PSI - Issue 51

Victor Rizov et al. / Procedia Structural Integrity 51 (2023) 206–212 V. Rizov / Structural Integrity Procedia 00 (2022) 000–000

209

4

i u 01 is the time-dependent SE density.

where

SE density is written as

2 1

i u

01 

  .

(6)

i

i  , that is involved in (7) is time-dependent due to relaxation (refer to (2)).

The stress,

Fig. 3. Right-hand delamination arm.

The strains are expressed as 1 1 z    ,

(7)

where 1  is the curvature. The distributions of properties are

i 1 1 1 1 1   i y y y y 

i y y y y

i 1 1 1 1 1    i y y y y

i 1 1 1 1 1   

i 

i 

i    L e

D L D E E e 0 0 

HL H E E e 



,

,

.

(8)

i

i

i

i

i

i

i

i

i

i D L E 0

i HL E

i D E 0

i H E

i L  are the values of

i  at the left-hand surface, respectively. i  along the layer width, respectively.

In formulae (8),

,

and

,

and

i D E 0

i H E

The parameters, i  , i  and i  , control the variation of

,

and

In order to obtain the curvatures, first, the equation for the equilibrium of the moments is used