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Titolo:
LARGE DEFORMATIONS OF SEMICRYSTALLINE POLYMER MODELED USING THE NECKING NETWORK CONCEPT
Autore:
SWEENEY J; COLLINS TLD; COATES PD; UNWIN AP; WARD IM;
Indirizzi:
UNIV BRADFORD,DEPT MECH & MFG ENGN,IRC POLYMER SCI & TECHNOL BRADFORDBD7 1DP W YORKSHIRE ENGLAND UNIV LEEDS,IRC POLYMER SCI & TECHNOL LEEDS LS2 9JT W YORKSHIRE ENGLAND
Titolo Testata:
Journal of engineering materials and technology
fascicolo: 3, volume: 119, anno: 1997,
pagine: 228 - 232
SICI:
0094-4289(1997)119:3<228:LDOSPM>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
6
Recensione:
Indirizzi per estratti:
Citazione:
J. Sweeney et al., "LARGE DEFORMATIONS OF SEMICRYSTALLINE POLYMER MODELED USING THE NECKING NETWORK CONCEPT", Journal of engineering materials and technology, 119(3), 1997, pp. 228-232

Abstract

Previously, a physically-based elastic model has been used in the modeling of high temperature polymer deformation. While this has been successful in producing realistic shapes and forces in necking polymers, the elastic nature of the theory causes some discrepancies between thepredictions and the experimental observations. The theory does not describe the observed rate dependence of drawing forces, and at some stages of deformation the predicted inhomogeneity is greater than is observed. The latter effect is the result of the elastic theory's ability to change instantaneously from a homogeneous to an inhomogeneous stateof strain, corresponding to the development of a neck. In this paper,we model the development of necks in tensile specimens using an extension of the model in which rate dependence has been incorporated in a simple way. The incorporation of rate dependence results in a model ofneck development in which the changes in strain are less abrupt and the predicted shapes mor realistic. To evaluate the model, specimens ofpolypropylene were stretched at 150 degrees C and their images captured and analysed digitally. Predictions of the shapes were generated byincorporating the model into the finite element package ABAQUS.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 13:15:21