The viscoelastic and viscoplastic behavior of low-density polyethylene
Drozdov, AD; Yuan, Q
AbstractThree series of tensile tests with constant cross-head speeds (ranging from 5 to 200 mm/min), tensile relaxation tests (at strains from 0.03 to 0.09) and tensile creep tests (at stresses from 2.0 to 6.0 MPa) are performed on low-density polyethylene at room temperature. Constitutive equations are derived for the time-dependent response of semicrystalline polymers at isothermal deformation with small strains. A polymer is treated as an equivalent heterogeneous network of chains bridged by temporary junctions (entanglements, physical cross-links and lamellar blocks). The network is thought of as an ensemble of meso-regions linked with each other. The viscoelastic behavior of a polymer is modelled as thermally-induced rearrangement of strands (separation of active strands from temporary junctions and merging of dangling strands with the network). The viscoplastic response reflects mutual displacement of meso-domains driven by macro-strains. Stress-strain relations for uniaxial deformation are developed by using the laws of thermodynamics. The governing equations involve five material constants that are found by fitting the observations. Fair agreement is demonstrated between the experimental data and the results of numerical simulation. It is shown that observations in conventional creep tests reflect not only the viscoelastic, but also the viscoplastic behavior of an ensemble of meso-regions. (C) 2003 Elsevier Science Ltd. All rights reserved.
KeywordSemicrystalline Polymers Low-density Polyethylene Viscoelasticity Viscoplasticity
Indexed BySCI
WOS IDWOS:000182289800001
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Cited Times:26[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorDrozdov, AD
Affiliation1.W Virginia Univ, Dept Chem Engn, Morgantown, WV 26506 USA
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
3.Univ Aalborg, Aalborg, Denmark
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GB/T 7714
Drozdov, AD,Yuan, Q. The viscoelastic and viscoplastic behavior of low-density polyethylene[J]. INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES,2003,40(10):2321-2342.
APA Drozdov, AD,&Yuan, Q.(2003).The viscoelastic and viscoplastic behavior of low-density polyethylene.INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES,40(10),2321-2342.
MLA Drozdov, AD,et al."The viscoelastic and viscoplastic behavior of low-density polyethylene".INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 40.10(2003):2321-2342.
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