caracterizarea bazata pe cunoastere a capacitatii de amortizare

40
Fig.1.2.6. Reprezentarea atomilor (a) in sistemul nedeformat ( x, y, z ) , si b) in sistemul deformat
( X , YZ , ) .
Dupa deformatia biaxiala, constantele elastice diferite de zero au expresiile
cu
2
A f ′
C11 = A11 − B11
, C22 = C33 = A22 − B22
, C44 = 1 ( C )
22
− C23
,
2
C55 = C66 = A13 − B55
,
1
C12 = C13 = A13
, C23 = A22
, C25 = C46 = A25
, C35 = A25
,
3
4
11
= η ,
3 c
1
A (9 f f )
16
4
22
=
a
+
c
η ,
1
A f ′
2 2
13
= η η ,
6 c
1
= η η ,
12 2 c
3
A25
f ′
(1.2.20)
B g ′
2
11
= 8 c
η ,
B22 (6g 2 g )
2
=
a
+
c
η ,
1 [3
2 (
2 4
2
a c )]
B55
= g η + g η + η ′ ,
2
Ra
f
a
= f( R ), f = f( R ), g = gR ( ), g = gR ( ),
a
1
= η a,
2
c
1 1
R a ′
3 6
c
2 2
c
= η + η , 1
a
a
c
η = +ε, η ′ = 1+ε ′.
c
(1.2.21)