Gouging

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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 classic literature ?
You've got labour down and gouged it, and now labour's got you down and is gouging you, that's all, and you're squealing.
Instead of gouging it, we've given it a chance to live.
A pretty spectacle, you philanthropists getting the teamsters down and gouging them.
It was a case of getting labour down and gouging it.
You had no hand in the gouging, but you took your whack out of the gouge.
He had finished gouging out a cob, and now he fitted a weed stem to it, loaded it with tobacco, and was pressing a coal to the charge and blowing a cloud of fragrant smoke -- he was in the full bloom of luxurious contentment.
Joe scooped his eyes with his disengaged wrist, as if he were bent on gouging himself, but said not another word.
Though vaguely conscious, he lay without movement while the ice tore by, great cakes of it caroming against the bank, uprooting trees, and gouging out earth by hundreds of tons.
I heard the rushing click of the midship-engine-lever sliding in and out, the low growl of the lift-shunts, and, louder than the yelling winds without, the scream of the bow-rudder gouging into any lull that promised hold for an instant.
Feverish with desire, with aching back and stiffening muscles, with pick and shovel gouging and mauling the soft brown earth, the man toiled up the hill.