T
1
=
Nmm
u (u
r
)
=
β
m
=
grade
Σ
=
grade
d
e1
=
mm
b
=
mm
z
1
=
Z
E
=
MPa
1/2
K
A
=
K
v
=
Z
H
=
Z
ε
=
K
Hα
=
K
Hβ
=
K
Fα
=
K
Fβ
=
Y
Sa1
=
Y
Sa2
=
Y
Fa1
=
Y
Fa2
=
Y
ε
=
Y
β
=
σ
H
=
MPa
σ
F1
=
MPa
σ
F2
=
MPa