J. Tribol.: All Topics http://scitation.aip.org/ J. Tribol.: All Topics Experimental Research on Drag Torque for Single-plate Wet Clutch http://link.aip.org/link/doi/10.1115/1.4005528 Hu Jibin, Peng Zengxiong, and Wei Chao<br/> The relative motion between the friction and separate plates in a disengaged wet clutch causes viscous drag torque when the lubrication fluid flows through the clearance. Reduction of the drag torque is one of the important potentials for the improvement of transmission efficiency. The objective of ... [J. Tribol. 134, 014502 (2012)] published Thu Feb 9, 2012. Effect of Nitro-Carburizing Treatment on Wear Mechanism and Friction of Steel/WC-Co Sliding Couple http://link.aip.org/link/doi/10.1115/1.4005521 F. Fazlalipour, N. Shakib, A. Shokuhfar, and M. Niki Nushari<br/> In this work, tribological behavior and material degradation mechanisms of Nitro-carburized AISI H11 hot work tool steel were investigated during sliding against cemented tungsten carbide (WC/Co). The diffusion layer with an iron-nitrocarbide (Fe (N,C)) compound layer was developed on pre-hardened t ... [J. Tribol. 134, 014501 (2012)] published Thu Feb 9, 2012. Analysis of Laminar Flow Over a Non-Conventional Random Rough Surface Based on Lattice Boltzmann Method http://link.aip.org/link/doi/10.1115/1.4005517 Ping Zhou, Dongming Guo, Renke Kang, and Zhuji Jin<br/> The average flow model offers a great convenience for the analysis of laminar flow over rough surfaces and is widely used in simulation studies. Flow factors used in the average flow model are generally expressed as a function of statistical properties of a single level rough surface with gentle slo ... [J. Tribol. 134, 012201 (2012)] published Thu Feb 9, 2012. A Lubrication Equation Incorporating Two-Dimensional Roughness Effects, With Emphasis on the Patterned Data Islands of a Recording Disk http://link.aip.org/link/doi/10.1115/1.4005519 James White<br/> Current industrial applications require a consideration of two-dimensional surface roughness effects in design and optimization of fluid bearings. Although the influence of striated surface roughness on fluid lubrication is now at a fairly mature level of understanding, the knowledge and understandi ... [J. Tribol. 134, 011901 (2012)] published Thu Feb 9, 2012. Hydrodynamic Lubrication of Conformal Contacting Surfaces With Parabolic Grooves http://link.aip.org/link/doi/10.1115/1.4005518 Yonghong Fu, Jinghu Ji, and Qinsheng Bi<br/> The effect of surface texturing in the form of parabolic grooves on the hydrodynamic lubrication properties is investigated in this paper. Numerical simulation of the pressure distribution of lubricant between a textured slider and a smooth, moving slider has been performed. The evaluation criterion ... [J. Tribol. 134, 011701 (2012)] published Thu Feb 9, 2012. Size Effect on the Behavior of Thermal Elastohydrodynamic Lubrication of Roller Pairs http://link.aip.org/link/doi/10.1115/1.4005515 Xiaoling Liu, Jinlei Cui, and Peiran Yang<br/> In order to investigate the size effect on elastohydrodynamic lubrication (EHL) of roller pairs, complete numerical solutions for both the Newtonian fluid and the Eyring fluid thermal EHL problems of roller pairs under steady state conditions have been achieved. It can be seen that there is no size ... [J. Tribol. 134, 011502 (2012)] published Thu Feb 9, 2012. The Influence of Construction Features of a Thin-Layer Sensor on Pressure Distributions Recorded in an Elastohydrodynamic Contact http://link.aip.org/link/doi/10.1115/1.4005520 Adam Wilczek<br/> This paper presents the experimental study of the construction features of a thin-layer sensor on the accuracy of pressure measurements in an EHD contact. Two common types of transducer shapes and isolating layers of the sensor, made of SiO are considered. The measurements were carried out on a two- ... [J. Tribol. 134, 011501 (2012)] published Thu Feb 9, 2012.