Topic 4.1: Properties of materials Flashcards

1
Q

physical properties of materials

A

measurable properties that describes the state of materials, e.g. weight, mass, volume, density. can be identified through non destructive testing

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2
Q

Mass

A

relates to the amount of matter that is contained in a specific material. measured in kg (different from weight)

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3
Q

weight

A

a measure of force, unit: newtons

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4
Q

volume

A

the quantity of 3 dimensional space enclosed by a boundary

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5
Q

density

A

mass per unit volume of material

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6
Q

electrical resistivity

A

the measure of a material’s ability to conduct electricity. low resistivity = a good electrical conductor

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7
Q

Thermal conductivity

A

the measure of how fast heat is conducted through a slab of material with a given temperature difference across the slab

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8
Q

thermal expansion

A
  • the measure of the degree of increase in dimensions when an object/material is heated.
  • increases in volume, area, or length.
  • expansivity is measured in fractional increase in dimensions per kelvin increase in temperature
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9
Q

hardness

A

resistance of a material to scratching or penetration

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10
Q

Mechanical properties

A

involvesthe relationship between stress and strain or a reaction to an applied force

measure through some form of destructive testing
* Tensile strength
* compressive strength
* Stiffness
* toughness
* ductility
* elasticity
* plasticity

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11
Q

material selection chart

A

chart used to select appropiate material based on desired properties

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12
Q

smart materials

A

have been designed to have 1 or + properties that can be modified when subject to an external stimuli in a way that the output can be controlled (they are reactive)

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13
Q

piezoelectricity

A

ability to release an electric charge when deformed

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14
Q

shape memory

A

pseudo-elastic property that allows their body to return to its original shape after deforming

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15
Q

photochromicity

A

ability to change color when exposed to light

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16
Q

Magneto-rheostatic

A

fluids that change their viscosity when magnetic force is applied

17
Q

electro-rheostatic

A

fluids that change their viscosity when exposedto an electric field

18
Q

Thermo-electricity

A

the ability of a material to produce an electric current when heated. the material is composed of 2 different conductors