dent

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dent

1. a toothlike protuberance, esp the tooth of a sprocket or gearwheel
2. Textiles the space between two wires in a loom through which a warp thread is drawn

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 ?
Emerging Techniques for Enhanced Assessment and Analysis of Dents.
Dents typically result from a purely radial displacement of the pipe wall during either construction or from external land movement of the pipe across a hard surface, such as a rock.
Dents differ in how they respond to the effect of moisture because of the endless possibility of different types of damage and the differences in how pores are closed shut by the damage.
But you can tackle these minor dings and dents in a very ' DIY' way.
Le reliquat de lait qui subsiste entre les dents et les levres fermentent au cours de la nuit, devient acides et attaquent les dents.
William Kennewell a perdu toutes ses dents apres avoir bu de six a huit litres de soda par jour pendant trois ans, rapport Adelaide Now.
CUMBRIAN alpaca breeders Jim and Mary Dent earned a top price of 5,200gns at a special sale of stock from their prize-winning Blueberry herd.
Developer Henry Boot Developments has planning in place to develop a Waitrose store on the Dents site.
He became a Dent Wizard franchise-holder in 2007, right at the start of the downturn.
Other than the common practice of combing dents in repairing and maintaining air-conditioners, there does not appear to be published data quantifying effects dents in fins have on performance.
If possible, inspect the vehicle at the incident location to confirm whether any environmental factors such as trees, buildings, or other obstructions could have shielded the vehicle and affected the distribution of the dents.
Technicians can earn 'up to pounds 40,000 a year' removing dents or paint scratches from cars and vans.