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Titolo:
Validation via FEM and plasticine modeling of upper bound criteria of a process-induced side-surface defect in forgings
Autore:
Moon, YH; Van Tyne, CJ;
Indirizzi:
Pusan Natl Univ, Engn Res Ctr Net Shape & Die Mfg, Pusan 609735, South Korea Pusan Natl Univ Pusan South Korea 609735 Mfg, Pusan 609735, South Korea Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 USA Colorado SchMines Golden CO USA 80401 t & Mat Engn, Golden, CO 80401 USA
Titolo Testata:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
fascicolo: 1-3, volume: 99, anno: 2000,
pagine: 185 - 196
SICI:
0924-0136(20000301)99:1-3<185:VVFAPM>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Keywords:
finite element method; physical modeling; plasticine experiment; upper bound analysis; side-surface defect; criteria curve; ring compression test; axisymmetric forging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Moon, YH Pusan Natl Univ, Engn Res Ctr Net Shape & Die Mfg, San 30 Jangjeondong, Pusan 609735, South Korea Pusan Natl Univ San 30 Jangjeondong PusanSouth Korea 609735 rea
Citazione:
Y.H. Moon e C.J. Van Tyne, "Validation via FEM and plasticine modeling of upper bound criteria of a process-induced side-surface defect in forgings", J MATER PR, 99(1-3), 2000, pp. 185-196

Abstract

Finite element analysis and plasticine modeling has been performed for an axisymmetric forging with a double ram action to validate the results of upper bound analysis which provided the geometric and processing conditions that can be used to avoid the development of unacceptable side-surface cracks. The finite element analysis, by using NIKE2D, an implicit finite deformation FEM program, has provided detailed information about the stress- and strain-states that the workpiece experiences and shows that large axial strains develop in the mid-thickness region at small workpiece thicknesses, which correlates to the conditions of surface-crack formation as predicted by the upper bound analysis. Surface cracks obtained in an FEM analysis of twohalf-billet workpieces have shown excellent agreement with the trends developed through the upper bound analysis. The physical modeling experiments with plasticine have provided further validation of both the upper bound model and the criteria curves for the prevention of side-surface defects. The process of side-surface cracking in a double action axisymmetric forging process was analyzed by the upper bound method. The results of this analysis are presented elsewhere (Y.H. Moon, C.J. Van Tyne, W.A. Gordon, J. Mater. Process. Technol., WTRA, pp. 412, 413). The prime objective of the present paper is to provide validation of the cracking criteria that was developed, this validation being done by both the numerical finite element methodand by the use of plasticine modeling material with plexiglass tooling in laboratory experiments. (C) 2000 Elsevier Science S.A. All rights reserved.

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Documento generato il 04/12/20 alle ore 19:20:23