Materials (C6) Flashcards
(27 cards)
What occurs with a net force
acceleration or a change in shape
Compressive force is a
squeeze
Tensile force
stretch
What is an extension
change in length
What is Hooke’s law
the amount of force applied is directly proportional to the change in length
Units of k in F=kx
N/m
What has happened to an object when it reaches it elastic limit
It no longer follows Hooke’s Law
What happens in elastic deformation
The object returns to its orginal shape
What is it called when an object permantly deforms
plastic deformation
What occurs in the elastic region
energy is stored
What is it called where energy is lost
plastic region
What is work done on a spring graph
Area of a force extension graph
Name for up and down when stretching a spring
loading and unloading
Name for the material not return to its original size
hysteris loop
Define stress
Force applied per area
Define strain
ratio of change in length to the original length
Unit for stress
pascal
Unit for strain
no unit
Define ductile
Can be hammered into a sheet or stretched into a wire
What occurs on the stress strain graph (4)
limit of proportionality
Elastic limit
Yield point
Breaking point
what is the yield point
Where rapid extension occurs after
What three things usually occur very close together on a spring extension
limit of proportionality
elastic limit
yield point
What is UTS
Ultimate tensile strength
most force an object can handle
What is young’s modulus a measure of
stiffness
extension given a pressure
