Інші праці КПММ

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http://crust.ust.edu.ua/handle/123456789/9402
ENG: Other Works

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Browsing Інші праці КПММ by Author "Vakulenko, Ihor O."

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    Fractographic Analysis of the Destroyed Side Frame of the Truck of a Wreight Wagon
    (ПОСВІТ, Дрогобич, 2020) Vakulenko, Ihor O.; Kuzin, Nickolai O.; Vakulenko, Leonid I.
    EN: The initial inspection of damaged frame in fracture revealed two sections with characteristic structural features. The area with traces of slight corrosion, representing a smooth surface, corresponds to the gradual movement of fatigue crack. The rest of fracture surface with signs of a dynamic destroy has a qualitatively different structure. The fatigue part occupies approximately 30% of the total cross-sectional area. The propagation front of fatigue crack, after reaching the outer and inner surfaces of vertical wall from the side of wheel, reaches half the length lower horizontal wall. The focus of origin fatigue crack, located in lower inner corner, when moving from vertical wall to horizontal part of the side frame, is difficult obtain access when visually inspecting the frame trolley.
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    The Morphology Analysis of the Structure Aluminum Alloy at Friction Stir Welding
    (Посвит, Дрогобич, 2020) Plitchenko, Serhii; Vakulenko, Ihor O.
    EN: The main components of friction stir welding process of an aluminum-based alloy (AMg6) are considered. As a result of passage working tool along of connecting edges, formation a temperature gradient on their thickness determines development processes of structural changes. Based on this, in different layers of the weld, in accordance with the heating temperature, a different degree of plasticization alloy is achieved. Separate structural zones of the welded joint and their influence on the value of hardness are considered. The observed asymmetry of the weld is determined by the direction of rotation working surfaces of the tool. Based on the analysis of results of studies for the AMg6 alloy, an explanation is proposed for the formation gradient structures in the weld zone during friction stir welding.