2 Strength of Machine Elements

Nomenclature

b
cylinder length, mm
E
elastic modulus, MPa
F
force, N
K A
service factor, or application factor
K σ
combined influence factor
k f
fatigue stress concentration factor
k t
geometric stress concentration factor
k σ
fatigue stress concentration factor in tension
k τ
fatigue stress concentration factor in shear
m
material constant
N
number of load cycles
N 0
critical number of cycles
N v
equivalent number of cycles
q
notch sensitivity factor
r
stress ratio
S
safety factor
S ca
calculated safety factor
[S]
allowable safety factor
β q
intensify factor
β σ
surface condition factor for tension
ε σ
size factor for tension
μ
Poisson's ratio
ρ
radius of curvature, mm
σ
tensile stress, MPa
σ −1
endurance limit of a material at r = −1, MPa
σ −1e
endurance limit of an element at r = −1, MPa
σ −1Nv
endurance strength at r = −1 and N = N v , MPa
σ 0
endurance limit at r = 0, MPa
σ 1,2,3
principal stresses, MPa
σ a
stress amplitude, MPa
σ b
ultimate, or tensile strength, MPa
σ ca
calculated tensile stress, MPa
σ e
equivalent stress, MPa
σ lim
material strength, MPa
σ m
mean stress, MPa
σ max
maximum stress, MPa
σ min
minimum stress, MPa
σ r
endurance limit at stress ratio r, MPa
σ rN
endurance strength at r and N, MPa
σ r∞
endurance limit, ...

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