Wyniki wyszukiwania - BazTech

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Load condition analysis of pipe flange connection with gasket flat gasket and loose clamping rings

Wróbel Gabriel, Walczak Kazimierz

Journal of Achievements in Materials and Manufacturing Engineering

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2022

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Vol. 111, nr 1

5--17

EN

Purpose: This paper describes the study of the connection with loose fixing composite rings of pipe flanges. The elastic properties of the joint components - gasket, pressure flanges, rings and fixing bolts were determined experimentally. Design/methodology/approach: The criterion of joint tightness was formulated. The constructed model was used to determine the analytical dependence of the joint leakage pressure on the assembly torque of bolts tightening. The correctness of the model was confirmed by the agreement of the analytical results with the experimental results. Findings: Quantitative characteristics were determined for the selected type of joint. Practical implications: The formulated conclusions indicate the possibility of using the model to support the design process and to select the structural parameters of the joint meeting the operational requirements and safety criteria. Originality/value: Produced with recycled materials using.

2

Composite materials for warship constructions

Kyzioł Lesław

Journal of KONES

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2019

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Vol. 26, No. 4

135--140

EN

The article presents the basic properties of composite materials used for the construction of special ships. Static and dynamic characteristics of materials such as wood and polyester-glass composites are presented. Noteworthy are materials such as surface modified wood and polyester-glass composites with the addition of recyclate. Composite materials are widely used materials for the construction of non-magnetic warships. The article describes the properties of surface modified wood with polymethyl methacrylate and a polyester-glass composite with the addition of recyclate. The recyclate is fragmented, milled polyester-glass scrap. The content of the recyclate greatly affects the mechanical properties of the composite. The properties of the composite with the addition of recyclate depend on the recyclate content as well as the production technology and size of the recycled granulates. The test results showed that the increase in the recycled content causes a decrease in the mechanical properties of the composite. However, it should be remembered that these materials originated from waste, waste that is not subject to self-degradation, which have a very negative impact on the natural environment. At present, where there is a very large pollution of the natural environment, the processing and management of huge amounts of composite waste is an essential goal. A significant amount of recyclate significantly reduces the mechanical properties of the composite; however, the same large amount of recycled material has been transformed and used. The manufactured material and its structural elements are still non-magnetic structures and can be used on a less loaded element. The choice of material for the construction of special ships elements is determined not only by its properties but also by knowledge, experience, method of processing, economic and technical risk.

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Ocena jakości nawijanych kompozytów polimerowych na podstawie współczynnika dyfuzyjności cieplnej

Szymiczek M.

Modelowanie Inżynierskie

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2017

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T. 34, nr 65

125--131

PL

Celem pracy była ocena wpływu procesu degradacji starzeniowo-zmęczeniowej na dyfuzyjność cieplną kompozytu poliestrowo-szklanego. Dyfuzyjność cieplną określono na podstawie termowizyjnych map rozkładu temperatur na powierzchni próbki (metoda transmisyjna), opierając się na procedurze opracowanej przez Parkera. Zmiany strukturalne określono pośrednio na podstawie pomiaru chłonności wody. Dla potwierdzenia zmian właściwości użytkowych kompozytów przeprowadzono badania wytrzymałości na zginanie. Stopniowy spadek wytrzymałości na zginanie, modułu sprężystości oraz zwiększenie odkształcenia są wynikiem zmian strukturalnych, będących efektem degardacji zmęczeniowej. Stwierdzono, że dyfuzyjność cieplna obniża się wraz z postępującym procesem degardacji, co pozwala diagnozować stan materiału kompozytowego podczas eksploatacji.

EN

The aim of work was to evaluate the influence of aging-fatigue degradation process on thermal diffusivity of polyester-glass composite. Thermal diffusivity was determined based on thermovision maps of temperature distribution on the sample surface (transmission method) in accordance with the procedure developed by Parker. Structural changes were determined indirectly based on measuring the water absorption. The flexural strength tests were performed to confirm changes of composites properties. Gradual decrease in flexural strength, modulus of elasticity and increased strain are the result of structural changes due to fatigue degradation. It was found that thermal diffusivity decreases with the progressive process of degradation, which allows to diagnose composite material during exploitation.