Chapter 5: Design of Machine Elements for Strength

SYMBOLS ^[5], ^[6]

A		area of cross-section, m ² (in ²)
b		a shape factor ( b > 0)
B		a constant
e _sz		size coefficient
e _ST		surface coefficient in case of tension and bending
e ? _ST		surface coefficient in case of torsion
E		Young's modulus, GPa (Mpsi)
F		normal load (also with suffixes and primes), kN (1bf)
F ? _m		static equivalent of cyclic load, kN (1bf)
G		modulus of rigidity, GPa (Mpsi)
h		thickness, m (in)
K _sz		size factor
K _ST		surface factor
K _?		theoretical normal stress-concentration factor
K _T		theoretical shear stress-concentration factor
K _{f ?}		fatigue normal stress-concentration factor
K _fT		fatigue shear stress-concentration factor
M _b		bending moment (also with suffixes and primes), N m (1bf in)
M ? _bm		static equivalent of cyclic bending moment, N m (1bf in)
M ₁		twisting moment (also with suffixes and primes), N m (1bf in)
M ? _tm		static equivalent of cyclic twisting moment, N m (1bf in)
n		safety factor a constant
n _a		actual safety factor (also with suffixes)
n _d		design safety factor (also with suffixes)
q		index of sensitivity
q _f		index of notch sensitivity for alternating stresses
r		notch radius, mm (in)
t		time, h
x ₀		the guaranteed value of x ( x

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