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Titolo:
Deformation twinning during impact of a titanium cylinder numerical calculations using a constitutive theory based on multiple natural configurations
Autore:
Lapczyk, I; Rajagopal, KR; Srinivasa, AR;
Indirizzi:
Texas A&M Univ, Dept Engn Mech, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 n Mech, College Stn, TX 77843 USA
Titolo Testata:
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
fascicolo: 1-3, volume: 188, anno: 2000,
pagine: 527 - 541
SICI:
0045-7825(2000)188:1-3<527:DTDIOA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
INELASTIC BEHAVIOR;
Keywords:
twinning; natural configurations; rate of dissipation; stored energy; impact;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Rajagopal, KR Texas A&M Univ, Dept Engn Mech, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 e Stn, TX 77843 USA
Citazione:
I. Lapczyk et al., "Deformation twinning during impact of a titanium cylinder numerical calculations using a constitutive theory based on multiple natural configurations", COMPUT METH, 188(1-3), 2000, pp. 527-541

Abstract

It is well-known that polycrystalline metals (especially those with bcc orhcp structures), when subjected to impact, undergo two inelastic processes- slip and twinning. Since the work of Taylor [20] the former one has beenstudied extensively; while more recently, deformation twinning has attracted attention of some researchers, e.g. [3,1,22], Zerilli and Armstrong [22]suggested that the major effect of twinning is a refinement of the grain size. Based on this assumption, they proposed a model for twinning and showed that much better agreement with experiments can be obtained if, in addition to deformation by slip, deformation twinning is also considered. Similarconclusions were reached by Holt rt al. [5] who analyzed the Taylor impactof a titanium specimen. In this work, we concentrate on the processes associated with deformation twinning. We model twinning by using the theory introduced by Rajagopal and Srinivasa [17,18], which is based on multiple natural configurations tan outline of the theory is given in Section 2). The theory considers the energetics associated with twinning and it can predict the volume fraction of the twinned material at each point and time. In this study, we modal the Taylor impact of a titanium cylinder. We assume that the problem is axisymmetric and solve the full dynamic equations by using theGalerkin finite clement method. Our results show that the energy absorbed during twinning and the deformation due to twinning are relatively small, and the material twins more near the center line. We also demonstrate the dependence of the results on the initial grain size of the material. Specifically, by modeling two materials of widely differing grain sizes, we show that the large-grained material twins substantially more than the small-grained material. (C) 2000 Elsevier Science S.A. All rights reserved.

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Documento generato il 22/10/20 alle ore 07:37:55