Search academic texts

Information × Registration Number 0223U002606, 0122U200402 , R & D reports Title Determination of the materials physical and mechanical characteristics for critical equipment structural elements, taking into account the influence of deformation anisotropy and loading history on their current state for predicting and extending the life-time. popup.stage_title Head Kharchenko Valerii V., Доктор технічних наук Registration Date 24-02-2023 Organization GS Pisarenko Institute of Strength Problems of the National Academy of Sciences of Ukraine popup.description2 A program of experimental studies of different specimen’s types under various types of thermoforce loading was developed, and the experimental and stand base was modernized for conducting tests of researched materials, structural elements or their models in conditions that reproduce or simulate operational ones. A working model of the acoustic emission (AE) system and the corresponding working version of the "AE Monitor" software for registration and display of AE signals in real time were developed and manufactured. The main stages of production of heat-insulating carbon-carbon composite materials and methods of improvement and research of their operational characteristics are considered and analyzed. General approaches to modeling operational regimes of thermal load of rocket and space technology elements in bench conditions are formulated. A study was conducted to determine the current damageability of the material taking into account the influence of deformation anisotropy and load history using the LM-hardness method, which included, in particular, the development of a methodology for assessing the damageability of heat-resistant steels under long-term static and cyclic loads. The analysis of the evolution of the statistical characteristics of deformation defects was carried out based on the application of calculation and experimental methods of digital images correlation of the deformed structure state of the relief of deformation defects, which is reflected in the change in the characteristics of their distribution. Existing approaches for estimating the fracture toughness of reactor steels on the lower shelf of the temperature dependence after "warm prestressing" were analyzed. It is shown that the main factors affecting the increase in fracture toughness after " warm prestressing" are: residual compressive stresses, strain hardening of the material, and blunting of the crack tip Product Description popup.authors popup.nrat_date 2023-02-24 Close