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Subsurface microtunneling in ductile material caused by multiple droplet impingement at subsonic speeds
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SYSNO ASEP 0555114 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Subsurface microtunneling in ductile material caused by multiple droplet impingement at subsonic speeds Author(s) Hloch, Sergej (UGN-S) RID, SAI, ORCID
Souček, Kamil (UGN-S) RID, ORCID
Svobodová, J. (CZ)
Hromasová, M. (CZ)
Müller, M. (CZ)Number of authors 5 Article number 204176 Source Title Wear. - : Elsevier - ISSN 0043-1648
Roč. 490-491, February 2022 (2022)Number of pages 13 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords hydrodemolition ; periodic water impingement ; lateral flow ; subsurface erosion ; transient cavities ; blind cavities ; pulsating water jet ; fractal erosion patterns ; hydraulic penetration Subject RIV JR - Other Machinery OECD category Mechanical engineering R&D Projects LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UGN-S - RVO:68145535 UT WOS 000754298000001 EID SCOPUS 85120326860 DOI 10.1016/j.wear.2021.204176 Annotation This article deals with the analysis of the subsurface deformation effects of materials due to the periodic action of liquid droplets, each with a constant volume of approximately 36 mm(3) distributed with a spatial frequency of 20,000 i/mm. Sample grooves were analyzed within standoff distances where the prevailing mechanism is acceleration culmination depletion using the stair trajectory to avoid a possible Doppler effect. Using X-ray mu-CT, a network of cavities corresponding to a fractal shape was identified below the surface. It is apparent that the ability to erode does not end with the formation of a groove but continues into the core of the material in the form of microjetting, tunneling, or piercing. From that perspective, two types of these cavities have been identified, blind and transient, with diameters of a few micrometers. The topological changes in the subsurface region of the sample were analyzed using X-ray tt-CT progressive sectioning. The anticipated subsurface deformation was further explored and analyzed using SEM analysis. The integrity of the material around the cavities was assessed according to microhardness to explain the microjetting, tunneling, and piercing propagation. The results suggest that the effect of the lateral jetting after droplet collapsing causes extensive hydrodynamic tunneling in the material that is much higher during the intense periodic action of water droplets, even at subsonic speeds. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2023 Electronic address ttps://reader.elsevier.com/reader/sd/pii/S0043164821005597?token=92436CDCC65473A199B70C2D6D7DC0D776F87E1C4A9418AE2F42DA1EA4D578329AEEF1DEAD1443F6E0B23FC53EF80A6E&originRegion=eu-west-1&originCreation=20220425120439
Number of the records: 1