Search academic texts

Registration Number

0224U002774, 0119U101758 , R & D reports

Title

Prediction of the effect of preliminary thermomechanical loading on the crack resistance of heat-resistant steels under loading in modes I, II, III and their combinations, taking into account the effect of scale

popup.stage_title

Head

Pokrovskyi Volodymyr V.,

Registration Date

29-02-2024

Organization

GS Pisarenko Institute of Strength Problems of the National Academy of Sciences of Ukraine

popup.description2

A set of experimental techniques for the study of crack resistance under mixed modes of deformation was developed, taking into account the test temperature in the temperature range -1000С...+3000С. The effect of mixed deformation modes on the characteristics of static crack resistance was investigated on the 15Cr2NMFAA reactor vessel steel, taking into account the scale effect. It is shown that the resistance to the development of cracks by the value of the equivalent mixed I+II+III modes fracture toughness increases with increasing test temperature, while the increase in the load of the transverse and longitudinal shear components reduces the intensity of the change in crack resistance. Experimentally and computationally, it was established that the increase in the static fracture toughness as a result of the previous thermomechanical loading in mixed I+II+III modes decreases with the transition to transverse and longitudinal shear loading. According to the results of finite-element modeling of different geometries specimens, the change in the constrain parameter was analyzed, which is based on the calculations of the crack tip opening for the mode I crack and can be used in two-parameter approaches to assess the integrity of structural elements taking into account biaxial loading. It is shown the need to take into account the change in the temperature dependence of the fracture toughness depending on the load modes and the stress state triaxiality around the crack tip for a more accurate assessment of the residual resource of structural elements operating under the influence of a complex stress state. 

Product Description

popup.authors

Yezhov Vitalii M.
Zamotaiev Vadym S.
Korchevskyi Andrii K.
Omelchenko Anatolii V.
Pokrovskyi Volodymyr V.
Sydiachenko Viacheslav H.
Shakhalov Ihor V.

popup.nrat_date

2024-02-29