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1

Surface Imaging of Temperature – Research Method of Heat Transfer

Szafran Krzysztof, Łusiak Tomasz, Jeziorek Łukasz, Korzec Izabela

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 1

243--251

EN

The method does not differ in difficulty from the standard surface temperature imaging method, which is its unquestionable advantage. The disadvantage is the need to use test models made of materials transmitting visible light in the full range (blue light for excitation and red as a recorded result), which, with more complex shapes, makes the model more expensive. Nevertheless, the presented method is a valuable supplement to the set of methods and techniques used so far for imaging temperature fields and estimating the heat flux in the steady state.

2

Application of the Acoustic Emission Technique for Damage Identification in the Fiber Reinforced Polymer Composites

Samborski Sylwester, Korzec Izabela

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 1

210--221

EN

A set of experiments having in target determination of fracture resistance was performed on the Fiber Reinforced Polymer (FRP) composites specimens with an additional monitoring of damage onset and evolution with a so-called Acoustic Emission (AE) technique. The AE technique is a non-destructive material testing method, which enables registering the phenomena usually not audible with a human ear - the frequency bands lay between 100 and 1000kHz. For the FRP composites this enables monitoring various damage phenomena - matrix cracking, delamination, fiber cracking etc. by acquisition and subsequent analysis of several AE parameters: number of hits, number of counts, amplitude or energy of the signal. In the paper advantages of a deeper analysis of the raw AE signal was presented with an application of the Fast Fourier Transform (FFT), leading to a more detailed damage identification along the whole loading procedure. The study proved the usability of the AE method in damage monitoring of the FRPs; a bundle of illustrative examples of chosen acoustic emission parameters’ evolution displayed on the background of the load applied to composite specimens was presented and interpreted.

3

A Study on Mechanical Strength and Failure of Fabric Reinforced Polymer Composites

Korzec Izabela, Samborski Sylwester, Łusiak Tomasz

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 2

120--130

EN

The paper presents a study on influence of different fabric weave and fabric orientation on strength properties of fiber reinforced polymer composites. The research concerns materials used in a new type of rotorcraft. Four series of laminates were fabricated with hand forming, using the MGS L285/H285 epoxy resin. Triple-kind experiments were performed: the Shore hardness measurements, tensile strength testing and fractographic analysis. The specimens of different series shown various strength and stiffness characteristics, depending on the type of weave and fabric layup. Three different failure schemes were observed. The Poisson coefficient was different among series, as well, but no understandable link to specimen morphology could be found so far. Fractographic observations suggested intralaminar delamination.

4

Tests of selected mechanical properties of welded joints in rotorcraft

Korzec Izabela, Łusiak Tomasz, Bugaj Martin

Transactions on Aerospace Research

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2021

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Nr 1 (262)

64--74

EN

The following article presents experimental use of different ways of inguinal connecting of aircraft elements using TIG (Tungsten Inert Gas), MAG (Metal Active Gas) and arched coated electrode. The object of the research were samples of rotorcraft elements, which were connected to each other by TIG, MAG methods and the coated electrode. The main aim of the research was to determine selected mechanical properties in particular hardness and strength of inguinal joints and then, based on the tests carried out, the best methods were selected.

PL

W niniejszym artykule przedstawiono eksperymentalne zastosowanie różnych sposobów łączenia pachwinowego elementów statku powietrznego metodą TIG (Tungsten Inert Gas), MAG (Metal Active Gas) oraz elektrodą otuloną łukową. Przedmiotem badań były próbki elementów wiropłatów, które połączono ze sobą metodami TIG, MAG oraz elektrodą otuloną. Głównym celem badań było określenie wybranych właściwości mechanicznych w szczególności twardości i wytrzymałości spawów pachwinowych, a następnie na podstawie przeprowadzonych badań wybrano najlepsze metody.