The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Wenyi Yan - One of the best experts on this subject based on the ideXlab platform.
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Contact Pressure evolution at the die radius in sheet metal stamping
Journal of Materials Processing Technology, 2009Co-Authors: M P Pereira, John L. Duncan, Wenyi Yan, Bernard F. RolfeAbstract:The Contact conditions at the die radius are of primary importance to the wear response for many sheet metal forming processes. In particular, a detailed understanding of the Contact Pressure at the wearing interface is essential for the application of representative wear tests, the use of wear resistant materials and coatings, the development of suitable wear models, and for the ultimate goal of predicting tool life. However, there is a lack of information concerning the time-dependant nature of the Contact Pressure response in sheet metal stamping. This work provides a qualitative description of the evolution and distribution of Contact Pressure at the die radius for a typical channel forming process. Through an analysis of the deformation conditions, Contact phenomena and underlying mechanics, it was identified that three distinct phases exist. Significantly, the initial and intermediate stages resulted in severe and localised Contact conditions, with Contact Pressures significantly greater than the blank material yield strength. The final phase corresponds to a larger Contact area, with steady and smaller Contact Pressures. The proposed Contact Pressure behaviour was compared to other results available in the literature and also discussed with respect to tool wear.
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Modeling of Contact Pressure in sheet metal forming
Materials Science Forum, 2007Co-Authors: Wenyi YanAbstract:For a given sheet metal forming process, an accurate determination of the Contact Pressure distribution experienced is an essential step towards the estimation of tool life. This investigation utilizes finite element (FE) analysis to determine the evolution and distribution of Contact Pressure over the die radius, throughout the duration of a channel forming process. It was found that a typical two-peak steady-state Contact Pressure response exists for the majority of the process. However, this was preceded by a transient response, which produced extremely large and localized Contact Pressures. Notably, it was found that the peak transient Contact Pressure was more than double the steady-state peak. These Contact Pressure results may have a significant influence on the tool wear response and therefore impact current wear testing and prediction techniques. Hence, an investigation into the validity of the predicted Contact Pressure was conducted.
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Contact Pressure and wear in sheet metal forming - an FEM analysis
2006Co-Authors: Wenyi YanAbstract:Wear is the principal cause of tool failure in most sheet metal forming processes. It is well known that the Contact Pressure between the blank and the tool has a large influence on the wear of the tool, and hence the tool life. This investigation utilises the finite element method to analyse the Contact Pressure distribution over the die radius for a particular deep drawing process. Furthermore, the evolution of the predicted Contact Pressure distribution throughout the entire stroke of the punch is also examined. It was found that the majority of the process shows a steady state Pressure distribution, with two characteristic peaks over the die radius, at the beginning and end of the sheet Contact area. Interestingly, the initial transient Contact Pressure response showed extremely high localised peak Pressures; more than twice that of the steady state peaks. Results are compared to wear reported in the literature, during similar experimental deep drawing processes. Finally, the significance and effect of the results on wear and wear-testing techniques are discussed.
Feng Qin Li - One of the best experts on this subject based on the ideXlab platform.
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Influence of Technical Parameters on Contact Pressure in Straight Bevel Gear Meshing
Applied Mechanics and Materials, 2014Co-Authors: Qiu Ping Luo, Xiao Shuang Xiong, Jian Cai, Song Deng, Feng Qin LiAbstract:Wear is one of the main failure modes of gears in the meshing performance, and Contact Pressure is the key factor to determine the wear of gears. The main purpose of this paper is to investigate the Contact Pressure distribution and evolution laws in straight bevel gear meshing. Based on a 3D FE model of the specific loaded assembling straight bevel gear pair, the influence of friction coefficient f, torque T and elastic modulus E on the Contact Pressure of straight bevel gear in a meshing circle is studied. The results show that the Contact area and Contact Pressure increase dramatically with the increase of the torque. The Contact area decreases and the Contact Pressure increases with the increase of elastic modulus. Friction coefficient almost has no effect on the Contact area and Contact Pressure. This research has great theoretical significance to reveal the wear mechanism and improve the meshing performance of straight bevel gears.
