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Failure Mechanism and Long-Term Hydrostatic Behavior of Linear Low Density Polyethylene Tubing  

Weon, Jong-Il (Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology)
Chung, Yu-Kyoung (Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology)
Shin, Sei-Moon (Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology)
Choi, Kil-Yeong (Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology)
Publication Information
Polymer(Korea) / v.32, no.5, 2008 , pp. 440-445 More about this Journal
Abstract
The failure mechanism and failure morphology of linear low density polyethylene (LLDPE) tubing under hydrostatic pressure were investigated. Microscopic observations using video microscope and scanning electron microscope indicate that the failure mode is a brittle fracture including cracks propagated from inner wall to outer wall. In addition, oxidation induction time and Fourier transform infrared spectroscopy results show the presence of exothermic peak and the increase in carbonyl index on the surface of fractured LLDPE tubing, due to thermal-degradation. An accelerated life test methodology and testing system for LLDPE tubing are developed using the relationship between stresses and life characteristics by means of thermal acceleration. Statistical approaches using the Arrhenius model and Weibull distribution are implemented to estimate the long-term life time of LLDPE tubing under hydrostatic pressure. Consequently, the long-term life time of LLDPE tubing at the operating temperature of $25^{\circ}C$ could be predicted and also be analyzed.
Keywords
failure mechanism; linear low density polyethylene; degradation; oxidation induction time; accelerated life-time;
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