Estimates of the overall elastic properties in semi-crystalline polymers

Said Ahzi, David M. Parks, Ali S. Argon

Research output: Contribution to journalConference article

Abstract

The crystalline lamellae of semi-crystalline polymers are highly anisotropic. For instance, the stiffness in the chain direction of a polyethylene crystalline lamella is more than an order of magnitude higher than the stiffness in the transverse directions. The use of the classical bounds (lower and upper bounds) leads to far-apart estimates of the effective elastics properties. These bounds account for the composite nature of semi-crystalline polymers only through the volume fractions of each of the two phases, and neglect the microstructural morphology. Based on the consideration of a two-phase composite inclusion (crystalline lamella + amorphous layer) as the basic element constituting semi-crystalline polymers only through the volume fractions of each of the two phases, and neglect the microstructural morphology. Based on the consideration of a two-phase composite inclusion (crystalline lamella + amorphous layer) as the basic element constituting semi-crystalline polymers, were propose new estimates for the effective elastic properties of these materials. These new averaging schemes account for the microstructural morphology and the texture. We apply our proposed models to predict the effective elastic constants of isotropic and oriented polyethylene. Our results are compared to those of other models.

Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
Volume203
Publication statusPublished - 1 Jan 1995
EventProceedings of the 1995 Joint ASME Applied Mechanics and Materials Summer Meeting - Los Angeles, CA, USA
Duration: 28 Jun 199530 Jun 1995

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ASJC Scopus subject areas

  • Mechanical Engineering

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