Metal Deformation: Fatigue, Hardness & Creep Flashcards

1
Q

What is metal fatigue?

A

Metal fatigue is failure due to on/off loading or cyclic stressing.

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2
Q

What does metal fatigue begin as?

A

It begins as a small crack which grows under action of fluctuating stress.

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3
Q

What is metal hardness?

A

Hardness is the property of the material which enables it to resist plastic deformation, usually penetration or by indentation.

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4
Q

What is hardness also referred to as?

A

It is also referred to as temper or the resistance to bending, scratching or abrasion.

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5
Q

What is metal creep?

A

Creep is the slow deformation of a material over time resulting from a constant force acting on the material.

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6
Q

What does metal creep occur as a result of?

A

Metal creep occurs as a result of long term exposure to high levels of stress that are below the yield strength of the material. Temperature and time are contributing factors.

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7
Q

Identify factors that influence creep

A

Creep happens faster at higher temperatures.

An example is a length of lead hung on the wall stretching because of gravity pulling it down.

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8
Q

identify ways to prevent corrosion

A

Galvanising (iron or steel with zinc)
Dip coating
Cathodic protection
Barrier coatings

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