压缩载荷下不同应变判定皮质骨断裂准确性分析  

Prediction on Fracture Simulation Accuracy of Cortical Bone Using Different Strain Criteria under Compression Loads

作　　者：刘杰 戴晓锋[1] 吴华杰[1] 范若寻 贾政斌 LIU Jie;DAI Xiaofeng;WU Huajie;FAN Ruoxun;JIA Zhengbin(Department of Traffic Engineering,Yangzhou Polytechnic Institute,Yangzhou 225000,Jiangsu,China;Department of Aerospace Engineering,Jilin Institute of Chemical Technology,Jilin 132022,Jilin,China;School of Biological Science and Medical Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]扬州工业职业技术学院交通工程学院,江苏扬州225000 [2]吉林化工学院航空工程学院,吉林吉林132022 [3]北京航空航天大学生物与医学工程学院,北京100191

出　　处：《医用生物力学》2023年第4期718-723,共6页Journal of Medical Biomechanics

基　　金：吉林省教育厅科学技术研究项目(JJKH20210230KJ)。

摘　　要：目的寻找适合压缩断裂工况下的应变判据。方法基于连续损伤力学理论进行皮质骨在压缩载荷下的断裂模拟。分别将等效应变与主应变设置为有限元模型单元损伤与失效判据进行断裂模拟,通过对比两种预测结果与动物实验数据,探究应用两种应变判据进行断裂模拟的准确性。结果应用等效应变判据模拟的断裂时间晚于应用主应变模拟;相比等效应变,应用主应变进行仿真所得结果与动物实验结果更为接近。结论压缩载荷下,应用主应变判定皮质骨单元力学状态进行断裂模拟较为准确。通过对比分析找到准确模拟皮质骨在压缩载荷下断裂的数值方法,能够为临床中提高骨折预测精度提供理论基础。Objective To explore a suitable judging criterion of the strain under compressive fracture condition.Methods Fracture simulation of cortical bone structure under compression loads was performed based on the continuum damage mechanics theory.The principal strain and the equivalent strain were used to judge the damage and failure state in the element,and the fracture simulation was performed.Then,the simulation results were compared with the corresponding experimental data to determine the prediction accuracy by using two kinds of strains.Results The fracture time in the simulation using the equivalent strain was remarkably later than that using the principal strain.Compared with the equivalent strain,the simulation results obtained by applying the principal strain were closer to the animal experimental results.Conclusions Under compression loads,it is more accurate to use the principal strain to determine the mechanical state of cortical bone element for fracture simulation.Through comparative method,a feasible numerical simulation method can be found to accurately simulate the fracture of cortical bone under compression loads,which can provide theoretical basis for improving the fracture prediction accuracy in clinic.

关 键 词：皮质骨 压缩载荷 压缩断裂 主应变 等效应变 

分 类 号：R318.01[医药卫生—生物医学工程]