基于SPH-FEM手指模型的皮肤摩擦行为分析  

Skin frictions based on SPH-FEM finger model

作　　者：陈思[1,2] 乔筱祺 李天博 王颢[3] 杨佳楠[1] 王冬青 CHEN Si;QIAO Xiaoqi;LI Tianbo;WANG Hao;YANG Jianan;WANG Dongqing(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Department of Mechanical Enginee-ring,University of Colorado,Boulder,CO 80309,US;School of Electrical and Information Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Medicine,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]科罗拉多大学博尔德分校机械工程学院,博尔德,科罗拉多州80309 [3]江苏大学电气信息工程学院,江苏镇江212013 [4]江苏大学医学院,江苏镇江212013

出　　处：《排灌机械工程学报》2019年第12期1067-1071,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省自然科学基金资助项目(BK20170552);国家自然科学基金资助项目(51805218);中国博士后科学基金面上资助项目(2018M632239);江苏省博士后基金资助项目(1701063C);江苏大学高级人才科研启动基金资助项目(16JDG060)

摘　　要：针对基于传统有限元算法(FEM)的手指模型并不能很好地模拟皮肤大变形的问题,提出了一种基于有限元和光滑粒子动力学耦合算法(SPH-FEM)的手指建模方法,以保证模型在大变形和极端变形情况下的适应性.由于该方法本身具有的"无网格"特性,其对皮肤组织表现出流固双相特性的模拟上对比传统的FEM方法具有天然优势.建立了基于SPH-FEM手指建模方法的手指模型,进行尖刺刺入仿真试验和平板摩擦仿真试验,考察皮肤的应力应变.为了验证SPH-FEM手指建模方法的合理性和有效性,对基于SPH-FEM手指模型与基于FEM手指建模方法进行比较.结果表明,SPH-FEM手指模型在整体形变趋势上与FEM手指模型较为一致,并且在应对大变形时响应速度相较于FEM手指模型明显加快,但存在一定的滞后性;SPH-FEM手指模型在小变形时的精度稍显不足.A finger modeling method based on finite element and smooth particle dynamics coupling algorithm( SPH-FEM) was proposed while optimizing the adaptability of the model under large and extreme deformation,to solve the problem that the traditional Lagrange FEM finger-modeling had great deviation for large deformation and the solid-fluid biphasic behavior of subcutaneous tissue. In addition,due to the ″meshless″ property of the SPH-FEM method itself,it has a natural advantage on the simulation of the skin tissue exhibiting fluid-solid biphasic properties over the traditional finite element method( FEM). SPH-FEM finger model was established. The spike penetration simulation experiment and the plate friction simulation experiment were carried out to investigate the stress and strain of skin. In addition,in order to verify the rationality and effectiveness of the SPH-FEM finger modeling me-thod,it was compared with the FEM finger model. The results show that the SPH-FEM finger model is consistent with the traditional FEM method in the overall deformation,and the response speed is significantly higher than that of the FEM finger model when dealing with large deformation,but there is a certain hysteresis. The accuracy of the SPH-FEM finger model in small deformation is slightly insufficient.

关 键 词：生物流体 有限元和光滑粒子动力学耦合算法 手指模型 有限元分析 摩擦 

分 类 号：S810.6[农业科学—畜牧学]