Parametric instability in cyclic loading as the cause of fracture of hydrogenous materials

Protection of materials from hydrogen accumulation

“…Repeated treatment decreases the concentration by several times, which allows to prolong the service life of a construction. The study [15] shows, that in cyclic loading, the concentration of diffusely mobile hydrogen is of crucial importance. If the safe level is exceeded, development of local hydrogen fragility can occur by the mechanism of parametric resonance.…”

“…This effect is well known cf. [15]. Repeated treatment decreases the concentration by several times, which allows to prolong the service life of a construction.…”

Measurement of dissolved hydrogen distributions after ultrasonic peening of heat-affected zone of welded joint

“…Additional treatment reduces the hydrogen concentration several times, and this increases the service life of the 030022-3 structure. The study performed in our theoretical work [11] proved that the level of diffuse hydrogen is crucial for structures subjected to cyclic loading. When the safe level is exceeded, the development of local hydrogen embrittlement can be caused by a phenomenon referred to as a parametric resonance in mechanics.…”

“…[11]. Additional treatment reduces the hydrogen concentration several times, and this increases the service life of the 030022-3 structure.…”