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The Thermal Ageing Effect on Viscoplastic Behaviour of High Density Polyethylene (HDPE)

[+] Author Affiliations
Rabah Ferhoum, Meziane Aberkane, Mohand Ould Ouali, Kamel Hachour

Université Mouloud Mammeri de Tizi-Ouzou, Tizi Ouzou, Algeria

Paper No. ESDA2012-82548, pp. 51-56; 6 pages
doi:10.1115/ESDA2012-82548
From:
  • ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 3: Advanced Composite Materials and Processing; Robotics; Information Management and PLM; Design Engineering
  • Nantes, France, July 2–4, 2012
  • Conference Sponsors: International
  • ISBN: 978-0-7918-4486-1
  • Copyright © 2012 by ASME

abstract

The degradation of polymers has a great influence on their characteristics. Two kinds of processes may be distinguished, physical and chemical. Both are strongly linked. The degradation may be for example induced by UV irradiation, thermal ageing, physico-chemical attacks (water, oxygen, etc.), and mechanical stress. To investigate the thermal ageing effect on the large deformation stress-strain behaviour of PE100, tensions tests were conducted on this material samples submitted to a temperature of 90°C during different hold times. These tests show that thermal ageing leads to an increase of the mechanical properties like the Young Modulus, the yield stress and the stress at break. We show in our work, by different investigations techniques like X-rays diffraction, Transform Infrared Spectroscopy (FTIR), that this increase of mechanical properties is not due to a chemical changes but is due to an increase of the rate of the crystallinity commonly designated by the post-crystallization phenomena.

Copyright © 2012 by ASME

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