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링압축시험에서 역해석을 이용한 유동응력과 마찰상수 결정법
최영,김호관,조해용,김병민,최재찬,Choi, Y.,Kim, H.K.,Cho, H.Y.,Kim, B.M.,Choi, J.C. 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
An inverse analysis been applied to obtain the flow stress of the material. In this method, a ring-shaped specimen is compressed between two flat tools. This procedure employs, as the object function of inverse analysis, the balance of measured loads and reaction forces calculated by using rigid-plastic finite element method. The balance is explicit scalar function of flow stress which is a function of some unknown constants. For minimizing the balance, Newton-Raphon scheme is used. The friction factor, m, between flat tools and the specimen is determined by using friction area-divided method. The proposed method allows an accurate identification by avoiding the usual assumptions made in order to convert experimental measures into stress-strain relation. In this paper, the proposed method is numerically tested. A commercial pure aluminum was selected, as an example, to apply the method and the results are compared with stress-strain relation obtained by experiments.