Wear

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Wear

(wēr), river, c.65 mi (100 km) long, rising in the Pennines in County Durham, NE England, and flowing to the North Sea at Sunderland. Navigable for barges to Durham city, the river waters a rich agricultural area. The lower Wear passes through an industrial region.

Wear

 

a change in the dimensions, shape, weight, or surface condition of a product as a result of friction on the surface layer.

The wear of machine parts, members of building structures (such as the steps of stairs), objects, clothing, and other items depends on the conditions of friction, the properties of the material, and the design of the product. Wear may be considered as a mechanical process complicated by the action of physical and chemical factors that bring about a decline in the strength of microunits of the surface layer. Depending on the conditions of external influence on the surface layer, a distinction is made between abrasive, cavitational, erosive, and other types of wear. Wear leads to a deterioration of the functional qualities of products and to the loss of their use value. Both the use of materials with high wear resistance and design concepts that assure compensation for wear, reserve durability, and so on and general reduction of friction-use of high-quality lubricant and protection from abrasion-increase resistance.

REFERENCES

Khrushchov, M. M., and M. A. Babichev. Issledovaniia iznashivaniia metallov. Moscow, 1960.
Kragel’skii, I. V. Trenie i iznos. Moscow, 1968.
Tenenbaum, M. M. Iznosostoikost’konstruktsionnykh materialovidetalei mashin pri abrazivnom iznashivanii. Moscow, 1966.

M. M. TENENBAUM


Wear

 

the gradual loss of value (including use-value) of fixed capital stock during use caused by natural forces and extraordinary circumstances (fires, floods). Wear manifests itself in mechanical wear, corrosion, metal fatigue, deformation, and the failure of structures. The greater the wear on productive assets, the shorter will be their service life and undepreciated value. At the same time, as wear occurs during production, the value of the fixed capital stock is gradually transferred to the finished goods; the value transferred takes the form of amortization deductions. These deductions in turn are used for the modernization and/or replacement of the assets.

Wear can be minimized through timely maintenance and repair. Of particular importance is capital repair, wherein worn parts of machines and other objects are replaced with new ones, thereby preventing an excessive increase in wear. Thus, while some types of wear can be avoided, others are a normal part of operation and their prevention through capital repair is economically unjustified.

wear

[wer]
(engineering)
Deterioration of a surface due to material removal caused by relative motion between it and another part.

Wear

The removal of material from a solid surface as a result of sliding action. It constitutes the main reason why the artifacts of society (automobiles, washing machines, tape recorders, cameras, clothing) become useless and have to be replaced. There are a few uses of the wear phenomenon, but in the great majority of cases wear is a nuisance, and a tremendous expenditure of human and material resources is required to overcome the effects.

Adhesive wear is the only universal form of wear, and in many sliding systems it is also the most important. It arises from the fact that, during sliding, regions of adhesive bonding, called junctions, form between the sliding surfaces. If one of these junctions does not break along its original interface, then a chunk from one of the sliding surfaces will have been transferred to the other surface. In this way, an adhesive wear particle will have been formed. Initially adhering to the other surface, adhesive particles soon become loose and can disappear from the sliding system. See Friction

Abrasive wear is produced by a hard, sharp surface sliding against a softer one and digging out a groove. The abrasive agent may be one of the surfaces (such as a file), or it may be a third component (such as sand particles in a bearing abrading material from each surface). Abrasive wear coefficients are large compared to adhesive ones. Thus, the introduction of abrasive particles into a sliding system can greatly increase the wear rate; automobiles, for example, have air and oil filters to catch abrasive particles before they can produce damage.

Corrosive wear arises when a sliding surface is in a corrosive environment, and the sliding action continuously removes the protective corrosion product, thus exposing fresh surface to further corrosive attack. See Corrosion

Surface fatigue wear occurs as result of the formation and growth of cracks. It is the main form of wear of rolling devices such as ball bearings, wheels on rails, and gears. During continued rolling, a crack forms at or just below the surface and gradually grows until a large particle is lifted right out of the surface.

Most manifestations of wear are highly objectionable, but the phenomenon does have a few uses. Thus, a number of systems for recording information (pencil and paper, chalk and blackboard) operate via a wear mechanism. Some methods of preparing solid surfaces (filling, sandpapering, sandblasting) also make use of wear. See Abrasive

Wear

a river in NE England, rising in NW Durham and flowing southeast then northeast to the North Sea at Sunderland. Length: 105 km (65 miles)
References in periodicals archive ?
I think that is unrealistic, but the point is important because assets must earn a return sufficient to keep them in use, or they will wear away, and the business entity then experiences financial problems.
show that even one heavy rainfall contains enough acid to wear away a few microns of the highly polished marble surface.
Fitch expects delinquencies, particularly in the multifamily and office sectors, to continue to rise during 2004, but is optimistic that modest positive absorption in the office sector will continue to wear away the oversupply, and the small gains being noted in interest rates will help stabilize the population of apartment renters.
Emma, of Cumnock, Ayrshire, will have spare potatoes on hand in case they wear away on the four-hour journey or roll off the bridge.
It takes a long time for plastic, latex, and wax to wear away," said Wrigley's Christopher Perille.
On the other hand, if the black layer starts to wear away faster than it forms at the underlying copper surface, Baboian says, "then we would see a drastic reduction in the thickness of the black, color changes and an increased corrosion rate.
Other systems feature a source with an inert coating, which can wear away over time from routine cleaning and operation.
But the SFA - who have ordered both sides to wear away kits - have given the go-ahead for the winners to change back into their traditional home shirts for the trophy presentation.
the minute that granite is exposed on Earth's surface, it begins to wear away.