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m6 > 6.0- General > Flashcards

6.0- General Flashcards

1
Q

Give the definition for Hardness.

A

Resist penetration, wear or cutting action.

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2
Q

Give the definition for Strength.

A

Resist stress without breaking.

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3
Q

Give the definition for Elasticity.

A

Return to original size and shape after deformation.

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4
Q

Give the definition for Plasticity.

A

Property that allows it to be reshaped.

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5
Q

Give the definition for Ductility.

A

Drawn into thinner sections without breaking.

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6
Q

Give the definition for Malleability.

A

Stretched or shaped without breaking.

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7
Q

Give the definition for Toughness.

A

Deformed without breaking.

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8
Q

Give the definition for Brittleness.

A

To deform or break when stress and force is applied.

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9
Q

What is stress defined as?

A

Force per unit area.

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10
Q

What are the SI units for stress?

A

N/M² or Pascals.

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11
Q

What is the Imperial measure for stress?

A

psi

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12
Q

Give the definition for Tensile stress.

A

To stretch.

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13
Q

Give the definition for Compressive stress.

A

To squish.

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14
Q

Give the definition for Shear stress.

A

To break.

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15
Q

What are the Combined Stresses. (2 combinations)

A

1) Tensile+ shearing

2) Compressive+ shearing.

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16
Q

What is Simple stress?

A

Just one of the stresses acting.

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17
Q

What is Unit strain?

A

Deformation of shape due to application of load divided by original dimension.

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18
Q

What is Poissons ratio?

A

Ratio of lateral to longitudinal strain to a material when subject to uniform longitudinal stress. E.g. when you stretch it how much thinner does it become.

19
Q

What is the poisson ratio values for steel?

A

0.30

20
Q

What is the poisson ratio values for wrought iron?

A

0.28

21
Q

What is the poisson ratio values for cast iron?

A

0.27

22
Q

What is the poisson ratio values for brass?

A

0.34

23
Q

Give the definition for metallic.

A

Contains metal or metal alloys.

24
Q

Give the definition for ferrous.

A

Contains iron.

25
Q

Give the definition for elastic limit.

A

Item can return to its original shape after acting force is removed.

26
Q

What is the elastic limit of steel also known as?

A

The proportional limit.

27
Q

Give the definition for yield strength?

A

Maximum stress that can be applied without permanent deformation.

28
Q

Give the definition for ultimate tensile strength?

A

Maximum stress that can be applied without breaking.

29
Q

What is the modulus of elasticity?

A

Ratio of stress to strain within the proportional limit of material in tension or compression.

30
Q

In a phase diagram what are the axis always labelled as?

A

y- temp

x- percentage of alloy.

31
Q

For airframes what density of metal is normally used?

A

Below 5 Kg/dm³.

32
Q

What are the three most important metals in aircraft structure?

A

1) Aluminium and alloys
2) Titanium and alloys
3) Magnesium and alloys

33
Q

What is the density of aluminium?

A

2.7Kg/dm³.

34
Q

What is the density of titanium?

A

4.5Kg/dm³.

35
Q

What is the density of magnesium?

A

1.74Kg/dm³.

36
Q

Where can metal densities between 7.85 and 9.5 Kg/dm³ be used?

A

Aircraft structure where high weights or higher strengths are needed.

37
Q

What is the definition of a crystal?

A

A rigid body where all particles form in a repeating pattern.

38
Q

How many atoms does Body centred cubic have (BCC)?

A

9

39
Q

How many atoms does a face centred cubic have (FCC)?

A

14

40
Q

What metals are examples of FCC? (6 examples)

A

Aluminium, copper, gold, nickel, silver and iron.

41
Q

What metal is a bcc below 910°c and fcc above 910°c?

A

Iron.

42
Q

How many atoms in hexagonal close packed (HCP)?

A

17.

43
Q

What metals are HCP? (4 examples)

A

Cobalt, magnesium, titanium, zinc

44
Q

What are the different characteristics considered in material selection?

A

Quality, cost, maintenance, repair

m6 (14 decks)

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