https://sci.ldubgd.edu.ua/jspui/handle/123456789/6255 2026-04-15T21:12:09Z 2026-04-15T21:12:09Z Hvozdyuk M., Hembara T https://sci.ldubgd.edu.ua/jspui/handle/123456789/7468 2020-12-14T21:06:41Z 2020-01-01T00:00:00Z

Title: Impact of corrosive medium on fatigue strength of basalt reinforcement. Authors: Hvozdyuk M., Hembara T

2020-01-01T00:00:00Z Микола ГВОЗДЮК, Тарас ГЕМБАРА https://sci.ldubgd.edu.ua/jspui/handle/123456789/7467 2020-12-14T20:59:13Z 2020-01-01T00:00:00Z

Title: ВПЛИВ КОРОЗИВНОГО СЕРЕДОВИЩА НА ВТОМНУ МІЦНІСТЬ БАЗАЛЬТОВОЇ АРМАТУРИ Authors: Микола ГВОЗДЮК, Тарас ГЕМБАРА Abstract: At the present stage of the construction in dustry development in the reinforced concrete structural elements, along with the traditional steel reinforcement, composite basalt reinforcement is used, which is made from continuous basalt fiber and a polymer matrix. Such a replacement significantly reduces the ircostand leads to significant metals avings. Basalt fibers are obtained from one-component cheap raw materials using singlestage technology. Basalt rocks are used as raw materials for the production of basalt fibers. Basalt reinforcement is characterized by high tensile strength (σВ≈ 1100 МРа), corrosion resistance and low thermal conductivity. However, the properties of basalt reinforcement has not been adequately studied yet. Therefore, the purpose of this work is to determine the fatigue strength of samples made of basalt reinforcement with a nominal diameter of 10 mm considering cyclic stretching and the influence of corrosive medium. To determine the corrosion resistance, one batch of experimental samples was kept in distilled water and the other one in alkaline medium (5% potassium hydroxide solution). Weller curves are built and endurance limits (σN) are seton a given test data base (N). The test data base (N) equals to 2⋅106 cycles. To determine the fatiguest rength of basalt reinforcement experimental studies were carried out in the laboratory at T = 20°C, with the hydraulic certified pulsator EUS-20 at cycle asymmetry R = 0,33 and load frequency f = 10 Hz. According to the results of experimental studies fatigue curves of basalt reinforcement for various corrosive media (are built and the endurance limits (σN) are established. The diagram shows that distilled waters lightly affects the fatigue endurance of basalt reinforcement compared with the strength in air, and an alkaline medium abruptly reduce sitintime.

2020-01-01T00:00:00Z Кондратюк Р.Р., Гембара Т.В., Трусевич О.М. https://sci.ldubgd.edu.ua/jspui/handle/123456789/7379 2020-12-10T19:38:11Z 2020-01-01T00:00:00Z

Title: Математическое моделирование сигналов линейных систем анализа радиационного излучения с применением интегрального преобразования Фурье и функции Дирака. Authors: Кондратюк Р.Р., Гембара Т.В., Трусевич О.М. Abstract: Забруднення навколишнього середовища радіоактивними речовинами сприяє додатковому зовнішньому та внутрішньому опроміненню населення дозами, які перевищують опромінення від природного радіаційного фону. додаткове зовнішнє опромінення можливо в результаті накопичення радіоактивних речовин на поверхні грунту, будівель, приміщень тощо. Додаткове внутрішнє опромінення можливо під час вступу радіоактивних речовин в організм з повітрям і вживанні забруднених води і харчових продуктів.

2020-01-01T00:00:00Z 1. Hembara O., Chepil O., Hembara T., Mochulskyi V., Sapuzhak Ya. https://sci.ldubgd.edu.ua/jspui/handle/123456789/7297 2020-12-06T22:12:07Z 2020-01-01T00:00:00Z

Title: Influence of temperature and hydrogen on fatigue fracture of 10kh15n27t3v2mr steel Authors: 1. Hembara O., Chepil O., Hembara T., Mochulskyi V., Sapuzhak Ya. Abstract: A theoretical and experimental approach to prognosis of fatigue crack growth behavior and determination of the remaining resource of elements of constructions under the influence of temperature and hydrogen is discussed in the paper. Kinetic fatigue fracture diagrams of austenitic steel of 10Kh15N27T3V2MR were experimentally built and analytically described at different temperatures in a neutral environment and in hydrogen. The threshold and critical values of the stress intensity factor (SIF) were found. The durability of a turbine disk was evaluated. It is found that hydrogen reduced the remaining resource of this structural element almost by 2-3 times.

2020-01-01T00:00:00Z