Springs And Materials Flashcards
What is the limit of proportionality?
The point at which a material is no longer obeying Hooke’s Law but could still return to its original shape of the load were removed
What is the yield point?
The point at which a large amount of plastic deformation will take place with a constant or reduced load
What is elastic deformation?
Deformation in which the material may return to its original shape after the load is removed
What is plastic deformation?
Deformation which leaves the material permanently deformed
Give the equation for elastic strain energy
1/2ke^2
What is breaking stress?
The point at which the atoms of the material can no longer stand the force of the load and separate completely, breaking the material.
Describe what is meant by ‘stiff’
Having a high resistance to bending and stretching - a high Young modulus
What is toughness?
The amount of energy a material can absorb before it breaks
Describe what is meant by ‘brittle’
Breaking suddenly without any plastic deformation
Describe what is meant by ‘ductile’
A material keeping its strength even when deformed into wires
Describe what is meant by ‘hard’
Very resistant to cutting, indentation (denting), and abrasion (scratching)
Describe what is meant by ‘malleable’
A material changing shape easily but losing its strength
Give the equation to find the total spring constant of two springs in parallel
k = k1 + k2
Give the equation to find the total stress in two springs in parallel
F = F1 + F2
Give the equation to find the total strain of two springs in parallel
x = x1 = x2
