松质骨吸能特性分析  

Analysis on energy absorption characteristics of the cancellous bone

作　　者：何一帆[1] 王璠[1] 

机构地区：[1]暨南大学力学与土木工程系,教育部“重大工程灾害与控制重点”实验室,广州510632

出　　处：《医用生物力学》2011年第6期514-520,共7页Journal of Medical Biomechanics

基　　金：国家自然科学基金资助项目(10572054),国家自然科学基金重点项目(11032005)

摘　　要：目的对不同位置、具有不同受力特性的4种松质骨细观模型进行吸能特性分析。方法使用有限单元法计算在单向冲击荷载下4种模型的吸能特性。结果根据各个模型的比吸能值,发现棱柱形细观结构模型为理想的吸能模型。为全面了解棱柱形细观结构模型的力学特性,进一步对其进行屈曲分析和扩展分析,发现1阶屈曲荷载为248.11 Mpa,单元间的影响对棱柱模型影响很小。结论处于不同位置松质骨的4种细观结构模型,可根据受力特点,作为吸能材料的细观结构模型,特别是可作为缓冲吸能复合材料夹层的细观模型。Objective To analyze the energy-absorption characteristics for four mesomechanical models of the cancellous bone at different locations with different mechanical properties. Methods Under one-way shocks, the finite element method was used to calculate the energy absorption characteristics of the four models. Results According to the energy absorption rate of four models, the model with prismatic structure was found to be an ide- al energy absorption model. The buckling and extension analysis was further carried out to comprehensively study mechanical properties of the model with prismatic structure, showing that its first-order buckling load was 248.1 ] Mpa with little influence on the adjacent pixels. Conclusions Four mesomechanical models of the can- cellous bone at different locations can be used as the mesomechanical model for energy absorption materials ac- cording to different mechanical properties, particularly as the mesomechanical model for the energy absorption sandwich composite material.

关 键 词：松质骨 细观模型 吸能特性 力学特性 有限元法 

分 类 号：R318.01[医药卫生—生物医学工程]