18 Questions
What type of damage occurs when a piece of metal or foreign material gets between close moving parts, causing a displacement of metal?
Gouging
What is the term for the loss of metal due to mechanical means, such as using a saw blade or chisel?
Cut
What is the term for a small, rounded depression in a surface caused by a part being struck with a rounded object?
Dent
What is the term for the condition of surface erosion caused by minute movement between two parts clamped together with considerable unit pressure?
Fretting
What is the term for a severe condition of chafing or fretting in which a transfer of metal from one part to another occurs?
Galling
What is the term for a series of blunt depressions in a surface?
Peening
What is corrosion, and what are its effects on metal?
Corrosion is the loss of metal by a chemical or electrochemical action, resulting in the removal of metal, and its products can be easily removed by mechanical means.
What is the difference between burning and burnishing?
Burning is surface damage due to excessive heat, usually caused by improper fit, defective lubrication, or over-temperature operation. Burnishing is the polishing of one surface by sliding contact with a smooth, harder surface, with no displacement or removal of metal.
What is a crack, and what are its common causes?
A crack is a partial separation of material, usually caused by vibration, overloading, internal stresses, defective assembly, or fatigue.
What is chafing, and what is its effect on parts?
Chafing is a condition caused by a rubbing action between two parts under light pressure, resulting in wear.
What is a burr, and how is it usually formed?
A burr is a sharp or roughened projection of metal, usually resulting from machine processing.
What is abrasion, and what is its usual cause?
Abrasian is an area of roughened scratches or marks, usually caused by foreign matter between moving parts or surfaces.
What is the primary cause of pitting in metal surfaces?
Corrosion or minute mechanical chipping of surfaces
What is the difference between scoring and scratching?
Scoring is a series of deep scratches, while scratching is a shallow, thin line or mark
What is erosion, and how does it affect the metal surface?
Erosion is the loss of metal from the surface by mechanical action of foreign objects, resulting in a rough surface with lines in the direction of the foreign material's movement
What is the most likely cause of flaking in metal surfaces?
Defective plating or excessive loading
What is the purpose of step 4 in the engine overhaul process?
Cleaning the main engine components
What type of damage is characterized by a buildup or rolling of metal from one area to another?
Pick up or scuffing
Test your knowledge of various types of material damage, including cuts, dents, and fretting. Identify the differences between these common forms of damage. Learn how to recognize and describe them.
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