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Materials > Mechanical Properties > Flashcards

Mechanical Properties Flashcards

1
Q

What is engineering stress?

A

Force/original area

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2
Q

What is true stress?

A

Force/area at that point

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3
Q

What is tensile strength?

A

(Ultimate Tensile Strength) The maximum stress on a stress-strain cure

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4
Q

Describe elastic deformation

A

It will return to its original shape

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5
Q

Describe plastic deformation

A

Won’t return to its original length (permanently deformed)

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6
Q

What is Young’s modulus?

A

Stress/strain (gradient of the stress-strain curve

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7
Q

What is Hooke’s law?

A

Stress is proportional to strain

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8
Q

What is yield strength?

A

The stress required to produce a small amount of plastic deformation (strength related to a permanent strain of 0.1%)

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9
Q

Brittle material

A

Will only deform elastically

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10
Q

Ductile material

A

Will deform elastically and plastically

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11
Q

Necking

A

Happens after UTS, void forms inside the neck, the void then propagates causing the material to fail and produce a fracture

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12
Q

What is poisson’s ratio?

A

-strain lateral/ strain longitudinal

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13
Q

What is tensile stress?

A

Perpendicular force / area

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14
Q

What is shear stress?

A

Parallel force / area

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15
Q

What is toughness?

A

The energy a material can absorb before it breaks (area under stress-strain curve)

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16
Q

Describe the Charpy and Izod impact test?

A

Initial height is measured, the hammer swings and the final height is measured, the difference in potential energy is the energy absorbed

17
Q

What is hardness?

A

Ability of a material to resist scratching, surface indentation and plastic deformation

18
Q

Describe the Brinell hardness test

A

Ball is pressed into the surface of the material, the hardness is then calculated using force/ surface area of impression

19
Q

What is specific gravity?

A

Density of material / density of water

Materials (6 decks)

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