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2 Advances in Science and Technology. Research Journal

2 2023

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Numerical Study of the Natural Oscillations of Perforated Vibrating Surfaces with Holes of Complex Geometry

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Kharchenko S. , Samborski S. , Kharchenko F. , Paśnik J.

Advances in Science and Technology. Research Journal

2023

tom Vol. 17, no 6

73--87

The widespread use of perforated vibrating surfaces in various industries requires maximum productivity and construction reliability. The research task is to determine the significant factors and their degree of influence on the natural oscillations of vibrating surfaces with multiple holes of complex geometry. For this purpose, studies were carried out for three samples of plates: non-perforated, with basic round holes and holes of complex geometry in the form of a five-petal epicycloid. Studies of the natural oscillations of perforated vibrating surfaces have been conducted using the finite element method in Abaqus, which has proved sufficient accuracy of calculations. The dependencies of the natural oscillation frequency of perforated surface samples on their thickness, partition width between the holes, material type, and fixing method have been obtained. In addition, the analysis involved the study of eight modes of oscillation common in practice. The dependencies of the natural oscillation frequency of perforated surface on the relative parameters of ligament efficiency and stiffness coefficient have also been obtained. These parameters take into account the ratios of the partition width between the holes to the plate thickness and the dimensions of the holes. The research results allow to obtain levels of influence of the perforated vibrating surface parameters on their natural oscillations frequency. The obtained research results make it possible to further determine the absence of damage between the holes and predict the durability of perforated vibration surfaces in the presence of holes of complex geometry.

Experimental Research in the Aspect of Determining the Mechanical and Strength Properties of the Composite Material Made of Carbon-Epoxy Composite

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Różyło P. , Smagowski W. , Paśnik J.

Advances in Science and Technology. Research Journal

2023

tom Vol. 17, no 2

232--246

The present paper, provides a study of conducting experimental investigations (based on the ISO standards), in the context of determining material properties (mechanical and strength parame-ters) in the case of thin-walled composite structures - made of carbon-epoxy composite. Tests were carried out on 5 different types of test specimens (in accordance with the standards), with a minimum of 9 specimens per each type of test. The tests provided high repeatability of results, and the large number of test specimens per each test made it possible to precisely average the test results in terms of determining the necessary material properties. The tests were carried out using a Zwick Z100 universal testing machine (UTM), under room temperature conditions, using two types of test heads that allow static experimental tests. The results presented in this paper con-stitute a prelude to research within the framework of the project from the National Science Centre (Poland) with the number 2021/41/B/ST8/00148. The paper presents the initial stage of the im-plementation of the aforementioned project - which was the determination of material parameters of the composite material from which the target thin-walled composite structures with closed sections were made.