PSI - Issue 50

V.P. Gulyaev et al. / Procedia Structural Integrity 50 (2023) 100–104 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

103

4

Table 5. Aluminum AD1 FWHM values of the diffraction line profile of FCC lattice

Tensile stress level σ = 0

Static load conditions

σ = 0,3 σ 0,2

σ = 0,5 σ 0,2

σ = 0,7 σ 0,2

σ = 0,9 σ 0,2

Initial

0.36

- -

-

- -

-

Normal Climatic area Normal Climatic area Normal Climatic area

-

0.39

0.34

2013

-

-

0.41

-

0.40

0,46

0,37

0,45

0,37

-

2015 summer

0,44

0,37

0,56

0,53

- -

0,47

0,37

0,49

0,39

2015 winter

0,49

0,38

0,57

0,50

-

…

…

…

…

…

…

…

0,50

0,36

0,49

0,36

Normal Climatic area

-

2021 winter

0,49

0,36

0,68

0,45

-

The range of FWHM values of M1 copper samples is from 0.13 to 0.32 ° with the initial FWHM value of 0.15° (Table 6).

Table 6. Copper M1 FWHM values of the diffraction line profile of FCC lattice

Tensile stress level σ = 0

Static load conditions

σ = 0,3 σ 0,2

σ = 0,5 σ 0,2

σ = 0,7 σ 0,2

σ = 0,9 σ 0,2

Initial

0,152

- -

-

- -

-

Normal Climatic area Normal Climatic area Normal Climatic area

-

0,13

0,30

2013

-

-

0,16

-

0,32

-

0,18

0,17

0,18

0,22

2015 summer

-

0,19

0,25

0,26

0,20

-

0,18

0,15

0,18

0,29

2015 winter

-

0,19

0,22

0,20

0,29

…

…

…

…

…

…

…

Normal Climatic area

-

0,18

0,17

0,22

0,24

2021 winter

-

0,20

0,21

0,24

0,26

FWHM broadening of the diffraction line profiles reflected from the system of second-order crystallographic planes indicates that the response of the planes system is not linear at different levels of the elastic stress-strain state in the operating stress range from σ = 0 to σ = 0.9σ 0.2 . A significant change in the FWHM broadening of diffraction line profile is observed in the range of stresses from σ = 0 to σ = 0.3σ 0.2 . As the stress level rises to  = 0,9  0,2 , the resistance reaction of the solid solution substructure does not increase and remains sufficiently stable. The periodic cascade change in the average FWHM values of the samples, detected by X-ray surveys over the years, may be an experimental confirmation of the elastic energy dissipation over the volume of loaded samples. The processes of elastic energy dissipation by various atomic and substructural mechanisms preserve the balanced