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Relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system

Chinese Science Bulletin 2008年第9期53卷 1435-1443页

作者： LIU HongTao1,2,3 & GE ShiRong1,3 1 Institute of Tribology and Reliability Engineering, China University of Mining & Technology, Xuzhou 221116, China 2 College of Mechanical and Electrical Engineering, China University of Mining & Technology, Xuzhou 221116, China 3 biotribology center, State Key Laboratory of Tribology, Xuzhou 221116, China Institute of Tribology and Reliability Engineering China University of Mining & Technology Xuzhou China College of Mechanical and Electrical Engineering China University of Mining & Technology Xuzhou China biotribology center State Key Laboratory of Tribology Xuzhou China

MiaoXAM2.5X-50X Ultrahigh Precision Surface 3D Profiler is introduced to research the relations be- tween thickness of UHMWPE’s wear debris and positive pressure of tribological system. Research re- sults show that thickness of wear debris owns evident classification, and the first grade thickness math model and the second grade thickness math model are built. By the second grade thickness math model, the true force condition in the tribological system can be gotten, and the model can be used as a tool to modify simulating parameters of the tribological system, and it is an important inspecting method to the airtight system which cannot be examined in real time. The first grade thickness math model can describe the true working load and surface condition of work piece in the tribological sys- tem, and is an effective description method for the running condition of frictional pairs. The research results at different lubricating conditions testify the relations between thicknesses of wear debris and positive pressure of the tribological system. The fractal relation between maximal thickness of wear debris and positive pressure is discussed. The conceptions of the immutability principle and charac- teristic granularity of wear debris thickness are brought forward and discussed. In conclusion, as a stable tribological parameter owning mechanical theory basis, wear debris thickness will play an im- portant part in fault diagnosis, especially for the airtight system such as artificial joint.

关键词：摩擦学磨损面厚度分形数学模型

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Research on the friction and wear mechanism of Poly(vinyl alcohol)/hydroxylapatite composite hydrogel

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Science China(Technological Sciences) 2009年第8期52卷 2474-2480页

作者： ZHANG DeKun SHEN YanQiu GE ShiRong School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116China biotribology center State Key Laboratory of TribologyTsinghua UniversityBeijing 100083China Long Pan College Jin Ling Institute of TechnologyNanjing 211169China

Poly(vinyl alcohol)/Hydroxylapatite(PVA/HA) composite hydrogel was prepared with poly(vinyl alcohol) and hydroxylapatite as raw materials, using the method of repeated freezing and *** morphologies of PVA/HA composite hydrogel were observed by means of high-accuracy 3D profiler and scanning electron microscope(SEM).The compressive elastic modulus and the stress relaxation characteristics of PVA/HA composite hydrogel were measured using the flat-head cylinder *** friction and wear tests between PVA/HA composite hydrogel and bovine knee articular cartilage were performed on the *** worn morphologies of PVA/HA composite hydrogel were observed with environmental scanning electron microscope(ESEM).The results showed that PVA/HA composite hydrogel has the cross-link network microstructure which is similar to that of the natural bovine knee articular *** the increase of freezing-thawing cycles and the HA content, the degree of cross-link and the crystallization of PVA/HA composite hydrogel both increase, the elastic modulus increases evidently, the rate of stress relaxation is improved and the value of balance stress *** friction coefficient decreases with the increase of the freezing-thawing cycles and the HA *** more the freezing-thawing cycles are, the earlier the friction coefficient reaches the stable balance *** friction deformation depth between PVA/HA composite hydrogel and bovine knee articular cartilage is inversely proportional to freezing-thawing cycles and the HA *** main wear mechanisms of PVA/HA composite hydrogel are plastic flowing and adhesive *** wear severity degree decreases with the increase of freezing-thawing cycles and the HA content.

