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RISOn the Effects of Roughness Orientation—A Mapping and Double Scale Analysis of Flow Factors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A comprehensive approach for computing the lubricant flow as functions of the roughness orientation is presented. By using a mapping function, a periodic, anisotropic surface is transformed into ...
A Study on Flow Phenomena in Mixed Lubrication Regime by Porous Medium Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A porous medium model is basically a macroscopic description of the fluid behavior and is considered more appropriate to the mixed lubrication regime. The present work has successfully combined ...
A New Mechanism of Asperity Flattening in Sliding Contact—The Role of Tool Elastic Microwedge
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Based on real-time observation of the workpiece surface in a series of Lo and Tsai’s (2002) compression-sliding experiment, it is found that the asperity contact area is much greater than that ...
Optimum Blank Shapes for Prismatic Cup Drawing—Consideration of Friction and Material Anisotropy
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A theory employing the concept of potential flow and an easily implemented numerical method are developed. It can offer a preliminary prediction of the optimum blank shape with a little ...
Lubricant Permeation From Micro Oil Pits Under Intimate Contact Condition
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In the situation of serious tool-workpiece contact when a smooth surface is desired in metal forming, the lubricant is either enclosed within the micro pits or infiltrates the contact plateaus ...
A Theoretical Model of Micro-Pool Lubrication in Metal Forming
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A model of a secondary hydrodynamic lubrication mechanism, which is called micro-pool or micro-plasto hydrodynamic lubrication, has been developed. It shows that, with sufficiently high viscosity ...
Surface Roughening and Contact Behavior in Forming of Aluminum Sheet
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The evolution of the surface topography and tool-workpiece contact behavior of an aluminum sheet during plastic deformation has been investigated by a series of indentation tests for various ...
An Investigation of New Tribological Variables in Friction Modeling of Bulk Metal Forming
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The present “realistic” friction model is examined by a series of upsetting tests. Specimens made of different aluminum alloys and prepared by various processes display diverse results. Severe ...
Real-Time Observation of the Evolution of Contact Area Under Boundary Lubrication in Sliding Contact
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: To study the evolution of asperity contact in the sliding contact, a new in situ observation system of sheet metal surface is built up. The workpiece is stationary so that the continuous ...
A Model for Lubrication by Oil-in-Water Emulsions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A model for oil-in-water emulsion has been developed in this paper. A group of viscosity coefficients transiting smoothly and incessantly from the thick film region to the thin film region is ...