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Article: On deformation mechanisms of β-polypropylene 3. Lamella structures after necking and cold drawing

TitleOn deformation mechanisms of β-polypropylene 3. Lamella structures after necking and cold drawing
Authors
KeywordsΒ-Polypropylene
Deformation Mechanism
Necking And Cold Drawing
Issue Date1999
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polymer
Citation
Polymer, 1999, v. 40 n. 13, p. 3641-3656 How to Cite?
AbstractA β-PP sample was stretched to necking at room temperature and the morphologies of the deformed material over the necking region were examined with SEM and TEM. Before yielding, the strain was mainly accommodated between horizontal lamellae. Nevertheless, some vertical lamellae were stretched to break when the material approached yielding. At the yield point, many melt spots and deformation bands across vertical lamellae emerged. Some vertical lamellae became highly stretched and their thickness reduced significantly while the neighboring horizontal lamellae rotated towards the loading direction. At the upper shoulder of neck, the melt spots near the poles of spherulites enlarged and elongated in the stress direction, meanwhile, strain-induced crystals appeared in the melt spots. Furthermore, many vertical lamellae were broken into short fragments and some horizontal lamellae were sheared in the loading direction when the adjacent vertical lamellae were stretched heavily. In the tapered section of the neck, the original β-spherulites were shattered due to excessive crazing and deformation bands and some highly drawn material domains were formed. In turn, more shear bands were generated roughly along the loading direction. The horizontal lamella fragments rotated towards the loading direction and fed into the material flow continually. Finally, the lamella-spherulite structure was converted into an oriented fibril structure in the cold drawn material. Based on the observed results the deformation mechanisms of necking and cold drawing were discussed. (C) 1999 Elsevier Science Ltd. | A β-PP sample was stretched to necking at room temperature and the morphologies of the deformed material over the necking region were examined with SEM and TEM. Before yielding, the strain was mainly accommodated between horizontal lamellae. Nevertheless, some vertical lamellae were stretched to break when the material approached yielding. At the yield point, many melt spots and deformation bands across vertical lamellae emerged. Some vertical lamellae became highly stretched and their thickness reduced significantly while the neighboring horizontal lamellae rotated towards the loading direction. At the upper shoulder of neck, the melt spots near the poles of spherulites enlarged and elongated in the stress direction, meanwhile, strain-induced crystals appeared in the melt spots. Furthermore, many vertical lamellae were broken into short fragments and some horizontal lamellae were sheared in the loading when the adjacent vertical lamellae were stretched heavily. In the tapered section of the neck, the original β-spherulites were shattered due to excessive crazing and deformation bands and some highly drawn material domains were formed. In turn, more shear bands were generated roughly along the loading direction. The horizontal lamella fragments rotated towards the loading direction and fed into the material flow continually. Finally, the lamella-spherulite structure was converted into an oriented fibril structure in the cold drawn material. Based on the observed results the deformation mechanisms of necking and cold drawing were discussed.
Persistent Identifierhttp://hdl.handle.net/10722/156519
ISSN
2015 Impact Factor: 3.586
2015 SCImago Journal Rankings: 1.188
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, JXen_US
dc.contributor.authorCheung, WLen_US
dc.contributor.authorChan, CMen_US
dc.date.accessioned2012-08-08T08:42:47Z-
dc.date.available2012-08-08T08:42:47Z-
dc.date.issued1999en_US
dc.identifier.citationPolymer, 1999, v. 40 n. 13, p. 3641-3656en_US
dc.identifier.issn0032-3861en_US
dc.identifier.urihttp://hdl.handle.net/10722/156519-
dc.description.abstractA β-PP sample was stretched to necking at room temperature and the morphologies of the deformed material over the necking region were examined with SEM and TEM. Before yielding, the strain was mainly accommodated between horizontal lamellae. Nevertheless, some vertical lamellae were stretched to break when the material approached yielding. At the yield point, many melt spots and deformation bands across vertical lamellae emerged. Some vertical lamellae became highly stretched and their thickness reduced significantly while the neighboring horizontal lamellae rotated towards the loading direction. At the upper shoulder of neck, the melt spots near the poles of spherulites enlarged and elongated in the stress direction, meanwhile, strain-induced crystals appeared in the melt spots. Furthermore, many vertical lamellae were broken into short fragments and some horizontal lamellae were sheared in the loading direction when the adjacent vertical lamellae were stretched heavily. In the tapered section of the neck, the original β-spherulites were shattered due to excessive crazing and deformation bands and some highly drawn material domains were formed. In turn, more shear bands were generated roughly along the loading direction. The horizontal lamella fragments rotated towards the loading direction and fed into the material flow continually. Finally, the lamella-spherulite structure was converted into an oriented fibril structure in the cold drawn material. Based on the observed results the deformation mechanisms of necking and cold drawing were discussed. (C) 1999 Elsevier Science Ltd. | A β-PP sample was stretched to necking at room temperature and the morphologies of the deformed material over the necking region were examined with SEM and TEM. Before yielding, the strain was mainly accommodated between horizontal lamellae. Nevertheless, some vertical lamellae were stretched to break when the material approached yielding. At the yield point, many melt spots and deformation bands across vertical lamellae emerged. Some vertical lamellae became highly stretched and their thickness reduced significantly while the neighboring horizontal lamellae rotated towards the loading direction. At the upper shoulder of neck, the melt spots near the poles of spherulites enlarged and elongated in the stress direction, meanwhile, strain-induced crystals appeared in the melt spots. Furthermore, many vertical lamellae were broken into short fragments and some horizontal lamellae were sheared in the loading when the adjacent vertical lamellae were stretched heavily. In the tapered section of the neck, the original β-spherulites were shattered due to excessive crazing and deformation bands and some highly drawn material domains were formed. In turn, more shear bands were generated roughly along the loading direction. The horizontal lamella fragments rotated towards the loading direction and fed into the material flow continually. Finally, the lamella-spherulite structure was converted into an oriented fibril structure in the cold drawn material. Based on the observed results the deformation mechanisms of necking and cold drawing were discussed.en_US
dc.languageengen_US
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/polymeren_US
dc.relation.ispartofPolymeren_US
dc.rightsPolymer. Copyright © Elsevier Ltd.-
dc.subjectΒ-Polypropyleneen_US
dc.subjectDeformation Mechanismen_US
dc.subjectNecking And Cold Drawingen_US
dc.titleOn deformation mechanisms of β-polypropylene 3. Lamella structures after necking and cold drawingen_US
dc.typeArticleen_US
dc.identifier.emailCheung, WL:wlcheung@hkucc.hku.hken_US
dc.identifier.authorityCheung, WL=rp00103en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0032-3861(98)00578-3en_US
dc.identifier.scopuseid_2-s2.0-0033152301en_US
dc.identifier.hkuros48957-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033152301&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume40en_US
dc.identifier.issue13en_US
dc.identifier.spage3641en_US
dc.identifier.epage3656en_US
dc.identifier.isiWOS:000079252300003-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLi, JX=8523399300en_US
dc.identifier.scopusauthoridCheung, WL=7202743084en_US
dc.identifier.scopusauthoridChan, CM=7404813804en_US

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