹和损伤优先沿着纤维切线方向延伸,随着损伤的加剧,软骨横向扩展度明显快于纵向扩展速度。结论软骨损伤演化过程与纤维的分布有着密切的关系,基质和纤维的损伤相互促进,骨演化速度和程度在不同层区和不同阶段存在变化。研究结果可为软骨创伤性退变的预测及修复提供定性的参考,为临床解释损伤退变病理现象和治疗提供理论依据。
[Abstract]:Objective to study the damage propagation behavior and evolution mechanism of cartilage under compression loading. The stress of cartilage matrix and fiber in different damage extension stages was obtained by simulating and studying the damage evolution process under compression loading. Results the strain of the surface layer and the front of the cartilage damage increased significantly with the increase of the compression amount, and the two strains showed a positive correlation, and there was a tendency to expand to the deep layer and the left and right sides during the evolution of the cartilage. The cracks and injuries in cartilage preferentially extend along the tangent direction of the fibers. With the increase of the injury, the degree of transverse expansion of cartilage is obviously faster than that of the longitudinal extension. Conclusion the evolution of cartilage injury is closely related to the distribution of fibers. The damage of matrix and fiber is mutually reinforcing, and the velocity and degree of bone evolution vary in different layers and stages. The results can provide a qualitative reference for the prediction and repair of traumatic degeneration of cartilage. To provide a theoretical basis for clinical interpretation of pathological phenomena and treatment of injury degeneration.
【作者单位】： 天津理工大学机械工程学院天津市先进机电系统设计与智能控制重点实验室;
【基金】：国家自然科学基金项目(11402171,11372221,11432016)
【分类号】：R318.01;R68
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本文编号：1682957