PSI - Issue 59

Viktoriia Ihnatieva et al. / Procedia Structural Integrity 59 (2024) 487–493 Viktoriia Ihnatieva/ Structural Integrity Procedia 00 (2019) 000 – 000

492

6

Solving this equation we obtain   2 lnp x x lnC    at

  2 x p x C e     . The constant C is determined from the initial conditions at 0 c x , C p    . Thus, the law of pressure change in this case is described by the exponential dependence   2 x c p x p e     .

(14)

The volume of binder that is removed during the formation of a given profile element per unit time must be equal to the total volume of binder that passes through its surface   2 1 1 L np c k F   

x p e dx  

0 

.

(15)

Q







r

c



0  

 

2

Value . Substituting the values we obtain 0 5 x e dx ,   

L np

3

k



   

   

0 907 ,





1   

1

Q

h p

.

(16)





1

1

r

c c

2



1 

пр  . We obtain the value of the binder area in the cross-section of the

Divide the volume by the pulling speed

product, which, when removed, will provide a pressure value equal to c p .

If the binder contained in the semi-finished product is sufficient to ensure complete impregnation of the considered section of the braiding layer, its excess area is defined as the difference between the total area of the binder required for impregnation and the area of the already used binder.         0 0 0 0 0 0 2 1 2 1 2 1 c ф ф c r c c r F h L h h L             . (17) Then the moulding pressure, which occurs in the volume of the moulding device, is determined from the following expression       0 0 1 1 1 13 1 0 907 1 1 ф np r c L np , L p , k                    . (18) The analysis of the formula shows that it can be used to calculate the pressure in the moulding device or die when forming any section of the profile. In this case, the variables are the longitudinal permeability coefficient, binder viscosity and relative impregnation depth of the braid layer. The longitudinal permeability coefficient is a function of the structural parameters of the base material of the profile elements. The viscosity of the binder depends on the temperature regime of processing of a given section of the profile. Relative impregnation depth of the braiding layer is obtained at the preliminary stages of force processing of the semi-finished product. Structural analysis of the formula shows that the pressure created in the material structure depends linearly on the binder viscosity, broaching speed and pre-impregnation of the braid layer. At the same time, this structural