materials Flashcards

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1
Q

Whats hookes law

A

The extension is proportional to the force applied provided the limit of proportionality is not excedeed.

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2
Q

What is elastic deformation

A

If a material is deformed but can return to its original shape or size once the deforming force/stress has been removed.

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3
Q

What is plastic deformation

A

If a material is deformed by a stress it cannot go back to its original shape and size even afterdeforming stress is removed.

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4
Q

Whats Fracture

A

point at which material will break

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5
Q

What is stress

A

Stress is a measurement of how much pressure a material can withstand without undergoing physical change

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6
Q

formula for

A
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7
Q

what is Tensile strength

A

Tensile strength the amount of stress a material can be put under before it fractures.

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8
Q

what is Yield strength

A

Yield strength is the amount of stress a material can take before it deforms permanently.

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9
Q

what is Strain

A

Strain is a ratio between the original length of the material and the amount it has extended by.

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10
Q

formula for strain

A

Strain = extension/original length

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11
Q

whats young modulus

A

ratio of stress over strain gives us the Young modulus.

how stiff a spring is

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12
Q

formula for young modulus

A

Stress and Strain

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13
Q

define ductile

A

Materials that have a large plastic region (drawn out into wires)

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14
Q

define Brittle

A

Material that distorts very little even when subject to a large stress and does not exhibit plastic deformation.

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15
Q

define polymeric

A

Material made of many smaller molecules bonded together. Exhibit very large strains

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16
Q

define malleable

A

A material that can be hammered or beaten into flat sheets and will show extensive plastic deformation