关键词： poly(vinyl alcohol) hydroxylapatite composite hydrogel microstructure tribological properties

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The Influence of Normal Load and Sliding Speed on Frictional Properties of Skin

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Journal of Bionic Engineering 2008年第1期5卷 33-38页

作者： Wei Tang Shi-rong Ge Hua Zhu Xi-chuan Cao Ning Li Institute of Tribology and Reliability Engineering School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou 221116 P. R. China biotribology center of the State Key Laboratory of Tribology China University of Mining and Technology Xuzhou 221116 P. R. China

The study of frictional properties of human skin is important for medical research, skin care products and textile exploi- tation. In order to investigate the influence of normal load and sliding speed on the frictional properties of skin and its possible mechanism, tests were carded out on a multi-specimen friction tester. When the normal load increases from 0.1 N to 0.9 N, normal displacement and the friction coefficient of skin increase. The friction coefficient is dependent on the load, indicating that both adhesion and deformation contribute to the friction behaviour. The deformation friction was interpreted using the plough model of friction. When sliding speed increases from 0.5 mm·s^-1 to 4 mm·s^-1, the friction coefficient increases and ＂stick-slip＂ phenomena increase, indicating that hysteretic friction contributes to the friction. The hysteretic friction was in- terpreted using schematic of energy translation during the rigid spherical probe sliding on the soft skin surface, which provides an explanation for the influence of the sliding speed on the frictional characteristics of the skin.

关键词： normal load sliding speed friction coefficient skin

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Friction behavior of coupling motion for natural articular cartilage by reciprocating rotation

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Chinese Science Bulletin 2009年第4期54卷 576-583页

作者： QIAN ShanHua1,2,3 & GE ShiRong1,3 1 College of Mechano-electronic Engineering, China University of Mining & Technology, Xuzhou 221116, China 2 Institute of Tribology and Reliability Engineering, China University of Mining & Technology, Xuzhou 221116, China 3 biotribology center, State Key Laboratory of Tribology, Xuzhou 221116, China College of Mechano-electronic Engineering China University of Mining & Technology Xuzhou China Institute of Tribology and Reliability Engineering China University of Mining & Technology Xuzhou China biotribology center State Key Laboratory of Tribology Xuzhou China

Based on the irregular surface of natural cartilage configurations, the tribological characteristics of coupling motion between natural cartilage pairs were investigated by the variation of rotated offset and velocity. Contact displacement, contact load, friction force and coefficient of friction from natural cartilage pairs were measured by a UMT-2 testing machine. In order to obtain the steady part and wavy part, the contact load and contact displacement were decompounded by the five-point sliding average method. These results showed that the contact load was composed of steady load and wavy load. And the contact displacement was composed of cartilage deformation and surface outline. The steady load was similar to exterior load while natural cartilage deformation increased nonlinearly with the sliding time. Wavy load had the correlative coefficient 0.235 with surface outline due to the irregular surface of friction configurations. The coefficient of friction from cartilage friction configurations was less influenced by smaller magnitude in rotated parameters. A few strange summits were obtained in the area of coef-ficient of friction, and significantly related with local minimal values corresponding to the contact loads. The rotated offsets had clear impact on contact load and a slight impact on contact displacement. Larger offset produced higher wavy magnitude of the contact load. The rotated velocities played an evident role in cartilage deformation, but had a less influence on contact load. Lower velocity brought larger cartilage deformation.

关键词：软骨构造关节软骨摩擦系数软骨变形接触装

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Research on the Long Time Swelling Properties of Poly (vinyl alcohol)/Hydroxylapatite Composite Hydrogel

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Journal of Bionic Engineering 2009年第1期6卷 22-28页

作者： De-kun Zhang~(1,3), Da-gang Wang~2, Jun-jie Duan~(1,3), Shi-rong Ge~(2,3)1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China2. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China3. biotribology center, National Key Laboratory of Tribology, Tsinghua University, Beijing 100083, P. R. China School of Materials Science and Engineering China University of Mining and Technology Xuzhou P. R. China biotribology center National Key Laboratory of Tribology Tsinghua University Beijing P. R. China School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou P. R. China

