Chemistry Reference
In-Depth Information
FIGURE 13.7
The relation between experimental d
c
and calculated according to the Eq.
(13.7)
T
d
crack critical opening values for PASF film samples [1].
In Fig. 13.7, the comparison of experimental and calculated according to
the Eq. (13.7) crack critical opening values is adduced, which shows their
satisfactory conformity.
As it is known [16], within the frameworks of elastic fracture linear me-
chanics the value d
c
can be determined alternatively according to the Dug-
dale model:
2
Ic
K
,
(13.8)
d
=
c
s
E
Y
where
K
Ic
is critical stress intensity factor (stability to crack propagation)
and local plasticity zone (ZD) length
r
p
can be estimated according to the
Eq. (5.3).
The Eqs. (5.3) and (13.8) combination gives the relation of parameters
d
c
and
r
p
[1]:
p
E
,
(13.9)
r
=
d
p
c
8
s
Y
and the Eqs. (1.9), (2.20) and (13.9) combination allows to obtain the fol-
lowing formula [1]:
