PSI - Issue 28

A. Prokhorov et al. / Procedia Structural Integrity 28 (2020) 1579–1589 Author name / Structural Integrity Procedia 00 (2019) 000–000

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4. Results 4.1. Temperature measurements and simulation The results of temperature measurement in the all-side freezing experiment by thermocouple and FBG sensors are shown in Fig. 3.

10 15 20

TC1 TC2 TC3

0 5

-20 -15 -10 -5

Temperature, C

0

1

2

3

Time, s

10 5

a b Figure 3. Temperature measurements by thermocouple ТС1, ТС2, ТС3. (b) Temperature measurements by FBG sensors

In the figures we can see that an earlier temperature decrease is registered by the sensors located close to the specimen sides. Then the temperature decrease is sensed by the sensors placed close to the specimen center. The slowest temperature decrease is observed for the sensor placed at the specimen center. In Fig. 4 numerical prediction of the temperature at the specimen center and measurements given by the thermocouple are presented. It can be seen the prediction shows a good qualitatively agreement to the experimental data.

Figure 4. Evolution of temperature (solid line – experimental data, dotted line – simulation results)