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Information × Registration Number 0217U006698, 0115U000123 , R & D reports Title The development methods for assessment and means for increasing of strength and fracture toughness of structural materials and their welded joints taking into account structural and mechanical degradation in operational environments popup.stage_title Head Ostash Orest, Registration Date 27-12-2017 Organization Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine popup.description2 The new engineering techniques for prediction of the fatigue durability of different geometry notched specimens based on the basic fatigue curve and kinetic diagrams of fatigue failure, obtained on standard specimens, are proposed. It was established that the defining parameter of the high-strength carbon steels workability under conditions of a complex stress state during a cyclic loading is the ability of a material to relax of mechanical stress. It has been found that the highest endurance of such steels provides mixed structure of the lower bainite and martensite and also the heat treatment mode for obtaining this structure with low level of the local residual stresses. The effective increasing of the structural strength of the D16T aluminium alloy welded joints is achieved by welding in a solid state (friction stir welding). A new type of kinetic diagram of fatigue failure has been discovered, were linear Paris region not exists. This is connected with the specific structure of the metal after thermomechanical shear processing. It has been shown that the presence of water vapor causes the degradation of the YSZ-Ni cermet, in particular at high concentration of water vapor. The difference in the mechanism of various titanium MAX-phases oxidation in the range of temperatures 600 ... 1200 ° С is established. The ability for prediction of the robustness of Al-Mg and Al-Cu-Mg alloys welded joints by non-destructive method is shown based on correlation dependencies between the local specific conductivity and strength and fatigue crack growth resistance characteristics. Product Description popup.authors Івасишин Андрій Дмитрович Віра Володимир Володимирович Василів Богдан Дмитрович Головатюк Юрій Володимирович Горак Ігор Степанович Кириченко Ірина Іванівна Кисилевський Лев Несторович Подгурська Вікторія Ярославівна Тепла Ніна Михайлівна Учанін Валентин Миколайович Чепіль Роман Володимирович Шаповалов Георгій Олександрович popup.nrat_date 2020-04-02 Close