Gouging


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Related to Gouging: back gouging, arc gouging

gouging

[′gau̇j·iŋ]
(engineering)
The removal of material by electrical, mechanical, or manual means for the formation of a groove.

compressor blade damage

compressor blade damageclick for a larger image
Various types of damages that compressor blades can sustain. Only one or two may take place simultaneously though these have been combined in this illustration.
The various types of damages to compressor blades and their appearances are as follows:
i. Bend. The blade gives the appearance of ragged edges. Smooth repair of the edges or surface in question can be carried out, but the extent of the damage that can be repaired is limited.
ii. Bow. The main source of this type of damage is a foreign object. The blade is bent at the tips and the edges.
iii. Burning. The damage is caused by overheating. The surface of the blade is discolored. If the overheating is severe, there may be some flow of material as well.
iv. Burr. A ragged or turn-out edge is indicative of this type of damage. This takes place during the grinding or cutting operation of the blade at the manufacturing stage.
v. Corrosion. Oxidants and corrosive agents, especially moisture present in the atmosphere, are the main reasons for the corrosion or pitting of the blades. Normally, regular washing is sufficient to prevent it. The blade gives a pitted appearance, and there is some breakdown of the surface of the blade. Also called pitting.
vi. Cracks. Excessive stress from shocks, overloading, or faulty processing of blades during manufacturing can cause cracks and result in their fracture.
vii. Dent. These can be caused by FOD (foreign-object damage) or strikes by dull objects like those in bird strikes. Minor dents can be repaired.
viii. Gall. This type of damage is from the severe rubbing of blades, in which a transfer of metal from one surface to another takes place.
ix. Gouging. The blade gives the appearance of displacing material from its surface, and a tearing effect is prominently visible. This type of damage is from the presence of a comparatively large cutting material or foreign body between moving parts.
x. Growth. The damage manifests itself in the form of elongation of the blades. Growth type of damage takes place because of continued and/or excessive heat and centrifugal force.
xi. Score. Deep scratches are indicative of scoring, which is caused by the presence of chips between surfaces.
xii. Scratch. Narrow and shallow scratches are caused by sand or fine foreign particles as well as by mishandling the blades.
xiii. Pitting. Pitting takes place because of atmospheric corrosion, especially seawater. The surface of the blade shows signs of pitting.
References in periodicals archive ?
The importance of being clear on what is meant by our "neighbors" when considering "price gouging" is discussed next.
Watching for price gouging, however, is a waste of everyone's time.
This Note will first discuss the origin and meaning of "price gouging" and the impetus for states to enact anti-gouging legislation.
The price gouging laws of Tennessee and North Carolina, and those of the 30 or so other states with similar laws on the books, are something of a puzzle for economists.
But with Italy's star player Sergio Parisse also receiving just eight weeks for gouging against New Zealand during the same week, the International Rugby Board announced it would review the sanction structure for this type of offence.
Viadana said if there had been gouging then the player concerned deserved to be punished.
The Frenchman had been cited for gouging flanker Stephen Ferris's eyes in an ill-tempered game won 23-13 by Ulster at Ravenhill, Belfast.
He has stunned the nation by having to pull out of the Little 'Ern Trophy, the annual eye gouging competition against bitter rivals Upper Gornal.
Not seeing eye to eye "I find it an absolute disgrace that a coach of a national team can make comments as he did about gouging being part of the game," was the forthright verdict of Lions centre Brian O'Driscoll after last weekend's controversial second Test.
South Africa coach Peter de Villiers crossed that line and kept charging after the gouging incident involving flanker Schalk Burger in the opening seconds of the Second Test against the Lions.
British and Irish Lions centre Brian O'Driscoll and assistant coach Graham Rowntree expressed outrage over comments by Springbok coach Peter de Villiers on Schalk Burger's ban for eye gouging.
But the game was marred by a potential gouging incident which could rule Alan Quinlan out of the Lions Tour.