Materials Flashcards
What happens when a spring reaches its elastic limit?
It doesn’t return to its original length when the load is removed.
How is the load split for springs in parallel?
The load is split between the springs.
How is the load split for springs in series?
Each spring experiences the full load.
What is the k in Hooke’s Law?
Spring constant - it tells us how stiff the spring is.
What is Hooke’s Law?
The extension of a spring is proportional to the force exerted on the spring within the limit of proportionality.
What is the Spring Constant measured in?
Nm-1
What is stress measured in?
It is force per unit area - this is measured in Pascals or Nm-2
What is strain measured in?
Nothing!!
What is the limit of proportionality?
The limit beyond which, when a wire or a spring is stretched, its extension is no longer proportional to the force that stretches it.
What is Young’s Modulus?
Stress over Strain
What is the yield point?
The point at which the stress in a wire suddenly drops when the wire is subjected to increasing strain.
Can a brittle object
A) snap without any noticeable yield
B) be drawn into a wire
A) snap without any noticeable yield
Can a ductile object
A) snap without any noticeable yield
B) be drawn into a wire
B) be drawn into a wire
Define Plastic deformation
Deformation of a solid beyond its elastic limit
What is the unit for density?
kgm-3
