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

Bosi, F. and Pellegrino, S. (2017) Molecular based temperature and strain rate dependent yield criterion for anisotropic elastomeric thin films. Polymer, 125 . pp. 144-153. ISSN 0032-3861. https://resolver.caltech.edu/CaltechAUTHORS:20170818-092431386

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.polymer.2017.07.080DOIArticle
http://www.sciencedirect.com/science/article/pii/S0032386117307553?via%3DihubPublisherArticle
ORCID:
AuthorORCID
Pellegrino, S.0000-0001-9373-3278
Additional Information:© 2017 Elsevier Ltd. Received 27 March 2017, Revised 21 July 2017, Accepted 30 July 2017, Available online 3 August 2017.
Group:GALCIT
Subject Keywords:Yield stress; Cooperative model; Semi-crystalline polymers
Record Number:CaltechAUTHORS:20170818-092431386
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170818-092431386
Official Citation:F. Bosi, S. Pellegrino, Molecular based temperature and strain rate dependent yield criterion for anisotropic elastomeric thin films, Polymer, Volume 125, 8 September 2017, Pages 144-153, ISSN 0032-3861, https://doi.org/10.1016/j.polymer.2017.07.080. (http://www.sciencedirect.com/science/article/pii/S0032386117307553)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80606
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Aug 2017 17:06
Last Modified:03 Oct 2019 18:33

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