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Information × Registration Number 0214U007709, 0112U002783 , R & D reports Title The development of the methods of the structure elements durability estimation taking into account structure-mechanical damaging of materials near the stress concentrators popup.stage_title Head Ostash Orest, Registration Date 13-01-2015 Organization Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine popup.description2 The new laws of the fatigue process zone formation and cracks initiation in the vicinity of notches are established. It is proved that a size of this zone determines the length of the initial macrocrack. For the first time found that the physical nature of operability reduce of the aviation aluminum alloy and heat-resistant steels of the thermal power pipelines after long-term operation is substantially change of fine structure of these materials: increasing dislocation density, especially at the grain boundaries and precipitates of secondary phases and the accumulation of residual stresses of kind II. This leads to decreasing of ductility characteristics (relative elongation) and fatigue crsck growth resistance of materials after long-term service. For materials after long operation new relationships between parameters of the structure, mechanical and physical (specific electrical conductivity for nonferromagnetics and coercive force for ferromagnetics) characteristics are established, which are different from those established for such materials in the state of delivery. Device VEPR-31 is developed to assess operational degradation of aluminum alloys, which allows measurements over the dielectric layer or paint coating of 0.5 mm thickness. This device is successfully tested by the SE "ANTONOV" for evaluating aircraft wing skin operational degradation. Product Description popup.authors Івасишин Андрій Дмитрович Андрейко Ігор Михайлович Віра Володимир Володимирович Василів Богдан Дмитрович Вольдемаров Олександр Володимирович Гладиш Павло Володимирович Головатюк Юрій Володимирович Горак Ігор Степанович Горбунов Володимир Васильович Кириченко Ірина Іванівна Кисилевський Лев Несторович Подгурська Вікторія Іванівна Тепла Ніна Михайлівна Учанін Валентин Миколайович Чепіль Роман Володимирович popup.nrat_date 2020-04-02 Close