PSI - Issue 35

Domen Šeruga et al. / Procedia Structural Integrity 35 (2022) 150–158 Sˇ eruga et al. / Structural Integrity Procedia 00 (2021) 000–000

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Fig. 7. a) Strain tensor components at control point 2 and b) stress-strain response at control point 2. Green line represents the response due to inner pressure, blue line represents the response at 20 ◦ C and red line represents the response at 300 ◦ C. The dashed line represents the simulation using the reference model.

Fig. 8. Fatigue damage accumulation at control point 2 during the first four repetitions of the load history. The thick blue and the dashed lines represent the damage accumulation using the simulation results with the Prandtl and the reference model, respectively.

structural response simulations of the pipe bend have been carried out using the AMD Ryzen Threadripper 1950X 16-Core Processor with 64 GB of RAM. The application of the Prandtl model lasted 1240 s whereas the simulation with the reference model took 1753 s to accomplish. The di ff erence in the computational time of around 30 % is consistent with the results of the previous study (Nagode et al. (2021)).

4. Conclusion

The implemented Prandtl operator approach enables a simulation of a temperature-dependent elastoplastic re sponse of the pipe bend, exposed to an arbitrary thermomechanical load history. Here, a benchmark simulation has been performed showing the capabilities of the implemented material model. For the pipe bend, exposed to a variable thermomechanical load history, it is possible to determine the elastoplastic stress-strain response considering kine-