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Mod 6 > 6 > Flashcards

6 Flashcards

1
Q

What is density?

A

Mass per unit volume

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2
Q

What is density measured in?

A

Kg/m3

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3
Q

What is fatigue?

A

When something is subjected to cyclic loading

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4
Q

Where does fatigue start?

A

A stress concentrator (scratch or indent)

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5
Q

How is stress defined?

A

Force per unit area

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6
Q

What is stress measured in?

A

N/m2 or pascals

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7
Q

What is tensile stress?

A

When an object is under tension

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8
Q

What is compressive stress?

A

When an object is under compression

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9
Q

What is shearing stress?

A

When an object is under shear

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10
Q

What is combined stress?

A

When an object has a combination of tensile or compressive stress and shearing stress

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11
Q

What is simple stress?

A

When there is only one type of stress acting on an object

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12
Q

What is unit strain?

A

The amount of deformation divided by original shape

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13
Q

What is poissons ratio?

A

When an object is pulled apart it will get thinner and visa verca

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14
Q

What is the definition of hardness?

A

The ability to resist penetration, wear or cutting

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15
Q

What is the definition of strength?

A

The ability to withstand forces which tend to deform the metal

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16
Q

What is the definition of elasticity?

A

The ability to return to its original shape after deformation

17
Q

What is the definition of plasticity?

A

The property of a metal which allows it to be reshaped

18
Q

What is the definition of ductility?

A

The ability for metal to be drawn into thinner sections

19
Q

What is the definition of malleability?

A

The ability to being beaten or rolled without breaking

20
Q

What is the definition of toughness?

A

The ability to be deformed without breaking

21
Q

What is the definition of brittleness?

A

The property of an object to break when deformed

22
Q

What is the definition of conductivity?

A

The ability to transmit heat or electricity

23
Q

What is the definition of durability?

A

The ability to withstand forces over a period of time

24
Q

What is a metallic material?

A

Having the nature of metal or containing metal

25
Q

What is a non-metallic material?

A

Contains no metal

26
Q

What is a ferrous material?

A

Any metal that contains iron

27
Q

What is a non-ferrous metal?

A

A metal that contains little or no iron

28
Q

What is the elastic limit of an object?

A

The maximum stress to a material and still return to original shape

29
Q

What is yield strength of an object?

A

The maximum stress that can be applied without permanent deformation

30
Q

What is the tensile strength of an object?

A

The maximum value of tensile stress that a material can withstand without breaking

31
Q

How is tensile strength calculated?

A

Maximum tensile force divided by original cross-sectional area

32
Q

How many atoms does a body centred cubic unit cell have?

A

9 atoms

33
Q

How many atoms does a face cantered cubic unit cell have?

A

14 atoms

34
Q

How many atoms does a hexagonal close packed unit cell have?

A

17 atoms

35
Q

A change in material in existing programmes will result in?

A

A new airworthiness certification

Mod 6 (17 decks)

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