Failure Mechanism of Polytetrafluoroethylene Under Friction Fatigue
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TECHNICAL ARTICLE—PEER-REVIEWED
Failure Mechanism of Polytetrafluoroethylene Under Friction Fatigue Quazi Md. Zobaer Shah . Mohammad Asaduzzaman Chowdhury . Md. Arefin Kowser
Submitted: 27 August 2018 / in revised form: 4 January 2019 Ó ASM International 2019
Abstract Being a semicrystalline polymer, polytetrafluoroethylene (PTFE) has been used in sophisticated applications as biological implants where mechanical properties like low coefficient of friction, resistance to corrosion, and biocompatibility are the major concerns. However, these substitutes should own longevity for continuous working against cyclic loading conditions. In this study, friction effect on the fatigue life of PTFE has been observed through experimental and numerical analysis. Asymptotic behavior of penetration depth relation with fatigue life suggests consideration on friction fatigue. Conditional load application on rotating specimen showed that, while being used as substrate under cyclic loading, shape optimization should be considered as design factor. Keywords
Fatigue Bending Fracture ANSYS
Introduction Fatigue alludes to the basic damage, which comes about because of repeated or varying stresses that are below the static yield strength of the material. Fretting is a sort of wear due to relative movement of the mating surfaces. Fretting fatigue is a consolidated marvel of fretting wear and fatigue stacking, where the contact pressure bringing on fretting wear in a general sense diminishes the fatigue life.
Q. Md. Zobaer Shah (&) M. Asaduzzaman Chowdhury Md. Arefin Kowser Dhaka University of Engineering & Technology, DUET, Gazipur, Dhaka 1707, Bangladesh e-mail: [email protected]
Polytetrafluoroethylene, PTFE, for the most part known as a fluorocarbon solid Teflon, is a high-atomic weight compound comprising just carbon and fluorine. PTFE holds some measure of flexibility at 4 K and in a few circumstances is utilized as a part of uses at 540 °C. It is insoluble in every basic solvent and is impervious to all acidic materials. PTFE has, among the most astounding resistivity of any material, a high dielectric strength. The coefficient of friction of PTFE comparing to other materials is to a great degree low, and when sintered with wear lessening exacerbates, a modernly critical class of bearing materials is shaped. Coupled to its low coefficient of friction and synthetic stability, PTFE is practically inconceivable for different materials to stick to. This property is frequently utilized as a part of modern handling innovation where simplicity of cleaning is essential. One part of PTFE that has kept it away from broader modern and technical use is its high melt viscosity (1011 P at 380 °C). This keeps injection and blow forming from being conceivable, and just costly sintering and extrusion fabricating forms are accessible for part fabrication. That paper concentrates on standard material portrayal and the compressive reaction of the pedigreed PTFE materials at varying strain rates and temperatures. Next to no past research
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