# Springs & Properties of materials

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• Created by: Sarah
• Created on: 27-01-15 17:56
Limit of proportionality
the point a which behaviour no longer conforms to Hookes Law
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Elastic Limit
the point at which the spring which no longer return to its original shape when the force is removed
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Elasticity
the ability to regain shape after deforming forces are removed
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Elastic potential energy
the energy stored in a body due a load (force) causing deformation
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work done is EQUAL to...
..Elastic potential energy
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EQUATION: Work done =
Force x Distance
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EQUATION: EPE =
1/2kx2
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tensile stress
force per area
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tensile strain
force per unit of area
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EQUATION: strain =
Force / Area
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tensile stress:
extension per unit of length
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EQUATION: stress:
extension / original
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Stiffness
how difficult it is to change the shape/size of material. The greater the stiffness the steeper the gradient
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Strength
ultimate tensile stress of the material before it breaks
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toughness
measure of the energy needed to break a material. Area under a stress/strain curve
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breaking point
the point at which a material breaks under their UTS
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breaking stress
the maximum stress a material can withstand before breaking
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ultimate tensile strength
the maximum stress a material can withstand before breaking
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brittle
a material that breaks and shows so plastic deformation - linear graph - e.g. glass
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example of brittle material
glass
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ductile
a material that undergoes plastic deformation before breaking - drawn into wires - e.g. copper
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example of ductile material
copper
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elastic limit
the point beyond which the material undergoes plastic deformation
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limit of proportionality
the point at which a material no longer conforms to Hooke's Law
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plastic deformation
permanent deformation after the force is removed
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restoring force
the force exerted by the spring in the opposite force to the deforming force
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yield point
the point at which there is a large increase in extension for a small increase in force
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## Other cards in this set

### Card 2

#### Front

the point at which the spring which no longer return to its original shape when the force is removed

Elastic Limit

### Card 3

#### Front

the ability to regain shape after deforming forces are removed

### Card 4

#### Front

the energy stored in a body due a load (force) causing deformation

### Card 5

#### Front

..Elastic potential energy