Chemistry Reference
In-Depth Information
Let us pay attention in conclusion to two important, in our opinion, cir-
cumstances: firstly, it has been found out (Fig. 13.13), that the strain of stable
crack advancement beginning e
b
grows at n
cl
increase according to the fol-
lowing empirical approximation [1]:
ε ≈ 1.62×10
−29
n
cl
.
(13.18)
FIGURE 13.13
The dependence of stable crack propagation beginning strain e
b
on
entanglements cluster network density n
cl
for PASF film samples [1].
And at last, for fractal cracks the following empirical relationship is valid
[22]:
D
-
1
Gl
~
(13.19)
c
Ic
st
As it follows from the plot of
Fig. 13.14
,
the Eq. (13.19) is valid for
PASF considered film samples that confirms the correctness of the fractal
analysis application for their fracture description [1].
