超声激励下超声刀微裂纹发热的有限元分析  

FEM Thermal Analysis of Micro-cracks in Ultrasonic Scalpel under Ultrasonic Excitation

作　　者：郭心怡 周兆英[2] 谭秋林[1,2] 秦丽[1] 

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,太原030051 [2]清华大学精密仪器与机械学系,北京100084

出　　处：《科学技术与工程》2014年第30期172-175,共4页Science Technology and Engineering

基　　金：山西省回国留学人员科研资助项目(2013-077)资助

摘　　要：超声手术刀具的疲劳问题突出。采用有限元法,对工作中的超声钛合金手术刀具表面的微裂纹进行动力学仿真,分析了缺陷处的动接触和发热问题。基于罚函数和界面本构摩擦模型,以平衡主控-从属接触算法和整体-局部接触搜索法为超声手术刀具建立瞬态动力学有限元模型。仿真结果定量地计算了裂纹附近瞬态温度场的分布,分析了裂纹两个面的相对动接触行为,解释了超声在裂纹处进行选择性加热的机理。Fatigue issue is the main concern of ultrasonic surgical scalpel.Micro-cracks in ultrasonic surgical scalpel made of titanium alloy in working condition is simulated with finite element model and dynamical contact behavior together with heat conduction is also analyzed.Based on penalty contact mode and interface constitutive friction model,a dynamic finite element model is established with master-slave contact algorithm and global-local contact search algorithm.The results demonstrate the distribution of transient temperature field around crack quantitatively,analyze the dynamic contact behavior of surfaces of crack and explain the mechanism of selective heating on crack surfaces.

关 键 词：超声手术刀 微裂纹 超声红外检测 有限元 

分 类 号：TN219[电子电信—物理电子学]