PSI - Issue 42

A. Sulamanidze et al. / Procedia Structural Integrity 42 (2022) 412–419 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

415

4

Table 1. Electromagnetic and fluid dynamics properties for nickel- based alloy ХН73М . electromagnetic fluid dynamics Temperature, [°C] relative magnetic permeability , μ bulk conductivity, κ [S/m] thermal conductivity, λ [W/m*K]

heat capacity, Cp [J/kg*K]

23

1.002 1.002 1.002

813890 790448 768239

11.9 15.9 20.5

422 502 608

400 650

Table 2. Mechanical properties for nickel- based alloy ХН73М.

Temperature, [°C]

Young's modulus, E [MPa]

yield stress, σ 0 [MPa]

tangential modulus, G [MPa]

strain hardening exponent, n

thermal expansion coefficient, α th [1/°C]

23

215775 203780 189236

550 550 780

89.99 78.37 72.78

0.244 0.222 0.135

1.14*10 -5 1.36*10 -5 1.57*10 -5

400 650

4. Numerical results and discussion 4.1. Characterization of un-cracked specimen behavior.

The proposed algorithm of multi-physics FE-computations has been validated through the comparison and demonstration with the result of measurement on experimental setup, for which consistent data has been produced, allowing for greater confidence in used technique. To this end in Fig. 3a is given the evaluation the numerical relationship between cycling time and temperature during IP and OOP loading of the un-cracked specimen. The TMF computations were performed at a temperature range of 400°C - 650°C in the cycle including 30 seconds of loading (heating)/unloading (cooling) periods. Identify characteristic points of each cycle; e.g. start, end, max stress and min stress. It can be seen that these distributions clearly identify characteristic points of each cycle; i.e. start, end, max temperature and min temperature during first five loading cycles.

Fig. 3. (a) Comparison IP and OOP numerical temperature distribution and (b) COD behavior for first five loading cycles.

Figure 3b represents for the same IP and OOP loading conditions the total strain versus the cycling time curves at the extensometer gauge position on the lateral surface of the un-cracked SENT specimen. This is done for the middle plane of the sample at the location of the original notch. It is observed that there is a slight delay in the distributions of displacements with respect to the temperature cycle for the conditions of IP and OOP. The results shown in Fig. 3 confirm that the properties of the ХН73М alloy listed in Tables 1 and 2 correctly reflect the interrelated processes of electromagnetism, fluid dynamics and heat transfer, as well as inelastic deformation.