Pulsating water jet erosion effect on a brass flat solid surface

• Published in: International journal of advanced manufacturing technology 2018-07, Vol.97 (1-4), p.1099-1112
• Main Authors: Lehocká, D., Klich, J., Botko, F., Foldyna, J., Hloch, S., Kepič, J., Kovaľ, K., Krejči, L., Storkan, Z.
• Format: Article
• Language: English
• Subjects: CAE) and Design; Computer-Aided Engineering (CAD; Deformation; Design of experiments; Disintegration; Engineering; Erosion; Factorial design; Grooves; Hydraulic jets; Hydraulics; Industrial and Production Engineering; Mathematical analysis; Mechanical Engineering; Media Management; Nozzles; Orifices; Original Article; Power efficiency; Scanning electron microscopy; Solid surfaces
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-018-1882-4

The present study is focused on the disintegration effect of ultrasound-enhanced pulsating water jet (PWJ) technology on brass CW614N. The first part of the study discusses the effect of a combination of factors based on the full factorial design of experiments (DoE) 3 3 . Traverse speed v (mm s −1 ), circular nozzle orifice diameter d (mm), and hydraulic power P h (kW) are selected as the disintegration variable factors. Mass material removal Δm (mg s −1 ) is evaluated based on the change in these variable factors. In the next part, a verification experiment is performed with by varying the traverse speed between 0.2 and 1.4 mm s −1 . The mathematical model calculated in DoE is confirmed. Moreover, the significant effect of hydraulic power P h (kW) on the efficiency of the PWJ disintegration is demonstrated. The last part of the study discusses the surface and subsurface effects on a PWJ after brass CW614A erosion. A sample disintegration with hydraulic power P h  = 13 kW and circular nozzle diameter d  = 1.321 mm is observed. Optical profilometry and scanning electron microscopy are performed to visualise the surface erosion of a selected groove. A significant mass material removal is observed from the groove surface, and the disintegrated surface is characterised by erosion and crater formation. A slight cold deformation with a maximum depth of 200 μm is detected in the subsurface layer. The experiment and results present a part of an extensive research focused on describing the PWJ disintegration efficiency for metallic materials.