Welded joints are areas of increased stresses in construction. The reason for this phenomenon is associated with the nonhomogeneous mechanical, structural and geometrical properties of the weld. In the article discuss location of the crack under static and dynamic loading.
W trakcie suszenia materiałów powstające w nich pęknięcia są źródłem emisji sygnałów akustycznych. Intensywność tych sygnałów, ich liczba oraz energia mogą służyć do bieżącej oceny destrukcji materiałów w trakcie procesu suszenia. Dzięki temu możliwa jest odpowiednia kontrola warunków suszarniczych pozwalająca na uniknięcie destrukcji wyrobu. Celem pracy było przedstawienie możliwości zastosowania wielokanałowej metody emisji akustycznej do oceny stanu zniszczeń w suszonej kaolinowej próbce oraz lokalizacja miejsc ich powstawania.
EN
Cracks occurring during drying process are a source of acoustic emission signals. Intensity of these signals, their number and energy, can be used for ongoing evaluation of material destruction during drying. Therefore, one can provide a suitable control of drying conditions which allows one to avoid the final product destruction. A purpose of this paper was to present the applicability of multi-channel acoustic emission method for assessing dried kaolin sample fractures and their localization.
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Application of the acoustic emission method (IADP), to the analysis of crack initiation and growth in concrete and reinforced concrete beams is presented in the paper. This method is based on the idea that every active destructive process becomes a source of acoustic emission. Comparing AE signals, generated within structures under service load, with previously created database, one can identify the processes of active deterioration occurring in an element. They can be located on the basis of the difference in the time, that AE signal reaches the sensors with known wave velocity. Because the cracking process (micro-cracking) occurs in concrete already at the maturing stage, experiments were performed on unloaded concrete members just after concreting (when shrinkage occur) as well as on concrete beams (in technical scale) subjected to continuous loading. It was found that using the IADP method, it was possible to detect and locate creation of micro-cracks (not visible on the member surface) and initiation and growth of cracks, which are visible on the element surface.
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