Consideration on Friction Laws and their Effect on Finite Element Solutions in Buk Metal Forming

체적소성가공에서 마찰법칙이 유한요소해석 결과에 미치는 영향에 관한 고찰

Effects of frictional laws on finite element solutions in bulk metal forming were investigated in this paper. The Coulomb friction and the constant shear friction law were compared through finite element anlayses of compression of ring and cylinders with different aspect rations, ring-gear forging and hot strip rollin under the isothermal condition. It has been shown that two laws may yield quite different results inthe case that the aspect ration of a process is large, for example , strip rolling and ring -gear forging and that the difference depends mainly on the aspect ratio and the friction.