The article deals with the problem of selection of materials for two-component armored shields of motor vehicles. It is indicated how the Florence model can be used for practical purposes in the design process of the vehicle protective system and reduce the number of material combinations in ballistic verification tests. The procedure in configuring the shield for the assumed “a priori” protective and mass properties relevant to vehicle mobility is discussed. The method of configuring the above-mentioned materials is presented on the example of two-component shields in the combination of ceramic substrate of aramid and ceramic substrate of polyethylene type UHMWP. The level of protection according to the Nato Stanag 4569 document and the surface density of the shield were assumed. The selected configurations were verified in ballistic tests by determining the value of the V50 parameter. This research confirmed the possibility of using the Florence model to design simple two-component shields and reduce the number of configurations in ballistic tests confirming the assumed protection level by determining the V50 parameter.
Na podstawie wzorów empirycznych oraz badań na modelu laboratoryjnym przedstawiono analizę wpływu koncentracji objętościowej fazy stałej hydromieszaniny na jej straty hydrauliczne oraz prędkość graniczną. Badano koncentracje objętościowe: 5,10 i 15%.
EN
The article presents an analysis of the impact of sand volume concentration of the hydro-mixture's solid phase on its hydraulic losses and terminal velocity, based on empirical formulas and a laboratory model examination. The following volume concentrations were analyzed: 5,10 and 15%.
The paper is concerned with measurements of transient adhesion skimming with a rotating cylinder. The skimmer capacity is known to drop sharply as the skimming velocity exceeds a certain limit. Experiments carried out on layers of liquids of different viscosities at variable immersion depth of the cylinder made it possible to determine the corresponding limit velocities as a function of the thickness of liquid layer.
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