PSI - Issue 40

N.A. Makhutov et al. / Procedia Structural Integrity 40 (2022) 275–282 N. A. Makhutov, I. V. Makarenko / Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 1. Scheme of welded plates with crack- like discontinuities such as lack of fusion: (a) samples with a symmetrical weld; (b) samples with an asymmetric weld.

On Fig. 2 shows a photo of welded, flat samples with a thickness of 25 mm, 70 mm, 100 mm after testing at temperatures of 295K, 170K, 77K. Welded and non-welded cylindrical tubular samples were used to study the characteristics of crack resistance and kinetics of the original inclined surface semi-elliptical low-cycle cracks. Fig.3 shows diagrams of a cylindrical welded sample with applied initial surface multi-oriented semi-elliptical defects such as cracks, the fracture surface of the developing initial crack at low-cycle loading and a photo of a tubular non-welded sample with the original inclined cracks.

Fig. 2. Photo of flat welded samples after testing at T = 77K with a thickness of 100 mm and 25 mm and at T = 295K with a thickness of 70 mm, as well as a thickness of 25 mm at T = 170K.