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Wielokryterialna ocena wybranych rozwiązań elewacji wentylowanych

Leśniak Agnieszka, Górka Monika

Materiały Budowlane

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2022

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nr 10

21--23

PL

Elewacje wentylowane stanowią alternatywę dla standardowych tynków elewacyjnych. Wykonuje się je z wykorzystaniem różnych płyt okładzinowych i konstrukcji rusztu. W artykule podjęto próbę wskazania najkorzystniejszego rozwiązania elewacji wentylowanej na podstawie przyjętych kryteriów oceny. Poddano analizie trzy warianty elewacji: z płyt aluminiowych przykręcanych do podkonstrukcji aluminiowej wkrętami samowiercącymi; z płyt kompozytowych zawieszanych na podkonstrukcji aluminiowej oraz z płyt włókno-cementowych nitowanych do podkonstrukcji. Do analizy wielokryterialnej wykorzystano metodę PROMETHEE II.

EN

Ventilated facades are an alternative to standard facade panels. It is made with the use of various materials for cladding panels and substructures. In the paper, the authors tried to determine the most advantageous solution for the execution of the ventilated facade on the basis of the 7 recognized evaluation criteria. Three variants of the facade were analysed: aluminium panels screwed to the aluminium substructure with self-drilling screws; composite panels suspended from the aluminium substructure; fibre-cement panels riveted for substructures for the multi-criteria analysis, the PROMETHEE II method was used.

2

Comparative Study on Mechanical Performances of Circular and Flat Geometry Welds in Friction Stir Welding of Aluminium Alloy

Senthil S. M., Ragu Nathan Seerangan, Parameshwaran Rathinasamy, Bhuvanesh Kumar M.

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 3

881--886

EN

This study is to find the extent of variation in mechanical properties between plate and pipe welds fabricated out of the same FSW process parameters. Common thickness of 3 mm along with similar tool specifications is used to fabricate the weld. Process parameters of tool rotational speed 2000 rpm and weld speed 94 mm/min that was defined as optimal for pipe weld is used as common process parameters. Welds are analyzed for hardness and tensile properties. Yield strength and ultimate tensile strength varied about 8.1% and 11.2% respectively between plate and pipe welds. The hardness of the stir zones varied about 11.6% between plate and pipe welds.

3

Buckling and bending properties of aluminium plate with multiple cracks

Mohmmed J. H., Mahmood N. Y., Ali M., Zainulabdeen A. A.

Archives of Materials Science and Engineering

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2020

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Vol. 106, nr 2

49--58

EN

Purpose: In this paper, the bending strength and buckling stability of (AA 7075-T6) aluminium plate weakened by many transverse cracks, which located at different positions, subjected to concentrated loads applied at the ends were analysed. Design/methodology/approach: Numerical modelling and calculation by the finite element method (ANSYS Package), for the critical load of bending and compression panel were estimated. Findings: It found that the variation of the critical stress in bending and buckling is proportional to the crack conditions (no. of crack and location). In general, the critical load in bending and buckling decreases with increasing the crack number in structure. Research limitations/implications: For both bending and buckling, two transverse cracks on one face of plate is more stable than two transverse cracks on opposite faces. Practical implications: In addition, many experimental tests were carried out by using an INSTRON test machine to obtain the buckling critical loads, where the experimental results were compared with the ones of the finite element method. Furthermore, bending strength was calculated theoretically for the cracked panel. Originality/value: Comparison between the experimental and numerical (FE based model) data and between the theoretical and nu-merical (FE based model) data for buckling and bending strength respectively indicate the precise and the simplicity of the developed models to determine the critical loads in such cases.

4

Experimental validation of equivalent circuit modelling of the piezo-stripe harvester attached to the sfsf rectangular plate

Koszewnik Andrzej

Acta Mechanica et Automatica

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2020

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Vol. 14, no. 1

8--15

EN

Plate-like structures with attached piezo-patch elements are widely used in marine, aerospace and civil infrastructure applications to power small devices with low power demand or used for monitoring of vibration structures. In order to assess the feasibility of an energy harvesting system to generate power output from a harvester, an accurate electromechanical model of the piezo-patch harvester attached to a 2D structure in modal coordinates is required. Taking into account this fact, this study is focused on the analysis of the piezoharvester orientations on the SFSF (Simply Supported-Free-Simply Supported-Free) plate undergoing forced dynamic excitation. The results obtained from the numerical analysis of a smart structure led to determining quasi-optimal piezo-harvester location on the structure, and next, to determining a multi-mode representation of the equivalent circuit model. The experimental set-up carried out on the lab stand properly verified the parameters of the ECM model. Finally, the proposed approach can be used for the structural health monitoring of vibration of some 2D mechanical structures like the front wall of a dishwasher.

5

Badanie determinizmu układów płytowych z zastosowaniem metody diagramów rekurencyjnych

Iwaniec J.

Modelowanie Inżynierskie

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2011

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T. 11, nr 42

163-170

PL

W pracy przedstawiono zagadnienia dotyczące badania determinizmu układów mechanicznych z zastosowaniem metody diagramów rekurencyjnych, której istotą jest wizualizacja rekurencyjności stanów badanych układów w przestrzeni fazowej. Metodę zastosowano do badania własności płyt aluminiowych: płyty nieuszkodzonej i płyty z pęknięciem, wzbudzanych do drgań za pomocą sygnałów harmonicznych o częstotliwościach pierwszej, trzeciej i szóstej postaci drgań własnych badanych płyt.

EN

The paper concerns research into determinism of mechanical systems with the use of the Recurrence Plots method. There are presented the results of Recurrence Plots method application to the research into properties of two aluminium plates (undamaged and cracked). The plates were excited to vibrations with the use of harmonic exciting signals of frequencies corresponding to the frequencies of their first, third and sixth natural mode shapes.

6

Metoda badania sił zgryzu wykorzystująca deformację plastyczną próbek z blachy aluminiowej.

Chladek W., Lipski T.

Inżynieria Materiałowa

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1998

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R. XIX, nr 2

57-59

PL

W pracy przedstawiono nową metodę pomiaru sił zgryzu opartą na zależności pomiędzy wielkością odcisku w blasze aluminiowej a siłą wgniatającą penetrator w kształcie kulki. Metodę sprawdzono dokonując badań klinicznych 120 osób. Uzyskane wyniki pozwoliły na ocenę rozkładu sił zgryzu wzdłuż łuku zębowego oraz określenie maksymalnych sił pomiędzy zębami trzonowymi i przedtrzonowymi.

EN

The work presents the new method of measuring the occlusion forces and the results of investigations in a group of 120 tested subjects. In the research the method based on interdependence between the plastic deformity and force indenting the spherical penetrator in the metal sample was implemented. The obtained results allowed to estimate the distribution of occlusion forces along the alverolar ridge and define the dimensions of the maximum forces applied while biting and gnawing.