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Volume 10 No. 2
05 February 2022

Zhifeng LIU,Mengmeng LIU,Caixia ZHANG,Hongyan CHU,Liran MA,Qiang CHENG,Hongyun CAI,Junmin CHEN

2022, 10(2): 179-199.   doi:10.1007/s40544-020-0474-0
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Sum-frequency generation (SFG) vibrational spectroscopy is a second-order nonlinear optical spectroscopy technique. Owing to its interfacial selectivity, SFG vibrational spectroscopy can provide interfacial molecular information, such as molecular orientations and order, which can be obtained directly, or molecular density, which can be acquired indirectly. Interfacial molecular behaviors are considered the basic factors for determining the tribological properties of surfaces. Therefore, owin...

Shuai WU,Yuqing HE,Quanshui ZHENG,Ming MA

2022, 10(2): 200-208.   doi:10.1007/s40544-020-0396-x
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The presence of a capillary bridge between solid surfaces is ubiquitous under ambient conditions. Usually, it leads to a continuous decrease of friction as a function of bridge height. Here, using molecular dynamics we show that for a capillary bridge with a small radius confined between two hydrophilic elastic solid surfaces, the friction oscillates greatly when decreasing the bridge height. The underlying mechanism is revealed to be a periodic ordered-disordered transition at the liquid-sol...

Shengcong WU,Zhisen MENG,Xiaoma TAO,Zhao WANG

2022, 10(2): 209-216.   doi:10.1007/s40544-020-0418-8
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The friction between a molybdenum disulphide (MoS2) nanoflake and a MoS2 substrate was analyzed using a modified Tomlinson model based on atomistic force fields. The calculations performed in the study suggest that large deformations in the substrate can induce a dramatic decrease in the friction between the nanoflake and the substrate to produce the so-called superlubricity. The coefficient of friction decreases by 1-4 orders of magnitude when a high strain exceeding 0....

Yuqin WEN,Jinyuan TANG,Wei ZHOU,Lin LI,Caichao ZHU

2022, 10(2): 217-231.   doi:10.1007/s40544-020-0419-7
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The contact calculation of three-dimensional real rough surfaces is the frontier field of tribology and surface science. In this study, we consider the interaction and elastic-plastic deformation characteristics of asperities and further, propose an analytical contact calculation method for rough surfaces considering the interaction of asperities. Based on the watershed algorithm, the rough surface is segmented and the asperities are reconstructed into ellipsoids. According to the height rela...

Kuan ZHANG,Jielai YANG,Yulong SUN,Yi WANG,Jing LIANG,Jing LUO,Wenguo CUI,Lianfu DENG,Xiangyang XU,Bo WANG,Hongyu ZHANG

2022, 10(2): 232-246.   doi:10.1007/s40544-020-0437-5
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The occurrence of osteoarthritis is closely related to progressive and irreversible destruction of the articular cartilage, which increases the friction significantly and causes further inflammation of the joint. Thus, a scaffold for articular cartilage defects should be developed via lubrication restoration and drug intervention. In this study, we successfully synthesized gelatin-based composite hydrogels, namely GelMA-PAM-PMPC, with the properties of biomimetic lubrication and sustained dru...

Wei CAO,Tao HE,Wei PU,Ke XIAO

2022, 10(2): 247-267.   doi:10.1007/s40544-020-0477-x
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To assess the meshing quality of spiral bevel gears, the static meshing characteristics are usually checked under different contact paths to simulate the deviation in the footprint from the design point to the heel or toe of the gear flank caused by the assembly error of two gear axes. However, the effect of the contact path on gear dynamics under lubricated conditions has not been reported. In addition, most studies regarding spiral bevel gears disregard the lubricated condition because of t...

Xiuhua QIU,Linghong LU,Zhenyu QU,Jiongtao LIAO,Qi FAN,Faiz Ullah SHAH,Wenling ZHANG,Rong AN

2022, 10(2): 268-281.   doi:10.1007/s40544-021-0486-4
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The nanofrictional behavior of non-halogentated phosphonium-based ionic liquids (ILs) mixed with diethylene glycol dibutyl ether in the molar ratios of 1:10 and 1:70 was investigated on the titanium (Ti) substrate using atomic force microscopy (AFM). A significant reduction is observed in the friction coefficient μ for the IL-oil mixtures with a higher IL concentration (1:10, μ ~ 0.05), compared to that for the lower concentration 1:70 (μ ~ 0.1). AFM ...

Hyeonho CHO,Joonho LEE,Hyundo HWANG,Woonbong HWANG,Jin-Gyun KIM,Sunghan KIM

2022, 10(2): 282-295.   doi:10.1007/s40544-021-0490-8
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Understanding the mechanical properties of bionanofilms is important in terms of identifying their durability. The primary focus of this study is to examine the effect of water vapor annealed silk fibroin on the indentation modulus and hardness of graphene oxide-silk fibroin (GO-SF) bionanofilms through nanoindentation experiments and finite element analysis (FEA). The GO-SF bionanofilms were fabricated using the layer-by-layer technique. The water vapor annealing process was employed to enha...

Lucija ČOGA,Somayeh AKBARI,Janez KOVAČ,Mitjan KALIN

2022, 10(2): 296-315.   doi:10.1007/s40544-021-0491-7
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In this work, we evaluated the effect of the counter-body material (the same or dissimilar) and contact configuration (moving or stationary body), at similar contact tribological conditions, on the tribochemical and nanotopography characteristics of adsorbed surface films. Zinc dialkyldithiophosphate (ZDDP), the best performing anti-wear additive, was used in self-mated steel/steel and DLC/DLC contacts, which were compared with mixed steel/DLC and DLC/steel contacts in 1-h and 6-h sliding tes...

Jenny VENEMA,Javad HAZRATI,Eisso ATZEMA,David MATTHEWS,Ton van den BOOGAARD

2022, 10(2): 316-334.   doi:10.1007/s40544-021-0504-6
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The accurate description of friction is critical in the finite element (FE) simulation of the sheet metal forming process. Usually, friction is oversimplified through the use of a constant Coulomb friction coefficient. In this study, the application of an existing multiscale friction model is extended to the hot stamping process. The model accounts for the effects of tool and sheet metal surface topography as well as the evolution of contact pressure, temperature, and bulk strain during hot s...