Materials Flashcards
1
Q
ρ = (density)
A
m / v
2
Q
Volume of sphere
A
4/3 π r^3
3
Q
volume of cylinder
A
πr^2h
4
Q
F = (Hooke’s law)
A
kΔL
5
Q
Define limit of proportionality
A
Point beyond which HOOKE’S LAW IS NO OONGER TRUE
6
Q
Define elastic limit
A
The maximum amount a material can stretch and STILL RETURN to its original length
7
Q
E =
A
σ / ε
8
Q
σ =
A
F / A
9
Q
ε =
A
ΔL / L
10
Q
E = (expanded)
A
(F L) / (A ΔL)
11
Q
Define yield stress
A
The force per unit area which the material extends PLASTICALLY FOR LITTLE INCREASE in stress
12
Q
Define breaking point
A
The maximum stress a material can withstand before fracture
13
Q
Define plastic deformation
A
Permanent deformation
14
Q
Elastic strain energy =
A
Area under FORCE- EXTENSION graph
15
Q
Elastic strain energy of elastic material
A
1/2 F ΔL
