Definitions Flashcards
Elastic deformation
A temporary change of shape that occurs when stress is applied. When the stress is removed the object returns to its original shape
Plastic deformation
A permanent change of shape that occurs when stress is applied
Strong
A large stress is needed to cause failure
Strength
The maximum stress a material can withstand before failure
In P
Can have 2 values
Weak
Opposite of strong
Toughness
-needs a large amount of energy to break it
-undergoes large amounts of plastic deformation befor breaking
-resists crack propagation
Can be measured in j/m2 or j/m3
Brittle
Opposite of tough
- don’t undergo plastic deformation
- break soon after elastic limit is reached
- cracks pass through the material quickly and usually suddenly
Hard
Resists dents and scratches
In Pa
Ductile
A material which can undergo a large amount of plastic deformation when subjected to a tensile stress
-basically can be drawn into a wire
Malleable
A material which can undergo a large amount of plastic deformation when subjected to a compressive stress
-basically can be easily hammered into shape
Fractor point
Where material breaks
UTS (ultimate tensile strength)
Max tensile force that materials can take
Electromotive force
Amount of chemical energy transferred to electrical energy per unit charge INTO the circuit
Potential difference
Energy transferred per unit charge from electrical to other forms where energy is being transferred out of the circuit
Stiff
Large young modulous
Hard to bend or Change shape
