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Information × Registration Number 0211U000630, 0108U004277 , R & D reports Title Development of a magnetoacoustic method for detection of local damage in materials and in structural elements popup.stage_title Head Skalsky Valentyn, Доктор технічних наук Registration Date 14-02-2011 Organization Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine popup.description2 Object of study – the displacement field in the form of elastic waves of magnetoelastic acoustic emission, generated by spontaneous jump-like displacements of magnetic domain walls during reversal magnetization of ferromagnetic material under the influence of external magnetic field. The goal of research – to establish the effect of structural changes and the degree of bulk degradation of structural ferromagnetic materials on the magnetoelastic acoustic emission signal generation and to develop the methodological fundamentals and to engineer the instrumentation for location of the local degradation employing the theoretical and experimental studies. In order to achieve the objective of this project the theoretical study has been conducted which concerned with the relationship between the 90°-domain wall jump in the bulk of ferromagnetic material and the displacement of the half-space surface caused by this jump (magnetostrictive effect). The algorithm for evaluation of stress intensity factor in the vicinity of crack-like defects in ferromagnetic material under the influence of external magnetic field has been synthesized. The experimental work has been conducted to quantitatively evaluate how the parameters of magnetoelastic acoustic emission signals depend on structural changes and on the degree of bulk degradation of structural material. The instrumentation that employed magnetoelastic acoustic emission signals for detection of local degradation of ferromagnetic structural elements has been engineered. Product Description popup.authors Великий Петро Пилипович Гірний Святослав Ігорович Долішній Петро Михайлович Клим Богдан Петрович Коссак Юрій Зенонович Лясота Ігор Миколайович Михальчук Віталий Богданович Окрепкий Юрій Степанович Плахтій Роман Михайлович Почапський Євген Петрович Рудавський Денис Володимирович Сергієнко Олег Миколайович Станкевич Олена Михайлівна Толопко Ярослав Дмитрович popup.nrat_date 2020-04-02 Close