Institute of Physics of Materials AS CR, v. v. i. > Projects > Material integrity and structure at the early stages during pulsating liquid jet interaction

Material integrity and structure at the early stages during pulsating liquid jet interaction

Co-investigatorprof. Mgr. Tomáš Kruml, CSc.
Number of Project19-00408S
AgencyGrantová agentura České republiky
Duration2019-01-01 - 2021-12-31

Anotace
The technology of material cutting by water jet is commonly applied. Effects of continuous water jet on metal materials are not significant, as the cutting is caused by material removal by abrasives. Equipment with patented parts was developed at the Institute of Geonics which enables to break the water jet into vortex rings (pulsating water jet, PWJ). The PWJ hits the surface of the target material at higher impact pressure (hammering effect) compare to continuous water jet (CWJ). Therefore, we propose to investigate the effects of PWJ on surfaces of metal materials. First experiments indicate that appropriate application of PWJ initiates deformation of surface layers and affects the fatigue life. PWJ has likely the same effect as shot peening. We plan to apply PWJ on the surface of 2 materials and specify changes on material surface and in surface layer using the X-ray diffraction, microhardness measurement, profilometry and electron microscopy (SEM, TEM). In parallel, fatigue tests will be carried out to set ideal parameters of PWJ in order to extend the lifetime of materials.


2020

Hloch S., Srivastava M., Nag A., Müller M., Hromasová M., Svobodová J., Kruml T., Chlupová A.: Effect of pressure of pulsating water jet moving along stair trajectory on erosion depth, surface morphology and microhardness. Wear 452-453 (2020) 203278