Topic 5 - Materials Flashcards

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1
Q

Brittle

A

Snaps without stretching or bending when subject to stress.

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2
Q

Density of a substance

A

Mass per unit volume of the substance

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3
Q

Ductile

A

Stretches easily without breaking.

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4
Q

Elastic limit

A

Point beyond which a wire is permanently stretched.

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5
Q

Elasticity

A

Property of a solid that enables it to regain its shape after it has been deformed or distorted.

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6
Q

Hooke’s law

A

The extension of a spring is proportional to the force needed to extend it.

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7
Q

Limit of proportionality

A

The limit beyond which, when a wire or spring is stretched, it’s extension is no longer proportional to the force that stretches it.

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8
Q

Pascal

A

Unit of pressure or stress equal to 1 N/m

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9
Q

Plastic deformation

A

Deformation of a solid beyond it’s elastic limit.

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10
Q

Stiffness constant

A

The force per unit extension needed to extend a wire or a spring.

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11
Q

Strain

A

Extension per unit length of a solid when deformed.

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12
Q

Stress

A

Force per unit area of cross-section in a solid perpendicular to the cross-section.

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13
Q

Ultimate tensile stress

A

Tensile stress needed to break a solid material.

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14
Q

Yield point

A

Point at which the stress in a wire suddenly drops when the wire is subjected to increasing strain.

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15
Q

Young modulus

A

Stress/strain (assuming the limit of proportionality has not been exceeded)

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