Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)
- Volume 22 Issue 3
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- Pages.483-492
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- 1998
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- 1226-4873(pISSN)
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- 2288-5226(eISSN)
DOI QR Code
A method of determining flow stress and friction factor using an inverse analaysis in ring compression test
링압축시험에서 역해석을 이용한 유동응력과 마찰상수 결정법
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Choi, Y.
(Graduate School of Busan National University) ;
- Kim, H.K. ;
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Cho, H.Y.
(Dept. of Mechanical Engineering, Chungbuk National University) ;
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Kim, B.M.
(Sheet Products Process Research Group, Busan National University) ;
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Choi, J.C.
(Sheet Products Process Research Group, Busan National University)
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최영
(부산대학교 대학원) ;
- 김호관 (부산지방중소기업청) ;
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조해용
(충북대학교 기계공학부) ;
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김병민
(부산대학교 정밀정형 및 금형가공 연구센터) ;
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최재찬
(부산대학교 정밀정형 및 금형가공 연구센터)
- Published : 1998.03.01
Abstract
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.
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