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Molecular based temperature and strain rate dependent yield criterion for anisotropic elastomeric thin films

Bosi, F; Pellegrino, S; (2017) Molecular based temperature and strain rate dependent yield criterion for anisotropic elastomeric thin films. Polymer , 125 pp. 144-153. 10.1016/j.polymer.2017.07.080. Green open access

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Abstract

A molecular formulation of the onset of plasticity is proposed to assess temperature and strain rate effects in anisotropic semi-crystalline rubbery films. The presented plane stress criterion is based on the strain rate-temperature superposition principle and the cooperative theory of yielding, where some parameters are assumed to be material constants, while others are considered to depend on specific modes of deformation. An orthotropic yield function is developed for a linear low density polyethylene thin film. Uniaxial and biaxial inflation experiments were carried out to determine the yield stress of the membrane via a strain recovery method. It is shown that the 3% offset method predicts the uniaxial elastoplastic transition with good accuracy. Both the tensile yield points along the two principal directions of the film and the biaxial yield stresses are found to obey the superposition principle. The proposed yield criterion is compared against experimental measurements, showing excellent agreement over a wide range of deformation rates and temperatures.

Type: Article
Title: Molecular based temperature and strain rate dependent yield criterion for anisotropic elastomeric thin films
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.polymer.2017.07.080
Publisher version: http://dx.doi.org/10.1016/j.polymer.2017.07.080
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Polymer Science, Yield stress, Cooperative model, Semi-crystalline polymers, AMORPHOUS GLASSY-POLYMERS, PLASTIC-DEFORMATION, SEMICRYSTALLINE POLYMERS, COOPERATIVE MODEL, CREEP-BEHAVIOR, STRESS, POLYETHYLENE, FORMULATION, MORPHOLOGY, PRESSURE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10046499
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