“Jet-in-slit” was used for erosion-corrosion tests on 6/4 yellow brass in a 3% sodium chloride solution together with free jet and submerged jet (common nozzle diameter of 1.6 mm). The latter jets are typical testing methods for evaluating the resistance of alloys to erosion-corrosion. Each specimen sustained a characteristic damage on its surface after 24-h running under common flow rate (0.4 L/min) of the test liquid. The most critical damage occurred on the jet-in-slit specimen.
Measurements through hydrodynamic as well as electrochemical techniques have proved that on a free jet specimen, the damage occurs only on the place of maximum shear stress, and on the submerged jet and jet-in-slit specimens occurs not only at the place of maximum shear stress but also at a place downstream where the flow velocity is considerably low but where impulsive pressure occurs intermittently. Based upon the experimental results obtained, the authors recommended the jet-in-slit for a standard testing method of erosion-corrosion resistance.
A system usinga vibratory probe oscillating in close proximity to a specimen surface was improved in order to study the effects of tensile stress on the initial stages o f cavitation damage: the temperature distribution on the stationary specimen came within f 0.3 "C, and the errors in the experimental results were able to be kept below f 3%.A tensile stress applied on such ductile metallic materials as aluminum, iron (ferrite) and mild steel inhibits cavitation damage in the early stage: the incubation period was extended to a maximum of five times. However, the damage is accelerated in the stage affected with weight loss. A n applied tensile stress on such brittle material as cast iron accelerates damage both in the incubation period and the following periods of damage.of tensile stress on cavitation damage has been discussed.The mechanism o f these favorable and unfavorable effects
In this study we Inake clear the character 三 stics of an air suspension with a viscous or orifice restriction and a reservoir 撫 k. We can choose the optimal value of flow coeMcient of Viscous restriction to minirnize resonance amplitude . The maximu 【n value of the transfer fullc 七 ion doesn , t depend on the osclllating amp 廴 itude in case of the viscous restrictioll , However , it depends on the oscillating amplitude in ca8e of the orifice restriction , Thus , an a 主 r suspellsioll witll a viscous restriction is better f6r isolating the smaU vibratiol1 , ill case of the high precision machinery .
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