PSI - Issue 13

Tatyana Tretyakova et al. / Procedia Structural Integrity 13 (2018) 1774–1779 Author name / Structural Integrity Procedia 00 (2018) 000–000

1778

5

14.57 P  kN, 2 —

Fig. 6. Evolution of longitudinal strain fields at the surface of specimen with 0 50.0 l  mm during uniaxial tension test: 1 —

16.53 P  kN, 3 —

16.02 P  kN and 4 —

12.92 P  kN.

Fig. 7. Experimental set-up: the Instron 8850 biaxial servo-hydraulic testing system, the DIC measurement system Vic-3D and the infrared system Flir SC7700M (a); two surfaces of specimen for DIC and IR analysis (b). Conclusions It was revealed that with increasing stiffness of the loading system (by decreasing the gauge length of specimens), the realization of the stable postcritical deformation stage is increasing as well as the inhomogeneity of plastic flow and temperature in the crack tip. The results shown that the failure of the specimen with longer gauge length caused the localized heating of material. The digital image correlation technique and the infrared thermography are important tools for observing and studying the nucleation and propagation of the crack in bodies with stress concentrators during loading. The combined use of several registration systems allows obtaining accurate and complex experimental data for further modeling of the inelastic behavior and processes of the stable crack growth in metals. Acknowledgements The work was carried out in the Perm National Research Polytechnic University in the Center of Experimental Mechanics with support of the Russian Science Foundation (Project 16-19-00069).