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What happens if you stretch a material past its elastic limit
It will be permanently stretched
What are the 2 types of deformation
Elastic deformation
Plastic deformation
Until their elastic limit how do materials act
Elastically
After their elastic limit how do materials act
Plastically
What does elastic mean
It will return to it’s original shape after undergoing a force
What does plastic mean
The material is permanently deformed and will not go back to its original shape.
What does the area under a force-extension graph show
The work done (elastic potential energy)
What does the load line represent
When the force has been added
What does the unloading line represent
When the force has been removed
How can you see if the material has been deformed plastically using its loading and unloading line
They don’t start and end at the same point
How can you calculate the work done to plastically deform the material
Calculate the area between the loading and unloading lines
What happens to the line after the limit of proportionality
It begins to curve
