PSI - Issue 38

Benaouda Abdellaoui et al. / Procedia Structural Integrity 38 (2022) 116–131 Benaouda Abdellaoui et al / Structural Integrity Procedia 00 (2021) 000 – 000

118

3

a)

b)

Fig. 1. (a) original mechanical part (b) new design

1

Nomenclature

wt%

mass percentage

F

force

S0

cross section maximum height

Ra Rt

arithmetic mean roughness total height roughness

Rz Sa L 0

average roughness depth St arithmetic means height Sz

maximum height depth

R L t

radius transition

measuring length

Lc

calibrated length

total length

Rm

ultimate tensile strength Z%

striction

Rp 0,2% yield strength at 0,2% plastic strain A5D

elongation strain ratio

Δε E ε e σ e σ f '

strain range young modulus elastic strain elastic stress

Δσ

stress range total strain plastic strain plastic stress

Rε

ε t ε p σ p

maximum strain

 max

σ r N

total stress

number of cycles

fatigue strength coefficient plastic strength coefficient

b

fatigue strength exponent fatigue ductility coefficient

c

fatigue ductility exponent K’ cyclic hardening exponent

ε f ’

n’