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Information × Registration Number 0224U002022, 0122U200378 , R & D reports Title Experimental study of crack resistance of reactor steels at biaxial loading in the temperature range -150C… + 350C popup.stage_title Head Sydiachenko Viacheslav H., Registration Date 04-02-2024 Organization GS Pisarenko Institute of Strength Problems of the National Academy of Sciences of Ukraine popup.description2 On the basis of a review of the sources of scientific literature, it is shown that the loading of postulated reactor pressure vessel cracks and standard specimens for crack resistance has a number of differences, namely: in the reactor pressure vessel, a biaxial load of a certain configuration is implemented, in which one force component is orthogonal to the crack plane, and the second is parallel to its front, and the postulated according to regulatory documents, the cracks are short (relative length a/W<0.1). The need to develop an experimental methodology for crack resistance research on non-standard type samples, taking into account short cracks and biaxial loading, is substantiated. A series of small-scale (90mm by 90mm) cruciform specimens from reactor vessel steel 15Cr2NMFAA in the initial state with a through short crack were developed, manufactured and tested to study the effect of biaxial loading on static crack resistance, determination of the brittle-ductile transition reference temperature T0 and its comparison with the temperature T0ref =-120C, determined on CT-1 specimens according to the ASTM1921 standard. Experimental data on the fracture toughness during biaxial bending, obtained on cruciform specimens, were calculated on CT-1, plotted on the Master curve, and the temperature T0=-240С was determined taking into account the biaxial load. The obtained results were analyzed with the help of finite element calculations based on the constrain parameter known from the scientific literature, which is based on the numerical determination of the opening of the crack tip. On the basis of experimental and numerical studies, it was determined that the biaxial loading of cruciform specimens with a short crack (a/W<0.2) reduces the constrain at the crack tip and, accordingly, the characteristics of the static fracture toughness increase.  Product Description popup.authors Zamotaiev Vadym S. Omelchenko Anatolii V. Pokrovskyi Volodymyr V. Sydiachenko Viacheslav G. popup.nrat_date 2024-02-04 Close