| Project/Area Number |
02555034
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Fukui University |
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Principal Investigator |
IWAI Yoshiro Fukui University, Engineering, Professor, 工学部, 教授 (40115291)
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| Co-Investigator(Kenkyū-buntansha) |
OKAZAKI Shozo Kawasaki Heavy Industries, LTD., Technical Institute, Manager, 技術研究所, 課長
OKADA Tsunenori Fukui University, Engineering, Professor, 工学部, 教授 (40020185)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1991: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1990: ¥5,400,000 (Direct Cost: ¥5,400,000)
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| Keywords | Material testing / Slurry wear / Cavitation erosion / Combined damage / Nozzle jet wear test / Vibratory cavitation erosion test / Solid particle |
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| Research Abstract |
1. A new test apparatus was constructed by combining an ultrasonic vibratory cavitation device and a slurry jet device in order to study combined damages with slurry wear and cavitation erosion. Experimental results were obtained as follows.
(1)When cavitation and slurry erosions are combined, the damage loss increases in proportion to time without an incubation period because solid particles remove the surface successively and does not coincide with simple summation of each damage loss. Under low jet flow velocity, cavitation erosion is reduced by solid particles. When jet flow velocity is high, cavitation bubbles flow out from the surface and the solid particles remove the plastic deformations in which produce the erosion debris, thus the cavitation erosion is diminished.
(2)Cavitation erosion increases in water containing solid particles. The degree of the increase of damage is larger for angular particles such as abrasives and silica sands than glass beads. With increasing particle size, the damage shows a maximum at a given value and decreases.
2. The test method which slurry jet containing cavitation bubbles acts on the stationary specimen was developed. The combined damage is larger than slurry wear.
3. An air-blast erosion test apparatus was constructed in order to investigate the characteristics of wear caused by a stream of impinging solid particles. The wear of materials by impacts of solid particles at room and high temperatures could be estimated from the impinging conditions and the properties of materials and particles.
From these results, it is found that the test apparatuses developed in this study are very useful to investigate the slurry wear and the damages combined with slurry wear and cavitation erosion.
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