The New Test Method for High Velocity Water Jet Impact

The regularity of the erosion wear of a surface of a brittle polymeric material under the conditions of high-pressure (high-velocity) water-jet impact was examined using the atomic-force microscope. Investigations results proved that the elementary mechanism of erosive failure of brittle polymers in response to pressure and cyclic loads at micro and nanolevel may have brittle character, as well as elastoplastic and plastic character under severer regimes. The process of hardening of the fine (nanolevel) superficial layers of PMMA material has been determined in conditions of high-velocity water-drop loading.

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Analysis and design of a water pump with accumulators absorbing pressure pulsation in high-velocity water-jet propulsion system

Journal of Marine Science and Technology ◽

10.1007/s00773-015-0311-8 ◽

2015 ◽

Vol 20 (3) ◽

pp. 551-558 ◽

Cited By ~ 6

Author(s):

Luo Xiaohui ◽

Cao Shuping ◽

Shi Weijie ◽

He Xiaofeng

Keyword(s):

High Velocity ◽

Pressure Pulsation ◽

Water Jet ◽

Propulsion System ◽

Water Pump ◽

Jet Propulsion ◽

Analysis And Design ◽

Velocity Water

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Testing of the High-Velocity Water Jetting on Concrete Samples Inside the Overpressure Vessel

Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition ◽

10.1115/pvp2009-77712 ◽

2009 ◽

Author(s):

Libor M. Hlava´cˇ ◽

Lenka Bodna´rova´ ◽

Vile´m Ma´dr ◽

Rudolf Hela ◽

Jirˇi´ Kalicˇinsky´ ◽

...

Keyword(s):

Water Level ◽

High Velocity ◽

Water Jet ◽

Practical Application ◽

Disintegration Rate ◽

Natural Conditions ◽

Application Range ◽

Laboratory Techniques ◽

Further Development ◽

Velocity Water

The concrete samples with various erosion states were disintegrated inside the overpressure vessel using high-velocity water jet. Their erosion states were prepared by application of several laboratory techniques simulating the concrete aging under the natural conditions due to the real applications in practice. The influence of the erosion state on the disintegration rate was tested and the surface topography was studied both prior the application of water jet and post it. The water jet was applied in the overpressure vessel used for simulation of pressures equivalent to the submersion to several depths under the water level. Usual experimental scale responsive to the national practical application range was from the depth of submersion close to the water level up to the depth about 100 meters with the 20 meters step. Nevertheless, the data were obtained for overpressures equivalent to the submersion levels up to 140 meters enlarging so the range of results useful for regression analysis of the physical trend. Several samples were tested even in overpressures simulating depth of submersion equal to 160 meters and more. Few samples of special decorative concretes were also studied and special techniques of their working up were prepared and tested. All results are discussed regarding their application in practice and further development of special routings.

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