Strength of Materials Flashcards
1
Q
Stress Formula, σ
A
σ = F/A
2
Q
Two types of normal stress
A
Tensile and Compressive
3
Q
What is Bearing Stress?
A
Contact pressure between separate body
4
Q
Shear Stress
A
Sliding caused by the load
5
Q
Deformation under axial loading formula
A
δ = PL / AE
6
Q
Stiffness formula
A
k = P / γ
7
Q
Flexibility Formula
A
f = 1/k
8
Q
What is Modulus of Resilience
A
-Area of elastic zone
-energy needed to return to its original form
9
Q
Modulus of Toughness
A
-area of yielding + strain hardening + necking
-energy needed for the steel to break
10
Q
Strain energy formula
A
ω = Pδ / 2
11
Q
Poisson’s Ratio
A
ν = - εy / εx
= - lateral strain / axial strain
12
Q
Multi-Axial Strain Formula
A
εx = 1/E [σx - ν(σy + σz)]
εy = 1/E [σy - ν(σx+ σz)]
εx = 1/E [σz - ν(σx + σy)]
13
Q
Dilatation
A
e = ΔV/V ~ εx + εy + εz
