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| 1 | Influence of thermal effects on elastohydrodynamic(EHD) lubrication behavior at high speeds显示文摘This paper describes a study of point contact elastohydrodynamic(EHD)lubrication behavior at high speeds(up to 20 m s1).Central film thicknesses were measured by optical interferometry device.The influence of slide-roll ratio and operating temperature on the central film thickness was determined.The influence of thermal effects on the reduction of film thickness was discussed via the analysis of numerical simulation method considering thermal effects.Subsequently,the experimental data was used to amend a set of unified parameters for the thermal corrections for different types of oil at high speeds. | LIANG He GUO Dan REDDYHOFF Tom SPIKES Hugh LUO Jian Bin | 2015 | Science China(Technological Sciences)2015，58，3： | 3 |
| 2 | Ultrasonic measurement of film thickness in mechanical seals显示文摘 | Tom Reddyhoff Rob Dwyer-Joyce Phil Harper | 2006 | Sealing Technology2006，，7： | 1 |
| 3 | Pneumatic programmable superrepellent surfaces显示文摘Morphological transformation of surface structures is widely manifested in nature and highly preferred for many applications such as wetting interaction;however,in situ tuning of artificial morphologies independent of smart responsive materials remains elusive.Here,with the aid of microfluidics,we develop a pneumatic programmable superrepellent surface by tailoring conventional wetting materials(e.g.,polydimethylsiloxane)with embedded flexible chambers connecting a microfluidic system,thus realizing a morphological transformation for enhanced liquid repellency based on a nature‐inspired rigid‐flexible hybrid principle(i.e.,triggering symmetry breaking and oscillator coupling mechanisms).The enhancement degree can be in situ tuned within around 300 ms owing to pneumatically controllable chamber morphologies.We also demonstrate that the surface can be freely programmed to achieve elaborated morphological pathways and gradients for preferred droplet manipulation such as directional rolling and bouncing.Our study highlights the potential of an in situ morphological transformation to realize tunable wettability and provides a programmable level of droplet control by intellectualizing conventional wetting materials. | Songtao Hu Xiaobao Cao Tom Reddyhoff Xijia Ding Xi Shi Daniele Dini Andrew J.deMello Zhike Peng Zuankai Wang | 2022 | Droplet2022，1，1： | 1 |
| 4 | The friction coefficient evolution of a TiN coated contact during sliding wear显示文摘 | Guojia Ma Liliang Wang Haoxiang Gao Jie Zhang Tom Reddyhoff | 2015 | Applied Surface Science2015，，： | 1 |
| 5 | Rigid–flexible hybrid surfaces for water-repelling and abrasionresisting显示文摘Droplets impacting solid superhydrophobic surfaces is appealing not only because of scientific interests but also for technological applications such as water-repelling.Recent studies have designed artificial surfaces in a rigid–flexible hybrid mode to combine asymmetric redistribution and structural oscillation water-repelling principles,resolving strict impacting positioning;however,this is limited by weak mechanical durability.Here we propose a rigid–flexible hybrid surface(RFS)design as a matrix of concave flexible trampolines barred by convex rigid stripes.Such a surface exhibits a 20.1%contact time reduction via the structural oscillation of flexible trampolines,and even to break through the theoretical inertial-capillary limit via the asymmetric redistribution induced by rigid stripes.Moreover,the surface is shown to retain the above water-repelling after 1,000 abrasion cycles against oilstones under a normal load as high as 0.2 N·mm−1.This is the first demonstration of RFSs for synchronous waterproof and wearproof,approaching real-world applications of liquid-repelling. | Songtao HU Weifeng HUANG Jinbang LI Tom REDDYHOFF Xiaobao CAO Xi SHI Zhike PENG Andrew DEMELLO Daniele DINI | 2023 | Friction2023，11，4： | 0 |
| 6 | A finite-element-aided ultrasonic method for measuring central oil-film thickness in a roller-raceway tribo-pair显示文摘Roller bearings support heavy loads by riding on an ultra-thin oil film(between the roller and raceway),the thickness of which is critical as it reflects the lubrication performance.Ultrasonic interfacial reflection,which facilitates the non-destructive measurement of oil-film thickness,has been widely studied.However,insufficient spatial resolution around the rolling line contact zone remains a barrier despite the use of miniature piezoelectric transducers.In this study,a finite-element-aided method is utilized to simulate wave propagation through a three-layered structure of roller-oil-raceway under elastohydrodynamic lubrication(EHL)with nonlinear characteristics of the i)deformed curvature of the cylindrical roller and ii)nonuniform distribution of the fluid bulk modulus along the circumference of the oil layer being considered.A load and speed-dependent look-up table is then developed to establish an accurate relationship between the overall reflection coefficient(directly measured by an embedded ultrasonic transducer)and objective variable of the central oil-film thickness.The proposed finite-element-aided method is verified experimentally in a rollerraceway test rig with the ultrasonically measured oil-flm thickness corresponding to the values calculated using the EHLtheory. | Pan DOU Tonghai WU Zhaopeng LUO Peiping YANG Zhongxiao PENG Min YU Tom REDDYHOFF | 2022 | Friction2022，10，6： | 0 |
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