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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS

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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS ( tribology-polymeric-coatings-for-aggressive-bearing-applicat )

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sliding experiment, however, it is hard to completely decouple the two terms (interfacial and cohesive) and therefore most of the data available in the literatures generally include a combined effect. Generic scaling approach Two-term interacting model: - Interfacial wear - Cohesive wear Phenomenological approach Origin of wear process model: - Abrasive wear - Adhesive wear - Transfer wear - Chemical wear - Fatigue wear - Fretting wear - Erosion - Delamination wear Material response approach Polymer class model: - Elastomers - Thermosets - Glassy polymers - Semi-crystalline polymers Wear classification for polymers Figure 2.3 Briscoe’s two-term model of polymer interface showing interfacial and cohesive zones (Briscoe and Sinha, 2002). Wear is an avoidable consequence of friction in a sliding contact of polymer surfaces. Wear of polymers is extremely complex process, and thus the explanation of the wear mechanism can be most efficiently given when we follow one of the three systems of classification as shown in Figure 2.3 (Briscoe and Sinha, 2002). It should be noted that, similar to the case of friction, polymer wear is also greatly influenced by the type (elastomer, amorphous, semi-crystalline) of the polymer. Of particular importance are the properties such as the elastic modulus, tensile strength and the percentage 20

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