Fatigue Behavior of Engineering Polymers

Document Type : compile

Authors

1 Professor / Polymer Engineering Plastic Department of Iran Polymer & petrochemical Institute

2 amirkabir university-Mahshahr

3 amirkabir university

Abstract

In this paper, the basic definitions of the fatigue behavior of polymeric materials and
the thermal fatigue of polymers, which is due to their viscoelastic properties, are
discussed. Also, the mechanical fatigue of polymers from different aspects and the three
stages mechanism include initiation, propagation and fracture have been discussed. Stress
amplitude against number of cycles to fatigue failure curves are presented, which is one
of the ways to predict the fatigue behavior of polymers. Based on these curves, lifetime
and fatigue resistance are measured. The tests performed to predict the fatigue behavior of
polymers are based on theoretical relationships. According to Paris law, the growth rate of
fatigue cracks is plotted in terms of stress intensity factor, which has a very effective role
in predicting the fatigue behavior of materials. Many factors can affect the fatigue behavior
of polymers, including various experimental and structural variables such as temperature,
geometry, orientation, molecular weight, crosslinking, the presence of reinforcements,
and environmental factors such as solvent and moisture. Due to the sensitive applications
of engineering polymers such as polycarbonate (PC), polyoxymethylene (POM),
polymethyl methacrylate (PMMA), polyamide (PA), polyphenylene oxide (PPO), and
polytetrafluoroethylene (PTFE), fatigue behavior is very important.

Keywords

References

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