Investigation of sandstone erosion by continuous and pulsed water jets

0504926 - ÚGN 2020 RIV US eng J - Journal Article
Raj, P. - Hloch, Sergej - Tripathi, R. - Srivastava, M. - Nag, A. - Klichová, Dagmar - Klich, Jiří - Hromasová, M. - Muller, M. - Miloslav, L. - Chattopadhyaya, S. - Adamcik, P.
Investigation of sandstone erosion by continuous and pulsed water jets.
Journal of Manufacturing Processes. Roč. 42, June 2019 (2019), s. 121-130. ISSN 1526-6125. E-ISSN 2212-4616
R&D Projects: GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : continuous water jet * pulsed water jet * erosion
OECD category: Mechanical engineering
Impact factor: 4.086, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S1526612518313525?via%3Dihub

The study compares the sandstone erosion manifestations (depth, width, and volume of the removed material)
caused by continuous and pulsed water jets (WJs) with a frequency f=20 kHz and 40 kHz. The WJ head follows
an inclined trajectory at an angle of 45° to the horizontal surface. The starting point of the head was positioned 5
mm above the sandstone surface. The traverse speed of the head was varied from v = 0.25 mm/s to 1 mm/s. The
structural changes and plastic deformation caused by the mechanical effect of the continuous and pulsed WJs
were analysed using SEM and optical profilometer. The results showed that an optimal standoff distance was
responsible for the maximum erosion effect under both continuous and pulsed regimes. The PWJ at f= 40 kHz
showed better erosion performance in terms of depth (6.8 mm), width (6.83 mm) and volume removed
(27.31mm3) as compared to PWJ at f=20 kHz and CWJ. The microstructural topography at varying standoff
distance (z=10 mm to 45 mm) showed erosion features such as micro-pits, cracks, perforated holes responsible
for different erosion stages. On-line monitoring via means of acoustic emission was measured to evaluate the
erosion phenomenon on the sandstone surface during the impact of the PWJ and CWJ. The correlation between
the acoustic emission results and the erosion parameters showed the progression of the erosion process under
different technological conditions.
Permanent Link: http://hdl.handle.net/11104/0296461