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Titolo:
High-temperature large strain viscoelastic behavior of polypropylene modeled using an inhomogeneously strained network
Autore:
Sweeney, J; Collins, TLD; Coates, PD; Duckett, RA;
Indirizzi:
Univ7Bradford, IRC Polymer Sci & Technol, Dept Mech & Med Engn, Bradford BD Univ Bradford Bradford W Yorkshire England BD7 1DP Med Engn, Bradford BD Univ Leeds, IRC Polymer Sci & Technol, Leeds LS2 9JT, W Yorkshire, EnglandUniv Leeds Leeds W Yorkshire England LS2 9JT S2 9JT, W Yorkshire, England
Titolo Testata:
JOURNAL OF APPLIED POLYMER SCIENCE
fascicolo: 4, volume: 72, anno: 1999,
pagine: 563 - 575
SICI:
0021-8995(19990425)72:4<563:HLSVBO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-DENSITY POLYETHYLENE; PLASTIC-DEFORMATION; POLYMERS; COMPRESSION; EVOLUTION; TEXTURE;
Keywords:
constitutive equation; large deformation; polypropylene; finite element; necking;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Sweeney, J Univ7Bradford, IRC Polymer Sci & Technol, Dept Mech & Med Engn,Bradford BD Univ Bradford Bradford W Yorkshire England BD7 1DP Bradford BD
Citazione:
J. Sweeney et al., "High-temperature large strain viscoelastic behavior of polypropylene modeled using an inhomogeneously strained network", J APPL POLY, 72(4), 1999, pp. 563-575

Abstract

The effects of microstructural rearrangements during the stretching of semicrystalline polymers and the resultant inhomogeneous strains are modeled by rigid spheres embedded in a polymer network. This results in strain concentrations in the network, which is then caused to yield at realistic overall strains. To simulate the collapse of the original spherulitic morphology,the radii of the spheres decrease at a rate dependent on the shear stress imposed on them by the surrounding network. This results in time-dependent behavior. The resultant large strain viscoelastic model is implemented in acommercial finite element code and used to predict shapes of necking polypropylene sheet specimens at 150 degrees C. Rate dependence of stress and stress relaxation are also predicted, and the model is shown to be generally effective in its predictions of shapes and forces up to large deformations. (C) 1999 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/10/20 alle ore 05:40:42