σ
Hlim
=
MPa
σ
H
=
MPa
Z
N
=
Z
L
=
Z
R
=
grade
Z
v
=
Z
w
=
σ
Flim
=
MPa
σ
F1
=
MPa
σ
F2
=
Y
x
=
Y
N1
=
Y
R1
=
Y
δ1
=
Y
N2
=
Y
R2
=
Y
δ2
=
S
H
=
S
F1
=
S
F2
=