Exploring the relevance between load-bearing capacity and surface friction behavior based on a layered hydrogel cartilage prototype  

作　　者：Yunlei ZHANG Weiyi ZHAO Xiaoduo ZHAO Jinshuai ZHANG Bo YU Shuanhong MA Feng ZHOU 

机构地区：[1]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China [3]Shandong Laboratory of Yantai Advanced Materials and Green Manufacture,Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering,Yantai 264006,China

出　　处：《Friction》2024年第8期1757-1770,共14页摩擦（英文版）

基　　金：financial support from National Natural Science Foundation of China(22032006,52075522,52322506);Strategic Priority Research Program of the Chinese Academy of Sciences(XDB 0470201);Outstanding Youth Fund of Gansu Province(21JR7RA095);Key Research Project of Shandong Provincial Natural Science Foundation(ZR2021ZD27);Gansu Province Basic Research Innovation Group Project(22JR5RA093);West Light Foundation of The Chinese Academy of Sciences(xbzg-zdsys-202211).

摘　　要：Cartilage is well lubricated over a lifetime and this phenomenon is attributed to both of the surface hydration lubrication and the matrix load-bearing capacity.Lubricious hydrogels with a layered structure are designed to mimic cartilage as potential replacements.While many studies have concentrated on improving surface hydration to reduce friction,few have experimentally detected the relationship between load-bearing capacity of hydrogels and their interface friction behavior.In this work,a bilayer hydrogel,serving as a cartilage prototype consisted of a top thick hydrated polymer brush layer and a bottom hydrogel matrix with tunable modulus was designed to investigate this relationship.The coefficient of friction(COF,μ)is defined as the sum of interfacial component(μInt)and deformation/hysteresis component(μHyst).The presence of the top hydration layer effectively dissipates contact stress and reduces the interface interaction(μInt),leading to a stable and low COF.The contribution of mechanical deformation(μHyst)during the sliding shearing process to COF can be significantly reduced by increasing the local mechanical modulus,thereby enhancing the load-bearing capacity.These results show that the strategy of coupling surface hydration layer with a high load-bearing matrix can indeed enhance the lubrication performance of hydrogel cartilage prototypes,and implies a promising routine for designing robust soft matter lubrication system and friction-control devices.

关 键 词：soft contact hydration deformation load-bearing friction control 

分 类 号：TH117[机械工程—机械设计及理论]