基于个性化的长管骨有限元参数化建模及实验验证

发布时间：2018-06-14 23:53

本文选题：骨生物力学 + 材料赋值　；参考：《南京理工大学》2012年硕士论文

【摘要】：随着数字图像处理技术的发展和计算机技术的不断进步,有限元法作为一种有效的工具广泛用于骨科生物力学研究中。目前骨骼有限元建模主要是根据骨骼CT图像灰度值建立几何和材料赋值,建模过程比较复杂,有限元前处理需要耗费大量时间。本文基于医学图像处理技术和有限元法对个性化长管骨进行有限元仿真研究。本文主要工作包括： (1)利用二维CT断层图像和Mimics软件,实现了人的长管骨三维重建。对比实物,重建的长管骨模型形态还原性高。基于CT断层扫描图像的灰度值构建了个性化长管骨的材料模型,模型的材料与真实分布接近。 (2)应用Abaqus软件进行长管骨整骨的压缩力学实验仿真,获得了不同材料数目下长管骨有限元模型的仿真结果,进行了有限元仿真结果与实测数据误差分析,讨论了密质骨和松质骨的材料赋值数目对有限元仿真结果影响,确定了长管骨材料合理的有限元材料赋值数目。 (3)针对长管骨骨干的结构特点,结合Mimics软件中提取几何信息和材料信息,在Abaqus软件平台上进行了参数化建模。通过开发的插件程序,输入长管骨的几何和材料参数,实现了长管骨有限元参数化建模。 (4)对长管骨参数化有限元模型进行压缩实验仿真,对比验证实验获得的生物力学数据,验证了参数化模型有限元仿真结果可靠性。本次基于个性化长管骨的有限元仿真研究,通过对骨骼材料合理赋值的探讨和长管骨的有限元参数化建模研究,进行了个性化长管骨快速有限元分析。此外,骨骼有限元材料合理赋值数目的确定,为今后骨骼仿真研究材料赋值提供参考。
[Abstract]:With the development of digital image processing technology and computer technology, finite element method (FEM) is widely used in orthopedic biomechanics as an effective tool. At present, the finite element modeling of bone is mainly based on the gray value of bone CT image to establish geometric and material assignment, the modeling process is more complex, finite element pre-processing takes a lot of time. Based on medical image processing technology and finite element method, this paper studies the finite element simulation of individualized long tube bone. The main work of this paper is as follows: 1) 3D reconstruction of human long tube bone is realized by using 2D CT tomography and Mimics software. Compared with real objects, the reconstructed long tube bone model had higher morphologic reducibility. Based on the gray value of CT scanning image, the material model of individual long tube bone is constructed. The material of the model is close to the real distribution. (2) Abaqus software is used to simulate the compression mechanics of the whole bone of long tube bone. The simulation results of finite element model of long tube bone with different number of materials are obtained. The error analysis of finite element simulation results and measured data are carried out. The effect of the number of materials assigned to dense bone and cancellous bone on the finite element simulation results is discussed. According to the structural characteristics of long tubular bone, geometric information and material information are extracted from mimics software, and parameterized modeling is carried out on the platform of Abaqus software. Through the developed plug-in program, the geometric and material parameters of the long tube bone are input, and the parameterized modeling of the long tube bone by finite element method is realized. (4) the compression experiment simulation of the long tube bone parameterized finite element model is carried out. The reliability of the finite element simulation results of the parameterized model is verified by comparing the biomechanical data obtained from the experiments. Based on the finite element simulation of individualized long tubular bone, the rapid finite element analysis of individual long tube bone was carried out through the study of reasonable evaluation of bone material and the finite element parameterized modeling of long tube bone. In addition, the determination of reasonable assignment number of bone finite element materials provides a reference for future bone simulation research.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.01;TB115

【引证文献】