Biomimetic muscle—The slipping/sliding friction mechanism (SFM) for dynamic agile animal robots**F. Nickols, Singapore patent no. 190737 awarded 29 May 2014 entitled; “Apparatus and an assembly for emulating an impulse force exerted by a skeletal muscle.” Patent owned by Nanyang Technological University, Singapore.

2015 ◽  
pp. 199-224
Author(s):  
F. Nickols
Keyword(s):  
Skeletal Muscle ◽  
Sliding Friction ◽  
Friction Mechanism ◽  
Technological University ◽  
Impulse Force

Research on the Friction Performance of Bionic Surface Based on the Clamber Animal Foot Pad

2013 ◽  
Vol 427-429 ◽  
pp. 298-301
Author(s):  
Chun Jian Su ◽  
Zhou Yu Fu ◽  
Hui Sun ◽  
Xiao Shen
Keyword(s):  
Sliding Friction ◽  
External Surface ◽  
Surface Friction ◽  
Friction Mechanism ◽  
Micro Particles ◽  
Bionic Surface ◽  
Friction Performance ◽  
Foot Pad ◽  
The Mathematical Model ◽  
Center Distance

The clamber animal foot pads were researched by the Super Depth of Field3D Microscopic System marked VHX-600 and the flexible non-smooth surface friction mechanism of clamber animal foot pad was analysed through bionic tribology. The total friction includes two aspects: a) The sliding friction caused by the adsorbability between clamber animal foot pad and external surface. b) The embedding resistance caused by the external surface micro particles embedded into clamber animal foot pad. The mathematical model of single convex hull was built and the different center distance bionic surfaces were designed, the friction contact simulation of bionic surface was done by ANSYS and the friction performance of bionic surface was verified through the plane friction testbed.

scholarly journals Tribological properties of MoS2 coating for ultra-long wear-life and low coefficient of friction combined with additive g-C3N4 in air

Friction ◽  
2020 ◽  
Author(s):  
Yupeng Zhang ◽  
Panpan Li ◽  
Li Ji ◽  
Xiaohong Liu ◽  
Hongqi Wan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Solid Lubricant ◽  
Sliding Friction ◽  
Friction Mechanism ◽  
X Ray ◽  
Lubricating Film ◽  
Valence States ◽  
Transmission Electron ◽  
Wear Life

Abstract The solid lubricant MoS2 demonstrates excellent lubricating properties, but it spontaneously oxidizes and absorbs moisture in air, and thus results in poor wear resistance and short wear-life. In this study, the additive g-C3N4 (CN) was successfully combined with MoS2 via hydrothermal synthesis as a solid lubricant for the first time. Meanwhile, a low friction coefficient (COF, μ = 0.031) and ultra-long wear-life of CN/MoS2 compared to pure MoS2 in air were demonstrated. The functional groups and good crystallinity of the lubricant material were characterized via Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The formed valence states in CN/MoS2 were analyzed via X-ray photoelectron spectroscopy (XPS). The characterized results of the scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) show the morphology and interior crystal phase structure of CN/MoS2. From the cross-section analysis, the presence of iron oxide nanoparticles lubricating film is synergistic with CN/MoS2 film during the friction process, resulting in its ultra-long wear-life. In particular, the friction mechanism of interlayer sliding friction combined with energy storage friction was analyzed and proposed.

Design and Analysis on the Increasing Friction Mechanism of the Convex-Hull-Typed Bionic Driving Drum

2012 ◽  
Vol 472-475 ◽  
pp. 2562-2567
Author(s):  
Hui Sun ◽  
Lin Jing Xiao ◽  
Chun Jian Su
Keyword(s):  
Convex Hull ◽  
Friction Force ◽  
Sliding Friction ◽  
Measuring System ◽  
Convex Hulls ◽  
Tree Frog ◽  
Friction Mechanism ◽  
Bionic Surface ◽  
Additional Resistance ◽  
Rubber Belt

The micro textures in the foot surface of the animals such as locust and tree frog have been analyzed with the bionic tribology and several kinds of the convex-hull-typed bionic driving drums are designed. According to the friction mechanism of the rubber material and the simulation results by the software ANSYS, the increasing friction mechanism of the convex-hull-typed bionic driving drum is analyzed. When the convex-hull-typed bionic driving drum contacts with the rubber belt, besides the sliding friction force, the friction force between them also includes the additional resistance resulted from the inlaying ‘meshing effect’ between the convex hulls and the rubber belt. The convex hulls on the surface diminish the contact area, so does the sliding friction force. Therefore, only if the additional resistance greater than the decrease of the sliding friction force, the convex-hull-typed bionic surface can increase the friction force. The dynamic tension measuring system of the belt conveyor is designed and manufactured to measure the friction coefficient between the belt and the driving drum. The experiment results prove that the convex-hull-typed bionic driving drums that meet the certain conditions have the increasing friction effect. The research achievement can be used in many situations which need increase the friction force.

