Hydrodynamic ductile erosion of aluminium by a pulsed water jet moving in an inclined trajectory

0503701 - ÚGN 2020 RIV CH eng J - Článek v odborném periodiku
Hloch, Sergej - Adamčík, P. - Nag, A. - Srivastava, M. - Čuha, D. - Müller, M. - Hromasová, M. - Klich, Jiří
Hydrodynamic ductile erosion of aluminium by a pulsed water jet moving in an inclined trajectory.
Wear. 428-429, June 2019 (2019), s. 178-192. ISSN 0043-1648. E-ISSN 1873-2577
Grant CEP: GA MŠMT(CZ) LO1406
Institucionální podpora: RVO:68145535
Klíčová slova: pulsating water jet * Standoff distance * ductile material * erosion deformation
Obor OECD: Materials engineering
Impakt faktor: 4.108, rok: 2019
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0043164818314601

This study addresses the erosion transition of an aluminium surface arising from the periodic impact of a tangentially
acting pulsating water jet (PWJ) with a spatial frequency of f=20 kHz. The erosion effect was observed
as a function of the standoff distance z (mm) along an incline (from 5mm to 90 mm) and constant
trajectory (at standoff distances of z=25 mm, 75mm and 125 mm) at a jet pressure of 100 MPa and traverse
speed v=10 mm/s. The aim of this study is to assess the manner in which the erosion along the PWJ pathway
changes the measured dynamic signal (by means of acoustic emission measurements). The effects of hydrodynamic
erosion, such as elastic and plastic deformation, were observed with the aid of a scanning electron
microscope and compared with time records in terms of acoustic emission (AE) recorded during impact. Moving
the PWJ head and gradually changing the standoff distance along the inclined trajectory resulted in different
erosion regimes. With a gradual increase in the standoff distance (from 5mm–90 mm), the observed erosion
regimes were observed in terms of micro-pitting action, crack and crater formation and material folding/upheaving.
The erosion effects of a PWJ compared with those of a continuous water jet were investigated at
constant standoff distances of z=25 mm, z=75mm and z=125 mm. The differences in the erosion phenomenon
under different conditions were observed in terms of the material damage, crater dimensions and
surface and sub-surface features. The AE recorded during the impact of the PWJ demonstrates a correlation
between the ongoing erosion phenomenon and the AE signals. This relation for the encoded complex waveform
(PWJ) confirms the significant information about the ongoing process in terms of material deformation and
dislocation movement.
Trvalý link: http://hdl.handle.net/11104/0295505