Publisher : The Korean Society of Mechanical Engineers
DOI : 10.22634/KSME-A.1918.104.22.1683
Title & Authors
A method of determining flow stress and friction factor using an inverse analaysis in ring compression test Choi, Y; Kim, H.K; Cho, H.Y; Kim, B.M; Choi, J.C;
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.