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마찰에 민감한 긴 파이프의 축관 및 확관 동시공정의 해석을 통한 마찰법칙의 평가
최인수(InSu Choi),엄재근(JaeGun Eom),전병윤(ByungYoon Jun),이민철(MinCheol Lee),전만수(ManSoo Joun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Frictional laws are criticized with emphasis on their application to bulk metal forming simulation in this paper. Coulomb frictional law and constant shear frictional law are investigated in detail in terms of their effect on metal forming process. A friction sensitive bulk metal forming process, a long-pipe simultaneously shrinking and expanding process, is introduced and the problems of the constant shear frictional law are revealed comparing the predictions obtained by the Coulomb frictional law and the constant shear frictional law with the experiments. It is shown that the constant shear frictional law is improper in the case that the normal stress varies very much from position to position and that the normal stress is low compared with flow stress of the adjacent material. It is also shown that the Coulomb frictional constant is more or less affected by the normal stress.