Materials and springs Flashcards
1
Q
stress
A
stress = F/A
2
Q
strain
A
x/L
where x is extension
3
Q
hookes law
A
extension is proportional to force
4
Q
F, x graph area
A
area = energy
5
Q
energy, force, extention
A
E = 1/2Fx
6
Q
gradient of Fx graph
A
k (stiffness)
7
Q
force, stiffness, extention
A
F = kx
8
Q
young’s modulus equation
A
stress/strain
Y = Fl/xA
9
Q
strain energy density
A
area under stress strain graph
energy stored do to deformation (per vol)
10
Q
elastic behaviour stress strain graph
A
curvy graph going up then back (lower) to same origin
area between there and back is energy lost to heating band
11
Q
springs in series vs parallel
A
in series k halves
in parallel k doubles
