The term wear is used rather looscly in engineering to describe a range of physi
ID: 2073749 • Letter: T
Question
The term wear is used rather looscly in engineering to describe a range of physical degradation processes which are responsible for changes in surface morphology, colour and texture. What wear mechanism is likely to happen in the following scenario and how can one mitigate these degradation processes during the design stage? 1. a. Two metal surfaces sliding at high speed relative to each other and under high contact load. (6 Marks) b. An antifriction metallic bearing to operate at 270'C which is subject to (6 Marks) (6 Marks) vibration and very high thrust loads c. A magnetic bearing rotating at 60,000 rpm. d. The tip of an offshore 3MW turbine blade moving through air at supersonic speeds. (7 Marks)Explanation / Answer
Solution:
a) Two metal surfaces sliding at high speed relative to each other and under high contact load.
Adhesive wear: It is a type of wear mechanism in which the wearing takes place between two surfaces due to simple frictional contact.
b) An antifriction metallic bearing to operate at 270°C which is subject to vibration and very high thrust loads.
Fretting wear: Localized wear of lubricated surfaces due to reciprocating sliding of extremely low amplitude because of vibrations.
c) A magnetic bearing rotating at 60,000 rpm.
Cavitation damage: Removal of material due to cracking and pitting caused by high energy implosions of vacuous cavities in a cavitating fluid.
d) The tip of an offshore 3MW turbine blade moving through air at supersonic speeds.
Erosion wear: Cutting of furrows on a surface by hard particles contained in a fluid travelling at high velocity.
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