Materials Flashcards

1
Q

What is density?

A

Mass per unit volume. The measure of the compactness of a material.

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2
Q

State Hooke’s law.

A

Extension is directly proportional to the force applied, given that environmental conditions are kept constant, and up until the limit of proportionality is reached.

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3
Q

What is the limit of proportionality?

A

The point after which Hooke’s law is no longer obeyed.

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4
Q

What is the elastic limit?

A

A point just after the limit of proportionality. Force applied after this point will deform the material plastically.

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5
Q

What is the spring constant, k?

A

The measure of the stiffness of the spring.

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6
Q

How do we calculate elastic strain energy?

A

Area under a force-extension graph. W=FScosθ

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7
Q

What is breaking stress?

A

The value of stress at which the material will break apart.

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8
Q

Ductile

A

Can undergo a large amount of plastic deformation before fracturing.

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9
Q

Brittle

A

Extends very little, and fractures at a low extension.

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10
Q

Plastic

A

Large amount of extension, especially beyond the elastic limit. Work done is dissipated as heat.

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11
Q

What is the ultimate tensile stress?

A

The highest point on a stress-strain graph, shows the maximum stress the material can withstand.

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