Effect of friction history of workpiece on friction behaviour in metal forming

[摘要] This paper describes the influence of friction histories of the specimen surface on frictional behaviour measured by a side-stretching type testing method under lubricated conditions with various loading and unloading patterns of the average contact pressure. The lubricant with lower viscosity has no lubricating effect and the influence of friction histories on frictional behaviour is hardly found. The lubricating effect of the lubricant with higher viscosity is recognized under higher pressures and the specimens with different friction histories give a little higher frictional stress. It is concluded that the influence of the friction history of the specimen surface on the friction law in metal forming is negligibly small.

[发布机构] Department of Mechanical Engineering, Gifu University, Gifu, Japan^1;Gifu University, Gifu, Japan^2

[效力级别] 材料工程

[关键词] Contact pressures;Friction behaviour;Friction laws;Frictional stress;Loading and unloading;Lower viscosities;Lubricating effect;Specimen surfaces