Numerical Simulation of Bone Plate with Fatigue Crack and Investigation of Attraction Hole for Retarding Crack Growth

Q4 Biochemistry, Genetics and Molecular Biology

Molecular & Cellular Biomechanics Pub Date : 2021-01-01 DOI:10.32604/mcb.2021.016238

Zhonghang Zhao, A. Ji, Changsheng Chen

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引用次数: 0

Abstract

Premature fracture of the bone plate caused by fatigue crack is the main failure mode in treating femoral shaft fracture. In order to improve the durability of the plate, this study proposed a crack attraction hole (CAH) to retard the crack propagation based on the fracture mechanics. In this paper, a numerical model of the femoral fracture internal fixation system was constructed, in which the femur was developed using a validated simplified model. First, the fatigue crack initiation location was defined at the stress concentration through static analysis. Next, with the joint simulation method of Franc3D and ABAQUS, the fatigue crack path in the bone plate was predicted. Meanwhile, the Paris parameters of Ti-6Al-4V obtained through experiments were encoded into Franc3D to calculate the crack propagation life. Finally, we considered the influence of CAH designs with different relative vertical distances (2.0, 3.0, and 4.0 mm) and diameters (1.5, 2.0, and 2.5 mm) on the crack propagation path and life of the bone plate. Additionally, the effects of all CAH configurations on the biomechanical performance of the bone plate fixation system were evaluated. The results indicated that the fatigue crack growth path in the bone plate is comparable to a straight line, and the crack growth rate significantly increases when the crack tip reaches the outer boundary of the plate. The findings suggest that the addition of CAH in the bone plate will lead to the deflection of the crack path and increase the fatigue life. Equally important, the improvement of the fatigue life was positively correlated with the diameter of CAH and negatively correlated with the relative vertical distance. In addition, the biomechanical properties of the bone plate system were slightly affected by CAH, substantiating the feasibility of this method. Finally, the comparative analysis verified that a CAH with a relative vertical distance of 3 mm and a diameter of 2 mm exhibited superior improvement in the comprehensive performance on the bone plate.

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带疲劳裂纹的骨板数值模拟及抑制裂纹扩展的吸引孔研究

疲劳裂纹引起的骨板过早断裂是治疗股骨干骨折的主要失效方式。为了提高板的耐久性，从断裂力学的角度出发，提出了采用裂纹吸引孔(CAH)来延缓裂纹扩展的方法。本文建立了股骨骨折内固定系统的数值模型，其中股骨采用经过验证的简化模型进行发展。首先，通过静力分析确定应力集中处的疲劳裂纹起裂位置;其次，利用Franc3D和ABAQUS联合仿真方法，对骨板疲劳裂纹路径进行预测。同时，将实验得到的Ti-6Al-4V的Paris参数编码到Franc3D中，计算裂纹扩展寿命。最后，我们考虑了不同相对垂直距离(2.0、3.0和4.0 mm)和直径(1.5、2.0和2.5 mm)的CAH设计对骨板裂纹扩展路径和寿命的影响。此外，我们还评估了所有CAH构型对骨板固定系统生物力学性能的影响。结果表明:骨板内疲劳裂纹扩展路径近似于一条直线，裂纹尖端到达骨板外边界时裂纹扩展速率显著增大;研究结果表明，在骨板中加入CAH会导致裂纹路径的偏转，提高疲劳寿命。同样重要的是，疲劳寿命的提高与CAH直径呈正相关，与相对垂直距离负相关。此外，CAH对骨板系统的生物力学性能影响较小，证实了该方法的可行性。最后通过对比分析证实，相对垂直距离为3 mm、直径为2 mm的CAH在骨板上的综合性能有较好的改善。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Molecular & Cellular Biomechanics CELL BIOLOGYENGINEERING, BIOMEDICAL&-ENGINEERING, BIOMEDICAL

CiteScore

1.70

自引率

0.00%

发文量

期刊介绍： The field of biomechanics concerns with motion, deformation, and forces in biological systems. With the explosive progress in molecular biology, genomic engineering, bioimaging, and nanotechnology, there will be an ever-increasing generation of knowledge and information concerning the mechanobiology of genes, proteins, cells, tissues, and organs. Such information will bring new diagnostic tools, new therapeutic approaches, and new knowledge on ourselves and our interactions with our environment. It becomes apparent that biomechanics focusing on molecules, cells as well as tissues and organs is an important aspect of modern biomedical sciences. The aims of this journal are to facilitate the studies of the mechanics of biomolecules (including proteins, genes, cytoskeletons, etc.), cells (and their interactions with extracellular matrix), tissues and organs, the development of relevant advanced mathematical methods, and the discovery of biological secrets. As science concerns only with relative truth, we seek ideas that are state-of-the-art, which may be controversial, but stimulate and promote new ideas, new techniques, and new applications.