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1
Content available Application of acoustic emission in fatigue fracture diagnostics
Skalsky V., Halan P.
Acta Mechanica et Automatica
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2010
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Vol. 4, no. 4
95-98
EN
The most important peculiarities of the acoustic emission under fatigue loading are reviewed. Dependences of the AE signals and parameters of the growing fatigue crack on the basis of an existing literature source review are established. An essential role of the correlation for determining the crack growth rate in the relation between the AE parameters and crack parameters are shown. An energy approach for determination of cycle quantities till the initiation of a crack is proposed.
2
Content available Determination of influence of thermo-cycles on hydrogen cracking of steel
Skalsky V., Rudavskyy D., Matvijiv Y.
Diagnostyka
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2009
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nr 2(50)
19-22
EN
Influence of thermo-cycles "heating-cooling" on the hydrogen induced cracking of structural steels, which are widely used in the heat-power equipment is investigated in this paper. An acoustic emission method of diagnostics of specimens made of exploited and non-exploited material of steam pipelines is described. Effective diagrams of dependence of number of events on heat cycle number for the all groups of specimens are plotted.
3
Content available Calculation and optimization of waveguide geometry for acoustic emission signals
Skalsky V., Serhiyenko O., Selivonchyk T., Tolopko Y.
Diagnostyka
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2009
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nr 1(49)
3-6
EN
Optimization of geometrical sizes of the waveguide of elastic acoustic emission (AE) waves, which is used in the search of hydrogen induced cracking during thermal cycling of structure alloys in a gaseous hydrogen environment, is considered. A waveguide is considered as on acoustic system that has the discrete spectrum of eigenfrequencies. Distribution of temperature field along the waveguide is calculated, decay of elastic AE waves is estimated. Basing on the obtained results the design implementation of the waveguide is carried out.
4
Content available Estimation of diagnostics of fibers failure in composite materials by the method of acoustic emission
Skalsky V., Serhiyenko O., Rudavskyy D., Matviyiv Y.
Acta Mechanica et Automatica
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2009
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Vol. 3, no. 4
65-68
EN
The model of acoustic emission caused by formation of penny-shaped cracks in fiber composite materials taking into account stress relaxation in breaking fibers is proposed. It is found that the maximal values of components of displacement vector are directly proportional to the total area of defect, which is formed, and inverse proportional to the relaxation time.
5
Content available Portable multi-channel device for acoustic emission monitoring of structures and products
Skalsky V., Serhiyenko O., Pochapsky Y., Plakhtiy R., Sulym R.
Diagnostyka
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2008
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nr 3(47)
43-45
EN
In the paper eight channel acoustic emission (AE) device for selection, recording and processing signals of AE intended for use in the sphere of non-destructive testing of materials, products and structures of various forms and functional applications is described. The device is designed using a wide range of SMD elements and is adapted to work with Windows family operating systems. Specially developed software realizes functions of input data processing and its visualization, determination of defect position and storing the obtained results into computer memory. The above-listed characteristics as well as high rate of data exchange between the device and PC (12 Mbit/s), enables to work in real-time mode, and efficient software allow to compete with developments of such world leading manufacturers as PAC, Vallen Systeme, Interunis etc.
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