PSI - Issue 30

L.A. Prokopyev et al. / Procedia Structural Integrity 30 (2020) 120–127

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Prokopyev L.A. et al. / Structural Integrity Procedia 00 (2020) 000–000

Fig.2. Scheme No.2 for thermal loading of steel sheet with central crack.

The advantage of the parametric design language "ANSYS APDL" in comparison with the direct method of modeling is the ability to run multiple times and optimize the model parameters. Also, the software package has a built-in tool "CINT", which allows high-precision calculations of the stress intensity factor and T-stresses. Loading is carried out by local cooling of a certain zone near the crack, as a result of which biaxial stretching of the sample region occurs due to thermal deformations. Such cooling zones were selected, at which the same values of stress intensity factor and different values of T-stresses are observed. The degree of loading is determined by the cooling temperature, while the cooling zone does not change. The resulting temperature fields on the plate surface are illustrated in Fig.3 and Fig.4. It was assumed that the temperature gradient is negligible over the plate thickness. Heat transfer by radiation and convection are not taken into account due to their small effect on the temperature fields with respect to thermal conductivity.

Fig. 3. Resulting temperature fields on the plate surface for scheme No.1.