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A Nonlinear Constitutive Model for High Density Polyethylene at High Temperature
Rajasekaran, Nepolean

2011, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
High density polyethylene (HDPE) is a common polymer material that is widely used in industrial applications. While significant amount of efforts have been devoted to understanding the constitutive behavior of HDPE, very little work has been performed to investigate the material response of HDPE at high strain rate and high temperature. The main objective of this research is to develop a constitutive model to bridge this gap by focusing on the non-linear stress-strain behavior in the high strain rate and high temperature range. A series of monotonic uniaxial compressive tests have been conducted at high temperature (100°C) and high strain rate (1/s) to characterize the HDPE behavior. Based on the experimental results, existing hyperelastic material models such as Mooney-Rivlin, Ogden, Arruda-Boyce, are assessed with the use of ABAQUS (a finite element software). Based on extensive comparisons, a new three-dimensional constitutive model for HDPE has been proposed. The constitutive equation integrates the basic mechanisms proposed by Boyce et al. [6] and Shepherd et al. [8]. The total stress is decomposed into an elastic-viscoplastic representation of the intermolecular resistance acting in parallel with a time and temperature dependent network resistance of polymer chains. Material constants involved in the model were calculated by fitting the compressive test results to the proposed constitutive equations. A constitutive solver for the proposed model has been developed. The stress-strain relation resolved from the constitutive model closely matches the corresponding ones from the experiments.
Dong Qian, PhD (Committee Chair)
Shepherd Shepherd, PhD (Committee Member)
Yijun Liu, PhD (Committee Member)
68 p.

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Rajasekaran, N. (2011). A Nonlinear Constitutive Model for High Density Polyethylene at High Temperature. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Rajasekaran, Nepolean. "A Nonlinear Constitutive Model for High Density Polyethylene at High Temperature." Electronic Thesis or Dissertation. University of Cincinnati, 2011. OhioLINK Electronic Theses and Dissertations Center. 18 Dec 2017.

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Rajasekaran, Nepolean "A Nonlinear Constitutive Model for High Density Polyethylene at High Temperature." Electronic Thesis or Dissertation. University of Cincinnati, 2011. https://etd.ohiolink.edu/

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