Saturday, June 9, 2012

abrasive and Adhesive Wear

Sonography Degree - abrasive and Adhesive Wear
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Abrasive wear happens when the particular material is being removed from one surface, by an additional one harder material. In results, hard particles of the debris in the middle of the 2 surfaces are formed. The terms scratching, gouging or scoring are used depending on the degree of polisher wear. In uncomplicated words, the harder material scratches the softer material.

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How is abrasive and Adhesive Wear

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There are 2 condition in which polisher wear occurs. The 2 body abrasion and 3 body abrasion. In the former, the harder exterior rubs the other. Examples of these consist of mechanical grinding, cutting and machining. The latter involves a third body. This third body is commonly a small particle of polisher in the middle of the 2 softer rubbing surfaces.

Microscopically, polisher wear causes asperities of the harder exterior to press into the softer surface, with plastic flow of the softer exterior formed colse to the harder asperities. These consequent in 'microploughing' and 'microcracking' where tangential motion is imposed.

This polisher wear can be reduced by applying 'hydrodynamic' or 'elastohydrodynamic' lubricants at discrete film thickness. This separates the surfaces and wash out any contaminant particles in between. Using the accurate coating material and discrete thermally sprayed techniques greatly benefits the resistance to polisher wear.

Adhesive wear is often referred to 'scuffing'. This happens when adhesive junctions that are newly formed lock together and as 2 surfaces slide over each other under pressure. When normal pressure is being applied, local pressure at the asperities come to be very high. Often times, the yield stress is exceeded. Then these asperities deform plastically until the real area of perceive has increased sufficiently to maintain the earlier, applied load.

If no lubricants are used, asperities are to be cold welded together. Otherwise, junctions will shear and form new junctions. This said wear mechanism not only destroys the sliding surfaces, but permits the generation of wear particles. In turn, these wear particles lead to cavitation that can cause component failure.

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