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Aviation > Metallurgy > Flashcards

Metallurgy Flashcards

1
Q

Doesn’t have a bone type structure and relies on the strength of its skin to carry the stress

A

Monocoque

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2
Q

Has bone-type structure
primarily made of heat-treated aluminum, heavier internal parts and thicker skin to carry loads, it is the preferred method of constructing an all-aluminum fuselage, and has stringers

A

Semi-monocoque

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3
Q

Has vertical members

  • Used in old aircrafts
  • wood/metal structure
  • Difficult to streamline
  • Box with tubular longerons + vertical members
A

Pratt Truss

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4
Q

Doesn’t have vertical members

  • Longerons + Diagonal members
  • force transfers to other structures
  • Capable to carry tension + compression
  • Reduces amount of web works
  • more space, strength and rigidity
  • Better streamline
A

Warren Truss

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5
Q

This is very light and adequate for rubber tension and flight loads but unsupported lengths of longeron between nodes make it difficult to handle without breaking

A

Warren Truss Fuselage

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6
Q

This is heavier but the verticals and nodes make it easier to handle without breaking the unsupported lengths of longeron

A

Modified Pratt Truss fuselage

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7
Q

Ability of that material to resist stress without breaking

A

Strength

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8
Q

is that point at which a load would cause an initial indication of permanent distortion. It is measured in PSI

A

Yield Strength

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9
Q

is that point at which a material would fail under a shear force. Also measured in PSI

A

Shear strength

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10
Q

is the ability of a material to resist the forces that tend to damage it at the point of an applied load

A

Bearing Strength

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11
Q

The relationship between the strength of a material and its weight per cubic inch, expressed as a ration is known as

A

Strength - to weight ratio

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12
Q

Ability of a metal to resist abrasion, penetration, cutting action or permanent distortion
may also increase by cold-working the metal and in the case of steel and certain aluminum alloy, by heat treatment

A

Hardness

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13
Q

These two properties are closely associated properties of metal

A

Hardness and strength

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14
Q

Extent which it can be hammered, rolled or pressed into various shapes without cracking, breaking, or having detrimental effects.
- Necessary property in sheet metal that is working into curved shapes such as cowlings, fairings and wingtips

A

Mallebility

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15
Q

This specific material is a great example of malleable material

A

Copper

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16
Q

property of a metal which permits it to be permanently drawn, bent, or twisted into various shapes without breaking

A

Ductility

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17
Q

Similar to malleability

  • Essential for metals used in making wires and tubing
  • Ductile metals are greatly preferred for aircraft use because of their forming ease and resistance to failure under shock loads
  • Aluminum alloys are used for cowl rings, fuselage, wing skin, formed or extruded parts such as ribs, spars or bulkheads
  • chromium molybdenum steel is also easily formed into desired shapes
A

Ductility

18
Q

property of a metal which allows little bending or deformation without shattering, - Brittle metals apt to break or crack without change of shape
- Because structural metals are often subjected to shock loads, brittleness is not a very desirable property

A

Brittleness

19
Q

Cast iron, aluminum and very hard steel and are great example of…?

A

Brittleness

20
Q

ability of a metal to transmit heat or electricity

A

Conductivity

21
Q

ability of a metal to freely accept and release electrons where an electrical current is applied

A

Electrical conductivity

22
Q

This helps eliminate radio interference in aircrafts and must be considered

A

Electrical conductivity

23
Q

enables a metal to return to its original shape, when force which causes the change of shape is removed

A

Elasticity

24
Q

each metal has a point known as elastic limit beyond which it cannot be loaded without causing permanent distortion

A

Elastic limit

25
Q

Spring steel is a great example of this…?

A

Elastic Limit

26
Q

withstand tearing or shearing and may be stretched or otherwise deformed without breaking

A

Toughness

27
Q

This property is extremely desirable in aircraft metals

A

Toughness

28
Q

ability of a metal to become liquid by the application of heat

A

Fusibility

29
Q

Welding is an example of this term

A

Fusibility

30
Q

Steel fuses around X Degrees Fahrenheit

A

2600

31
Q

Aluminum alloys will fuse approximately around X degrees Farenheit

A

1250

32
Q

mass of a unity volume of a material is called

A

Density

33
Q

This is critical when choosing a material to be used in the design of a part, so that the proper weight and balance of the aircraft can be maintained

A

Density

34
Q

Groups of metals having iron as their principle element is considered?

A

Ferrous metals

35
Q

When combined with limestone and melted down, this can be converted into what is commonly known as

A

Pig Iron

36
Q

Carbon added to pig iron up to approx. 1%, the product is vastly superior to iron alone and is classified as

A

Carbon steel

37
Q

A base metal (such as steel) to which small quantities of other metals have been added is called an

A

Alloy

38
Q

This steel element varies between 0.06% to 1.25% and is called what?

A

Carbon Steel

39
Q

Steels of this grade are used for making items such as, safety wire, certain nuts, cable bushings or threaded rod ends

A

Low Carbon Steel

40
Q

This is adaptable for machining or forging

A

Medium-Carbon Steel

41
Q

In the fully heat-treated condition, it is very hard, will withstand high shear and wear, and will have minimal deformation and has limited use in aircrafts

A

High-Carbon steel

Aviation (1 decks)

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