ABAQUS二次开发在骨重建仿真中的应用

Application of ABAQUS secondary development in bone remodeling simulation

本研究的目的是利用ABAQUS二次开发环境,将基于应变能密度准则的骨自优化理论,编写成骨重建仿真算法。可以提取仿真模拟的密度分布数据作为场变量以云纹图的形式显示出来。通过计算骨组织密度的变化趋势分析骨重建过程。建立二维悬臂梁模型,进行200步迭代计算。结果显示密度分布呈现出桁架结构,验证了基于ABAQUS二次开发环境的骨重建算法的正确性。进一步建立股骨近端模型,模拟其正常站立的受力情况。根据有限元分析得到的骨密度分布可以反映出股骨内部骨组织的主要结构特征。本研究基于Python语法设计骨重建迭代算法,可以方便提取并输出密度及其他力学参数作为场变量。

The purpose of this study is to use the secondary development environment of ABAQUS to compile the simulation algorithm of bone remodeling based on the theory of bone self optimization based on strain energy density criterion.This algorithm can extract the simulation density distribution data as field variables and display them in the form of cloud image.The bone remodeling process was analyzed by calculating the change trend of bone tissue density.A twodimensional cantilever beam model is established and 200 steps iterative calculation is carried out.The results show that the density distribution presents truss structure,which verifies the correctness of the bone remodeling algorithm based on ABAQUS secondary development environment.The proximal femur model was further established to simulate its normal standing force.According to the finite element analysis,the distribution of bone mineral density can reflect the main structural characteristics of bone tissue in femur.In this study,an iterative bone reconstruction algorithm is designed based on Python syntax,which can easily extract and output density and other mechanical parameters as field variables.