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Time-dependent rheological behavior of branched polymer melts in extensional flows ×÷Õß:Wang, W (Wang, Wei)[ 1,2 ] ; Hu, CX (Hu, Changxu)[ 1 ] ; Li, WW (Li, Wenwen)[ 1 ] MECHANICS OF TIME-DEPENDENT MATERIALS ¾í: 20 ÆÚ: 1 Ò³: 123-137 DOI: 10.1007/s11043-015-9287-3 ³ö°æÄê: FEB 2016 ²é¿´ÆÚ¿¯ÐÅÏ¢ MECHANICS OF TIME-DEPENDENT MATERIALS ³ö°æÉÌ SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS ISSN: 1385-2000 eISSN: 1573-2738 Ñо¿ÁìÓò Mechanics Materials Science ÕªÒª The viscoelastic flow of low-density polyethylene melts in a cross-slot channel is studied numerically for the double convected Pom-Pom (DCPP) and single modified DCPP (S-MDCPP) models. The equal low-order finite elements for velocity-pressure-stress variables are implemented to solve the flow fields using the pressure-stabilized iterative fractional step algorithm. The distributions of axial velocity along the channel centerline and the principal stress difference achieved by numerical predictions are in quantitative good agreement with the reported experimental results. Furthermore, the evolution of backbone stretch of macromolecule with flow time is demonstrated, and then an exponential decay function is proposed linking the microscale stretch relaxation time with the macroscale flow time, in order to reveal the stretch relaxation response of the branched polymer. The effects of the Weissenberg number and several constitutive parameters of the S-MDCPP model on the rheological behavior of polymer melts are discussed. ¹Ø¼ü´Ê ×÷Õ߹ؼü´Ê:Numerical simulation; Complex flow; Rheological behavior; Extensional flow; Viscoelastic constitutive models; Polymer melts KeyWords Plus:CROSS-SLOT FLOW; PLANAR CONTRACTION FLOW; POM-POM MODEL; FINITE-ELEMENT-METHOD; CONSTITUTIVE MODELS; NUMERICAL SIMULATIONS; POLYETHYLENE MELT; EQUATIONS; RHEOMETRY; FLUIDS ×÷ÕßÐÅÏ¢ ͨѶ×÷ÕßµØÖ·: Wang, W (ͨѶ×÷Õß) Qingdao Univ Sci & Technol, Minist Educ, Shandong Prov Key Lab Rubber Plast, Key Lab Rubber Plast, Qingdao 266042, Peoples R China. ÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ Qingdao University of Science & Technology ͨѶ×÷ÕßµØÖ·: Wang, W (ͨѶ×÷Õß) Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China. ÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ Dalian University of Technology µØÖ·: [ 1 ] Qingdao Univ Sci & Technol, Minist Educ, Shandong Prov Key Lab Rubber Plast, Key Lab Rubber Plast, Qingdao 266042, Peoples R China ÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ Qingdao University of Science & Technology [ 2 ] Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China ÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ Dalian University of Technology µç×ÓÓʼþµØÖ·:ww@qust.edu.cn »ù½ð×ÊÖúÖÂл »ù½ð×ÊÖú»ú¹¹ ÊÚȨºÅ National Natural Science Foundation of China 21274072 11302043 State Key Laboratory of Structural Analysis for Industrial Equipment GZ1213 Key Laboratory of Rubber-plastics, Ministry of Education KF2010007 ²é¿´»ù½ð×ÊÖúÐÅÏ¢¹Ø±Õ»ù½ð×ÊÖúÐÅÏ¢ The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China through Contract/Grant numbers 21274072, 11302043, and the State Key Laboratory of Structural Analysis for Industrial Equipment (No. GZ1213) and the Key Laboratory of Rubber-plastics, Ministry of Education (No. KF2010007). ³ö°æÉÌ SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS Àà±ð / ·ÖÀà Ñо¿·½Ïò:Mechanics; Materials Science Web of Science Àà±ð:Mechanics; Materials Science, Characterization & Testing ÎÄÏ×ÐÅÏ¢ ÎÄÏ×ÀàÐÍ:Article ÓïÖÖ:English Èë²ØºÅ: WOS:000371303800007 ISSN: 1385-2000 eISSN: 1573-2738 ÆÚ¿¯ÐÅÏ¢ Ŀ¼£º Current Contents Connect® ÆäËûÐÅÏ¢ IDS ºÅ: DF4FQ Web of Science ºËÐĺϼ¯ÖÐµÄ "ÒýÓõIJο¼ÎÄÏ×": 38 Web of Science ºËÐĺϼ¯ÖÐµÄ "±»ÒýƵ´Î": 0 Ó°ÏìÒò×Ó 1.587 1.418 2014 5 Äê JCR® Àà±ð Àà±ðÖеÄÅÅÐò JCR ·ÖÇø MATERIALS SCIENCE, CHARACTERIZATION & TESTING 5/33 Q1 MECHANICS 50/137 Q2 Êý¾ÝÀ´×ÔµÚ 2014 °æ Journal Citation Reports® |
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