Issue 49

V. Matveenko et alii, Frattura ed Integrità Strutturale, 49 (2019) 177-189; DOI: 10.3221/IGF-ESIS.49.19

and the corresponding strain in the material in the vicinity of the fiber is controlled in the calculations. Further, the values * 1   and * 2   are taken as experimental data to calculate the strain 3 exp  along the fiber based on the Eq. (4). Then the error between the strain 3  and 3 exp  is estimated. In Tab. 3 the values 1 2 3 * * * , ,    ,   ** 1   ,   ** 2   and the magnitude of the errors 1  and 2  are shown. Here 1 * 1 o u    , 2 * 2 o u    , 3 * 3 o u    ; * * 1 1 2 2 , / / o o u u                                   . The error in the calculation of strain based on the Eq. (4) is determined as follows:   1 1 3 3 3 100% exp        ,   2 exp 2 3 3 3 100%        , where 1 exp 1 3 * 1 k      , 2 exp 2 3 * 1 k      . Tab. 3 also shows the values of 1 k and 2 k , which, according to the formulas * 1 1 3 k      , * 2 2 3 k      , provide reliable strain values.

Layered model with the formation of a resin pocket [90/90]



 **



 **

1 * 

2 * 

3 * 

k

k

1  %

2  %

1  

2  

1

2

x u u  y u u  z u u 

-74.01

-94.32 -84.90

500.00 -22.26 -35.27

389.88 -35.46 -42.65

393.09

0.78 1.59 1.21

0.03

0.79 0.23 1.67

0.79

0

106.31 113.62

-5.18

104.22

70.16

0

10.08

-59.05

55.05

114.66

0

Homogeneous model with the formation of a resin pocket



 **



 **

1 * 

2 * 

3 * 

k

k

1  %

2  %

1  

2  

1

2

x u u  y u u  z u u 

-74.15

-94.17 -53.13

500.00 -20.02 -30.49

389.90 -35.96 -43.47

393.07 -13.04 -59.08

0.78 1.80 1.43

0.02

0.79 0.65 1.94

0.79

0

91.54

130.28

16.46

0

108.86

10.29

82.76

148.40

0

Layered model without the formation of a resin pocket [0/0]



 **



 **

1 * 

2 * 

3 * 

k

k

1  %

2  %

1  

2  

1

2

x u u  y u u  z u u 

-64.57 86.79 92.21

-96.30 -27.76

500.00 -14.02 -23.99

387.43 -31.33 -31.22

392.45 -13.19 -44.58

0.77 2.23 1.30

0.66

0.78 0.94 1.86

0.63

0

186.51

20.64

0

7.86

66.83

138.22

0

Homogeneous model without the formation of a resin pocket



 **



 **

1 * 

2 * 

3 * 

k

k

1  %

2  %

1  

2  

1

2

x u u  y u u  z u u 

-74.30 403.99 104.11

-94.93

500.00 -18.58 -28.63

390.04

393.31 -18.39 -43.86

0.78 5.69 0.88

0.01

0.79 0.99 1.53

0.85

0

-147.25

-105.69

629.14

26.85 96.38

0

-13.96

-25.16

12.65

0

Table 3 : The results of the evaluation of the limits of applicability of relations (4) on a model of a cube with integrated optical fiber.

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