Effects of liquid droplet volume and impact frequency on the integrity of Al\nalloy AW2014 exposed to subsonic speeds of pulsating water jets

0547248 - ÚFM 2023 RIV CH eng J - Článek v odborném periodiku
Poloprudský, Jakub - Nag, A. - Kruml, Tomáš - Hloch, Sergej
Effects of liquid droplet volume and impact frequency on the integrity of Al
alloy AW2014 exposed to subsonic speeds of pulsating water jets.
Wear. 488-489, JAN (2022), č. článku 204136. ISSN 0043-1648. E-ISSN 1873-2577
Grant CEP: GA ČR(CZ) GA19-00408S
Institucionální podpora: RVO:68081723 ; RVO:68145535
Klíčová slova: Pulsating water jet * Erosion * Water volume element * Material integrity * Compressive stress * Dislocations
Obor OECD: Mechanical engineering; Mechanical engineering (UGN-S)
Impakt faktor: 5, rok: 2022
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0043164821005202?via%3Dihub

This study focuses on the analysis of the surface material integrity of the polished, rigid, solid surface of an
aluminium alloy after periodical impingement of liquid droplets with variable volume and impact frequency
distributions normal to the solid surface. The volume of water droplets was determined for the pressures of 20
and 40 MPa. By increasing the traverse speed of the ultrasonic pulsating water jet head with respect to the
stationary tested specimen, the number of water droplet impacts on one area was controlled in order to reach the
early erosion stages. Also, for the comparative study, aluminum alloy was exposed to continuous water jet for
both supply pressure 20 and 40 MPa with traverse speed of 1 mm/s over the material surface. Systematic testing
focused on material integrity in the early erosion stages in the interval between the elastically deformed surface
and material disintegration was conducted with the aid of microhardness measurements, X-ray analysis of stress
state, and microstructural analysis by SEM. The motivation for carrying out this experiment was to verify the
effects of periodic drops on the integrity of the material and to identify the parameters leading to surface
strengthening without erosion as compared to continuous jet. Such surface treatments can improve fatigue life,
similarly to shot peening.
Trvalý link: http://hdl.handle.net/11104/0324722