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Influence of Technical Parameters on Contact Pressure in Straight Bevel Gear Meshing
Applied Mechanics and Materials, 2014Co-Authors: Qiu Ping Luo, Xiao Shuang Xiong, Jian Cai, Song Deng, Feng Qin LiAbstract:Wear is one of the main failure modes of gears in the meshing performance, and Contact Pressure is the key factor to determine the wear of gears. The main purpose of this paper is to investigate the Contact Pressure distribution and evolution laws in straight bevel gear meshing. Based on a 3D FE model of the specific loaded assembling straight bevel gear pair, the influence of friction coefficient f, torque T and elastic modulus E on the Contact Pressure of straight bevel gear in a meshing circle is studied. The results show that the Contact area and Contact Pressure increase dramatically with the increase of the torque. The Contact area decreases and the Contact Pressure increases with the increase of elastic modulus. Friction coefficient almost has no effect on the Contact area and Contact Pressure. This research has great theoretical significance to reveal the wear mechanism and improve the meshing performance of straight bevel gears.
Antonius Lubrecht - One of the best experts on this subject based on the ideXlab platform.
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Detailed Contact Pressure between wire rope and friction lining
Tribology International, 2017Co-Authors: W. Ma, Antonius LubrechtAbstract:Abstract The authors have studied the Contact Pressure between a wire rope and a friction lining block. The current study is crucial for the subsequent work on frictional heating under sliding conditions. The Contact equations are solved on a fine grid, using multigrid techniques. Results from the numerical Contact model show that the local maximum Contact Pressure is about 45 times higher than the average one obtained from the “plane method” formula. Two approximate analytical calculations are proposed that give a maximum Contact Pressure with a relative error of the order of 10% with only a small computational effort.
Luc Mongeau - One of the best experts on this subject based on the ideXlab platform.
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Measurements of the Contact Pressure in human vocal folds
2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009Co-Authors: Li-jen Chen, Luc MongeauAbstract:The Contact Pressure experienced by human vocal folds during phonation is usually considered as the most likely source of phonotrauma. Direct Contact Pressure measurements using Pressure sensors were attempted, although some interference with vocal folds oscillation was found to occur. A nonintrusive approach for the Contact Pressure estimation from high speed images was therefore investigated, based on a Hertzian Impact model. A verification study of the accuracy of this method was performed. Results from the nonintrusive approach were compared with results from direct measurements using a physical model of the human vocal folds. The accuracy of the estimated Contact Pressure from the nonintrusive method was found to be acceptable. Disadvantages and possible sources of error are discussed.
Bernard F. Rolfe - One of the best experts on this subject based on the ideXlab platform.
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Contact Pressure evolution at the die radius in sheet metal stamping
Journal of Materials Processing Technology, 2009Co-Authors: M P Pereira, John L. Duncan, Wenyi Yan, Bernard F. RolfeAbstract:The Contact conditions at the die radius are of primary importance to the wear response for many sheet metal forming processes. In particular, a detailed understanding of the Contact Pressure at the wearing interface is essential for the application of representative wear tests, the use of wear resistant materials and coatings, the development of suitable wear models, and for the ultimate goal of predicting tool life. However, there is a lack of information concerning the time-dependant nature of the Contact Pressure response in sheet metal stamping. This work provides a qualitative description of the evolution and distribution of Contact Pressure at the die radius for a typical channel forming process. Through an analysis of the deformation conditions, Contact phenomena and underlying mechanics, it was identified that three distinct phases exist. Significantly, the initial and intermediate stages resulted in severe and localised Contact conditions, with Contact Pressures significantly greater than the blank material yield strength. The final phase corresponds to a larger Contact area, with steady and smaller Contact Pressures. The proposed Contact Pressure behaviour was compared to other results available in the literature and also discussed with respect to tool wear.