Poly(vinyl alcohol)/hydroxylapatite(PVA/HA)composite hydrogel was prepared by repeated freezing and *** water loss properties of the resultant hydrogel were investigated by using optical *** time immersion tests of PVA/HA composite hydrogel were carried out in the diluted calf serum solution to study the change laws of swelling properties with the freezing-thawing cycles and HA *** micro-morphologies of PVA/HA composite hydrogel after long time immersion were observed by means of the high-accuracy 3D *** results show that the swelling process of PVA/HA composite hydrogel is the converse process of its water *** time swelling ratio curves of PVA/HA composite hydrogel in the calf serum solution are manifested as four stages of quick increase,decrease,slow decrease and stable balance,and its equilibrium swelling ratio decreases with the increase of freezing-thawing cycles and HA *** is revealed that the network structure of the composite hydrogel immersed for a long period is significantly improved with the increase of HA content. Perfect network structures of PVA/HA composite hydrogel as well as full and equilibrium tissues after swelling equilibrium are obtained when the HA content is 3% and the number of freezing-thawing cycles is 7.

关键词： poly (vinyl alcohol) hydroxyapatite composite hydrogel swelling property morphology

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A study on the biocompatibility of ramie fibre for medical dressing application

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Biosurface and biotribology 2023年第4期9卷 169-175页

作者： Changsheng Wei Shibing Xiong Siqi Zhang Yifan Cui Simeng Wang Xugang Lu Jun Chen Mei Zhang Bangcheng Yang Engineering Research center in Biomaterials Sichuan UniversityChengduChina National Engineering Research center for Biomaterials ChengduChina Sichuan Guojia Biomaterials Co. LtdChengduChina

In order to explore the potential application of Ramie fibre(RF)in medical dressing,the absorbency ratio of ramie fibre cloth,medical gauze and natural cotton fibre cloth was tested,and the factors affecting the absorbency ratio of materials were ***,the hemocompatibility of the three fibre materials were also *** results showed that the RF cloth had good moisture absorption and ***,RF is a potential material for medical dressing.

关键词： biocompatibility biointerface

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Topographical biointerface regulating cellular functions for bone tissue engineering

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Biosurface and biotribology 2022年第3期8卷 165-187页

作者： Mingyu Zhu Rui Zhang Zhixiang Mao Ju Fang Fuzeng Ren Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhenGuangdongChina Department of Prosthodontics Stomatology CenterPeking University Shenzhen HospitalShenzhenGuangdongChina

The physiochemical properties of the implant interface significantly influence cell growth,differentiation,cellular matrix deposition,and mineralisation,and eventually,determine the bone regeneration *** directly sense and respond to the physical,chemical,and mechanical cues of the implant surface,and it is increasingly recognized that surface topography can evoke specific cellular responses,conferring biological functions on substrate materials and regulating tissue *** progress towards the fundamental understanding of the interplay between the cell and topographical surface has been made by combined advance in fabrication technologies and cell ***,the precise fabrication and control of nano/microscale topographies can provide the fundamental knowledge of the mechanotransduction process that governs the cellular response as well as the knowledge of how the specific features drive cells towards a defined differentiation *** this review,we first introduce common techniques and substrate materials for designing and fabricating micro/nanotopographical surfaces for bone *** then illustrate the intrinsic relationship of topological cues,cellular signal transduction,and cell functions and fates in osteogenic ***,we discuss the challenges and the future of using topological cues as a cell therapy to direct bone tissue regeneration.

关键词： interface eventually surface

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Morphology and gene expression of sex‐determining region Y‐box 9 and runt‐related transcription factor 2 in centrifugally compressed cell collagen‐combined constructs (C^(6))

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Biosurface and biotribology 2023年第3期9卷 78-83页

作者： Xu Ye Masashi Yamazaki Wataru Ando Norimasa Nakamura Hiromichi Fujie Faculty of System Design Tokyo Metropolitan UniversityTokyoJapan Research center for Medicine‐Engineering Collaboration TokyoJapan Department of Orthopaedic Surgery Kansai Rosai HospitalAmagasakiJapan Department of Orthopaedic Surgery Osaka University Graduate School of MedicineSuitaJapan Institute for Medical Science in Sports Osaka Health Science UniversityOsakaJapan center for Advanced Medical Engineering and Informatics Osaka UniversitySuitaJapan

