假肢材料与人体下肢皮肤界面的摩擦特性  

Frictional Properties on Human Skin of Lower Limb/prosthetic Material Interface

作　　者：徐萍[1] 石磊[2] 庞强[1] 李炜[1] 

机构地区：[1]西南交通大学材料先进技术教育部重点实验室摩擦学研究所,成都610031 [2]西南交通大学生命科学与工程学院,成都610031

出　　处：《机械工程学报》2015年第5期83-89,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51175440;51290291)

摘　　要：采用UMT-II多功能摩擦磨损试验机,在往复摩擦模式下模拟假肢接收腔/残肢皮肤界面,研究了4种不同表面结构的硅胶内衬套材料与皮肤的摩擦学行为。结果表明:硅胶材料/皮肤界面、接收腔/硅胶材料界面在往复摩擦模式初期均会产生相对滑动,摩擦因数较大;随着界面间产生黏着,摩擦因数减小,逐渐趋于稳态。硅胶材料反面上的粗大微凸体,增加了与皮肤的粘结性,摩擦能耗减少;正面上的针织结构不但增加了往复摩擦过程中与接受腔之间的相对滑动量及摩擦能耗,而且减少了其反面与皮肤往复摩擦过程中皮肤协调位移时的变形,从而降低了与皮肤之间的摩擦因数和能量损耗,因此,有利于降低皮肤摩擦损伤的风险,提高残肢患者穿戴舒适性。By using an UMT-II tribometer to simulate prosthetic socket/residual limb skin interface under a reciprocating sliding wear mode, the terminological behavior between four kinds of prosthetic silicone material with different surface structure and limb skin is investigated. The results show that the relative sliding occurred on the both silicone material/skin interface and prosthetic socket/silicone material interface at the beginning of the reciprocating wear mode, consequently, the friction coefficient is relatively high. Then it decreased and gradually reached steady with the adhesion appearing on the interfaces. The coarse micro convex body on the back of silicone material increased the adhesion with skin, which resulted in less friction consumption energy. The knitting structure on the front of silicone material not only increased the relative sliding and friction consumption energy with prosthetic socket, but also decreased the accommodation of skin elastic deformation between the back of silicone material and skin during reciprocating friction process. Thereby, the friction coefficient and the energy consumption on the interface reduce. In conclusion, the silicone material with the coarse micro convex body on the back and the knitting structure on the reverse side would lower the risk of skin damage and eventually improves the wearing comfort of amputees.

关 键 词：硅胶材料 下肢皮肤 摩擦行为 能量损耗 表面结构 

分 类 号：TH117[机械工程—机械设计及理论]