1
Q
What is the limit of proportionality?
A
The point at which the line becomes non-linear
2
Q
If a material exceeds the elastic limit, what happens?
A
Plastic deformation
3
Q
What is the equation for Poisson’s ratio?
A
Ey = -vEx
Lateral strain = -v x Direct strain
4
Q
What happens when a material is loaded below the elastic limit? (2)
A
Contraction perpendicular to the load
Not permanent
5
Q
What happens when a material is loaded above the elastic limit? (2) What is this called?
A
Contraction perpendicular to the load
Permanent, Necking
6
Q
At what angle does shear stress act?
A
45
7
Q
What is responsible for plastic deformation?
A
Dislocations are a misalignment of atoms in a material
Mechanical Engineering
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