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Titolo:
An upper bound analysis of a process-induced side-surface defect in forgings Part 1: The velocity fields and power terms
Autore:
Moon, YH; Van Tyne, CJ; Gordon, WA;
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 Torrington Co, Ctr Adv Technol, Torrington, CT USA Torrington Co Torrington CT USA Co, Ctr Adv Technol, Torrington, CT USA
Titolo Testata:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
fascicolo: 1-3, volume: 99, anno: 2000,
pagine: 169 - 178
SICI:
0924-0136(20000301)99:1-3<169:AUBAOA>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Keywords:
upper bound analysis; side-surface cracks; flow pattern; kinematically admissible velocity field; pseudo-independent parameter;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
15
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 et al., "An upper bound analysis of a process-induced side-surface defect in forgings Part 1: The velocity fields and power terms", J MATER PR, 99(1-3), 2000, pp. 169-178

Abstract

An upper bound analysis for an axisymmetric forging with a double ram action has been developed. The results of the analysis provide the geometric and processing conditions that can be used to avoid the development of unacceptable side-surface cracks. Kinematically admissible velocity fields that satisfy the incompressibility condition and the velocity boundary conditionshave been determined and the corresponding upper bound solution for the flow pattern has been developed. To determine the conditions under which the process-induced surface cracks would occur, a kinematically admissible velocity field for defective flow was developed and analyzed by the upper boundapproach. An extra power term that accounts for the power dissipated during crack formation has been added to the upper bound power for defective flow. This first paper in a two-part series presents the velocity fields and theindividual power terms that were derived based upon these flow patterns, whilst the second paper shows the characteristics of the upper bound solution for this forging process. The second paper also presents the criteria forthe prevention of the side-surface defects that were determined based uponthe upper bound solution. (C) 2000 Elsevier Science S.A. All rights reserved.

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Documento generato il 04/12/20 alle ore 18:43:05