拉压断裂模拟下中空皮质骨结构不同失效准则适应性分析  

Adaptability Analysis of Different Failure Criteria on Hollow Cortical Bone Structure under Tensile and Compressive Fracture Simulation

作　　者：范若寻 王溢童 苗前程 胡辰[1] 贾政斌 FAN Ruoxun;WANG Yitong;MIAO Qiancheng;HU Chen;JIA Zhengbin(Jiangsu Automotive Lightweight Engineering Technology Research and Development Center,Yangzhou Polytechnic Institute,Yangzhou 225127,Jiangsu,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江苏省汽车轻量化工程技术研究开发中心,江苏扬州225127 [2]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》2025年第1期86-92,共7页Journal of Medical Biomechanics

基　　金：江苏省高校“青蓝工程”中青年学术带头人项目;江苏省汽车轻量化工程技术研究开发中心项目。

摘　　要：目的 探究适合模拟中空皮质骨结构在拉伸与压缩断裂模式下的失效准则。方法 根据前期压缩与弯曲实验数据,结合断裂仿真,对比不同失效准则模拟结果,确定模拟准确度。结果 压缩载荷下,应用主应变与不变量应变失效准则模拟断裂载荷与实验数值差异小于5%,同时断裂模式也与实验相符,说明两种失效准则可准确预测皮质骨压缩断裂;弯曲载荷下,应用等效应变与不变量应变失效准则模拟皮质骨断裂载荷与实验数值差异小于5%,且断裂模式也与实验相符,说明两种失效准则可准确预测弯曲断裂。结论 不同失效准则模拟的准确程度主要取决于应变增速是否符合当前载荷环境下骨单元变形实际情况,应变增速过快或过缓会导致结构提前或滞后断裂。断裂模拟方法能够适应多数部位与形状的皮质骨结构,可广泛应用于探究不同载荷环境下的适合失效准则,从而协助获取各部位皮质骨强度极限,为临床中提高骨断裂预测精度与掌握骨折发生条件提供数据支撑。Objective To explore the failure criterion that can accurately simulate the tensile and compressive fracture of hollow cortical bone structure.Methods Based on the previous compression and bending experimental data,the predicted results using different failure criteria were compared to determine the simulation accuracy.Results Under the compressive load,the differences in the fracture load between the simulations using the equivalent and invariant strain failure criteria and the experiment were less than 5%,indicating that these two failure criteria were suitable for predicting the cortical bone failure;under the bending load,the differences in the fracture load between the simulations using the equivalent and invariant strain failure criteria and the experiment were less than 5%,indicating that these two failure criteria could accurately predict the failure process.Conclusions The prediction accuracy using different failure criteria mainly depends on whether the strain growth rate conforms to the actual bone deformation.Too fast or too low strain growth rate will lead to premature or delayed structural fracture.The fracture simulation adopted in this study is suitable for most cortical bone structures,and can be used to determine the suitable failure criterion under different loads,so as to assist in obtaining the strength limit of cortical bone in various parts and provide data support for improving the simulation accuracy and grasping the condition of fracture occurrence in clinical practice.

关 键 词：失效准则 皮质骨 压缩 三点弯曲 断裂模拟精度 

分 类 号：R318.01[医药卫生—生物医学工程]