PSI - Issue 13

A. Prokhorov et al. / Procedia Structural Integrity 13 (2018) 1521–1526 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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Fig. 4. Evolution of surface temperature (K) during quasi-static loading of P91-SS316LN specimen taking into account large plastic strains. Results of simulation (upper part of the specimen is SS316LN steel)

5. Conclusion

The specimens (P91-316LN) was manufactured by welded with laser beam. The evolution of the temperature field during under quasi-static tension was record by infrared camera CEDIP 420. The experimental results have shown quasi-wave character of the temperature evolution accompanying the specimenfracture process. To explain the experimentally observed phenomena the numerical simulation of temperature evolution in laser-welded specimen during quasi-static loading was carried out. According to the developed thermo-mechanical model of the process, each material of the welded sample is considered as elasto-plastic with the von Mises yield criterion and nonlinear isotropic hardening. The simulation was performed for two cases: small strain condition and large plastic strains.In case of a large plastic strains, a necking of the specimen can be described. The model has been applied to the physical justification of peculiarities of fracture observed during the quasi-static loading of P91-SS316LN specimen.

Acknowledgements The reported study was funded by RFBR according to the research project № 16 -51-48003

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