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2 2009

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Determination of influence of thermo-cycles on hydrogen cracking of steel

Skalsky V., Rudavskyy D., Matvijiv Y.

Diagnostyka

2009

nr 2(50)

19-22

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.

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

2009

Vol. 3, no. 4

65-68

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.