The authors previously developed a scaffold‐free tissue‐engineered construct(TEC)from mesenchymal stem cells(MSCs).Although the TEC exhibited even cell distribution and was successfully applied for cartilage repair in animal models,it is unsuitable for relatively large‐scale cartilage defects due to its small *** solve the problem,the authors recently developed a novel biomaterial,a centrifugally compressed cell‐collagen combined construct(C^(6))from a mixture of MSCs and atelocollagen,both of which are subjected to *** results of the previous study indicated that C^(6) exhibited high cell viability(70%)and sufficient cell distribution similar to that of the *** the present study,the morphology and gene expression of C^(6) were *** ex-amination indicated that C6 is six times thicker(approximately 1 mm)than the TEC after a 7‐day *** C^(6) remained unchanged in scale with increased cell density after a 21‐day *** electron microscopic observation indicated that C^(6) exhibited interconnected and porous microstructures,while the TEC had close‐knit *** transcriptase‐polymerase chain reaction analysis indicated that the expression of sex‐determining region Y‐box 9 and runt‐related transcription factor 2 was significantly higher in C^(6) than that in TEC.

关键词： biomaterials cartilage microstructures

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Flow field characteristics and drag reduction performance of high-low velocity stripes on the biomimetic imbricated fish scale surfaces

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Biosurface and biotribology 2024年第3期10卷 132-141页

作者： Dengke Chen XianXian Cui Huawei Chen College of Transportation Ludong UniversityYantaiShandongChina School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Advanced Innovation center for Biomedical Engineering Beihang UniversityBeijingChina

Improving energy efficiency and cost reduction is a perennial challenge in *** biological systems have evolved unique functional surfaces or special physiological functions over centuries to adapt to their complex *** these biological wonders,fish,one of the oldest vertebrate groups,has garnered significant attention due to its exceptional fluid dynamics *** are actively exploring the potential of fish skin's distinctive structural and material characteristics in reducing *** this study,models of biomimetic imbricated fish scale are established,and the evolution characteristics of the flow field and drag reduction performance on these bionic surfaces are *** results showed a close relationship between the high-low velocity stripes generated and the fluid motion by the imbricated fish scale *** stripes'prominence increases with the spacing of the adjacent scales and tilt angle of the fish scale,and the velocity amplitude of the stripes decreases as the exposed length of the imbricated fish scale surface ***,the biomimetic imbricated fish scale surface can decrease the velocity gradient and thereby reduce the wall shear *** insights gained from the fish skin-inspired imbricated fish surface provide valuable perspectives for an in-depth analysis of fish hydrodynamics and offer fresh inspiration for drag reduction and antifouling strategies in engineering applications.

关键词： bionic surface drag reduction

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Controllable deformation based self-adaptive drag reduction for complex surface

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Biosurface and biotribology 2023年第1期9卷 17-23页

作者： Dengke Chen Xianxian Cui Huawei Chen College of Transportation Ludong UniversityYantaiShandongChina School of Mechanical Engineering and Automation Beihang UniversityBeijingChina Advanced Innovation center for Biomedical Engineering Beihang UniversityBeijingChina

Reduction of energy consumption and improvement of cruising speed are greatly necessary for underwater ***,regular riblets have been machined and the drag reduction has been verified;however,the riblet parameters are not adjusted like the denticles of sharkskin,which adapt quickly to the complex changing fluid *** achieve an improved drag reduction effect on the complicated shape surface,a simple,low-cost,and timesaving stretching approach was proposed to adjust the riblet parameters on the underwater vehicle surface by controllable *** latex rubber membrane with regular micro-riblets was prepared as a stretching flexible film,and the spacing and height of the micro-riblets were adjusted by adaptive control of the stretching *** circulating water channel experiment verified the effectiveness and feasibility of the selfadaptive drag reduction by the controllable deformation *** results demonstrated that the drag reduction rate of the controllable deformation bionic fish skin was 4.26%compared with a smooth surface at 0.25 m/s with an angle of attack of 0°,which is better than any other *** controllable deformation bionic fish skin provides a feasible method for the drag reduction of complex surface adaptive underwater vehicles.

关键词： biointerface bionic design biosurface friction

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