Numerical investigation of sliding friction behaviour and mechanism of engineering surfaces

2019 ◽  
Vol 71 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Xiaogang Zhang ◽  
Yali Zhang
Keyword(s):  
Surface Roughness ◽  
Friction Coefficient ◽  
Sliding Friction ◽  
Normal Load ◽  
Numerical Results ◽  
Operating Conditions ◽  
Friction Mechanism ◽  
Content Type ◽  
Optimal Surface ◽  
Friction Behaviour

Purpose This study aims to investigate the sliding friction behaviour and mechanism of engineering surfaces. Design/methodology/approach A new numerical approach is proposed. This approach derives the macroscale friction coefficient from microscale asperity interactions. By applying this approach, the sliding friction behaviour under different operating conditions were investigated in terms of molecular and mechanical components. Findings Numerical results demonstrate an independent relationship between normal load and friction coefficient, which is governed by the saturated plastic ratio. Numerical results also demonstrate that under very small load, an increase in load increases the friction coefficient. In addition, numerical results confirm the existence of optimal surface roughness where the friction coefficient is the lowest. For the surface profiles used in the current calculation, an optimal surface roughness value is obtained as Rq = 0.125 μm. Originality/value This new approach characterizes the deterministic relationship between macroscale friction coefficient and microscale asperity molecular/mechanical interactions. Numerical results facilitate the understanding of sliding friction mechanism.

Study on the Automatic Emergency Shelter Device of Tire’s Bursting

2012 ◽  
Vol 468-471 ◽  
pp. 1270-1273
Author(s):  
Jian Guo Chen ◽  
Ying Yu
Keyword(s):  
High Speed ◽  
Sliding Friction ◽  
Rolling Friction ◽  
Good Prospect ◽  
Emergency Shelter ◽  
Friction Mechanism ◽  
Support Plate ◽  
The Moment

Abstract. An emergency shelter device is proposed to address the major accidents of rear wheels out of balance due to the tire’s bursting of high-speed car. The design uses the support plate mechanism, in the moment of the tire’s bursting, which would balance the car automatically, when TPMS system issues commands. It achieves the purpose of supporting the car balance and travel that the curved design and calculation of the support plate using sliding friction and rolling friction mechanism, which could effectively avoid secondary accidents caused by the tire’s bursting and have a good prospect.

scholarly journals Tribochemical Behavior of Pure Magnesium During Sliding Friction

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 311 ◽  
Author(s):  
Yan Zhou ◽  
Jinfang Peng ◽  
Mengjie Wang ◽  
Jiliang Mo ◽  
Changguang Deng ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Sliding Friction ◽  
Pure Magnesium ◽  
Surface Oxide Layer ◽  
Chemical Behavior ◽  
Friction Mechanism ◽  
X Ray ◽  
Reciprocating Sliding ◽  
Electron Probe Micro Analyzer ◽  
Worn Surface

Reciprocating sliding friction tests were conducted on pure magnesium using a UMT-II tester. The tribo-chemical behavior was characterized using X-ray photoelectron spectroscopy (XPS) and electron probe micro-analyzer (EPMA), which showed that the tribo-chemical behavior of pure magnesium was due to a tribo-oxidation reaction. At room temperature, the debris layer on the worn surface contained Mg(OH)2, MgO, and MgCO3. According to the reciprocating sliding friction mechanism, the decomposition of MgCO3 into MgO should occur. XPS results revealed that the surface oxide layer, containing Mg(OH)2, and MgO, acted as a third layer to protect the surface. Apparently, Mg(OH)2·nH2O was the main tribo-chemical product of pure magnesium under sliding friction.

Wearability of SiCP Particle Reinforced Aluminum Matrix Composites Creeper Tread

2011 ◽  
Vol 299-300 ◽  
pp. 727-734
Author(s):  
Zhi Ming Du ◽  
Jin Qin ◽  
Jun Liu ◽  
Gang Chen ◽  
Hai Meng Jia ◽  
...  
Keyword(s):  
Particle Size ◽  
Sliding Friction ◽  
Volume Fraction ◽  
Mixing Time ◽  
Aluminum Matrix ◽  
High Strength ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Friction Mechanism ◽  
Brittle Phase

Wearability of SiCpreinforced aluminum matrix composites creeper treads was studied. Wear resistance of these creeper treads was tested by sliding friction pin-disk tester at room temperature. Friction morphology was observed and the friction mechanism of these creeper treads was investigated. The experiment parameters such as SiCpparticle size, volume fraction, mixing temperature, mixing time were adjusted and the best parameters were found through the tests. The results showed that the creeper tread had the most excellent wearability, high strength and hardness with 875r/min mixing speed, 40min~60min mixing time, 660°C~700°C mixing temperature, 7μm SiCpparticle size and the 10vol% SiCpvolume fraction. There were no microscopic holes and other defects in these dense composite materials. The interface between SiCpand Al matrix was clean and straight, where Al4C3brittle phase wasn't observed.

Analysis on the Friction Performance of the Bionic Surface with the Convex Domes for Increasing Friction

2012 ◽  
Vol 232 ◽  
pp. 102-105
Author(s):  
Hui Sun ◽  
Lin Jing Xiao ◽  
Chuan Yu Sun
Keyword(s):  
Friction Force ◽  
Sliding Friction ◽  
Research Result ◽  
Structural Features ◽  
Contact Transformation ◽  
Theory Analysis ◽  
Friction Mechanism ◽  
Bionic Surface ◽  
Additional Resistance ◽  
Friction Performance

The surface micro textures on the feet of the animals such as flies, geckos and tree frogs have been studied. According to the research result and the science of the bionic tribology, the bionic surfaces with the convex domes which possess the certain structural features are obtained. They can increase the friction coefficient. The increasing friction mechanism of the bionic surface with the convex domes is analyzed using the methods of theory analysis, simulation and experimental verification. The friction force between the bionic surface with the convex domes and the belt consists of the sliding friction force and the additional resistance resulting from the inlaying meshing effect. The contact transformation of the bionic surface with cylindrical convex domes and the belt is simulated by the software ANSYS. The increasing friction effect of the bionic surface with the cylindrical convex domes is verified by the experiments.

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