17 research outputs found

    The numerical analysis of wooden structure as orthotropic structure

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    Praca prezentuje analiz臋 drewnianych element贸w dwuteowych powsta艂ych przez 艂膮czenie gwo藕dziami. Ustalono maksymaln膮 si艂臋 艣ciskaj膮c膮 s艂up, zginaj膮c膮 belk臋 oraz ugi臋cie belki. Por贸wnano warto艣ci uzyskane przez obliczenia analityczne oraz model metody element贸w sko艅czonych (MES). Materia艂 traktowano jako spr臋偶ysty z izotropow膮 oraz ortotropow膮 struktur膮.This paper presents an analysis of the elements of wood I-beam connected with nails. Set the maximum compressive forces on pole, bending beam and the beam displacement. Compared to the values obtained by calculation based on standards and the model of the Finite Element Method. Material was treated as an elastic one with isotropic and orthotropic structure

    Numerical analysis of temperature distribution in outside vertical compartment

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    W pracy przedstawiono analiz臋 zewn臋trznej przegrody pionowej. Poprzez wsp贸艂czynnik przenikania ciep艂a, wyznaczony analitycznie, okre艣lono charakterystyk臋 ochrony cieplnej przegrody. Wykorzystuj膮c symulacje komputerowe, wyznaczono rozk艂ad temperatury w przegrodzie oraz czas potrzebny do uzyskania stanu ustalonego. Analiz臋 numeryczn膮 przeprowadzono za pomoc膮 programu ADINA System opartego na metodzie element贸w sko艅czonych.The paper presents the analysis of external wall. Based on heat transfer coefficient, the characteristics of the thermal protection of wall was defined. The heat transfer coefficient was estimated by analytical method. The temperature distribution in the partition and time required to achieve steady state were determined by numerical methods. The ADINA System based on the Finite Element Method (FEM) was used for the calculations

    The application of FSW technology in aluminum structures

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    W pracy om贸wiono zastosowanie technologii zgrzewania tarciowego z mieszaniem do budowy aluminiowych struktur lotniczych. Przedstawiono spos贸b badania z艂膮czy FSW w celu okre艣lenia wytrzyma艂o艣ci na rozci膮ganie. Dokonano oceny mikrostruktury z艂膮cza. W celu okre艣lenia obci膮偶e艅 dzia艂aj膮cych na z艂膮cze FSW przeprowadzono obliczenia numeryczne. W pracy podano wyniki analizy numerycznej fragmentu struktury aluminiowej stosowanej w konstrukcjach lotniczych. Analiz臋 numeryczn膮 przeprowadzono dla dw贸ch kategorii struktur, r贸偶ni膮cych si臋 geometri膮. Pierwsza analizowana struktura zbudowana jest z arkusza blachy, ramek, pod艂u偶nic i podp贸rek. Druga analizowana struktura sk艂ada si臋 z blachy, pod艂u偶nic i podp贸rek. W ka偶dej kategorii analizowanych struktur rozwa偶ano model powierzchniowy i obj臋to艣ciowy. Oceniano przemieszczenia oraz napr臋偶enia w warunkach obci膮偶enia ci艣nieniem dzia艂aj膮cym prostopadle do powierzchni blachy.The paper discusses the application of friction stir welding technology for the construction of aluminum aircraft structures. The method of testing FSW welds to determine their tensile strength is presented. An assessment of the weld microstructure was conducted. To determine the loads acting on the FSW weld, numerical calculations were carried out. This paper presents the results of numerical analysis of a part of the aluminum structure used in aircraft construction. Numerical analysis was carried out for two categories of structures with different geometry. The first analyzed structure is made of sheet metal, frames, stringers and supports. The second analyzed structure consists of sheet metal, stringers and supports. Within each of the analyzed structures, surface and volume models were considered. Displacement and stress were evaluated in conditions of pressure load acting perpendicularly to the sheet surface

    Deformacja plastyczna wybranych po艂膮cze艅 RFSSW podczas rozci膮gania

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    The dynamic development of the friction stir welding (FSW) technology is the basis for the design of durabe joints inter alia in the aviation industry. This technology has a prospective application, especially for the aluminum alloys. It is suitable for a broad spectrum of permanent joints. The joints obtained by FSW technology are characterized by good mechanical properties. In this paper, the friction stir spot welding joints were analysed. The example of a structure made using this technology were presented. The lap joints made of 2mm Al 6061-T6 sheets were the investigation subject. The different spot welds arrangements were analysed. The tensile test were performed with optical deformation measurement system, which allow to obtain the plastic deformation field on the sample surface. The plastic strain graphs for the characteristic line passing through the maximum deformation were registered and presented. The experimental results were compared to the FEM numerical analysis. The numerical models were built with 3D-solid elements. The boundary conditions, material properties and geometry of the joints were identical as during experimental investigation. The mechanism of deformation of welded joints during tensile test was described and explained. It has been found that the arrangement of the spot welds with respect to the tensile direction has an important influence on the behaviour and deformation of lap joint.Dynamiczny rozw贸j technologii zgrzewania tarciowego z mieszaniem (FSW) jest podstaw膮 do projektowania wytrzyma艂ych po艂膮cze艅 mi臋dzy innymi w przemy艣le lotniczym. Technologia ta, szczeg贸lnie dla stop贸w aluminium, ma perspektywiczne zastosowanie. Nadaje si臋 do wykonywania szerokiego spektrum po艂膮cze艅 nieroz艂膮cznych. Po艂膮czenia uzyskane przy u偶yciu tej technologii cechuj膮 si臋 dobrymi w艂a艣ciwo艣ciami mechanicznymi i u偶ytkowymi. W pracy analizowano po艂膮czenia uzyskane przy u偶yciu technologii punktowego zgrzewania tarciowego z mieszaniem (RFSSW). Zaprezentowano przyk艂ad elementu konstrukcji wykonanej przy u偶yciu tej technologii. Przedmiotem bada艅 w pracy by艂y po艂膮czenia zak艂adkowe wykonane z 2mm blachy Al 6061-T6. Po艂膮czenia zgrzewane r贸偶ni艂y si臋 u艂o偶eniem zgrzein punktowych. Pr贸bki rozci膮gano na maszynie wytrzyma艂o艣ciowej, jednocze艣nie dokonuj膮c pomiaru przy u偶yciu optycznego systemu pomiaru deformacji. Przy u偶yciu tego systemu uzyskano pole odkszta艂ce艅 plastycznych na powierzchni rozci膮ganej pr贸bki. Zarejestrowano i przedstawiono wykresy odkszta艂ce艅 plastycznych dla charakterystycznych linii przechodz膮cych przez maksimum odkszta艂cenia. Wyniki bada艅 do艣wiadczalnych odniesiono do przeprowadzonej analizy numerycznej MES. Model numeryczny zbudowano z element贸w typu 3D solid. W modelu odwzorowano warunki brzegowe przeprowadzonej pr贸by, w艂a艣ciwo艣ci materia艂u i geometri臋 z艂膮cza. Opisano i wyja艣niono mechanizm deformacji z艂膮cz zgrzewanych podczas rozci膮gania. Stwierdzono, 偶e po艂o偶enie zgrzein w stosunku do kierunku rozci膮gania ma istotny wp艂yw na prac臋 i deformacj臋 po艂膮czenia zak艂adkowego

    Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets

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    One of the important parameters of Refill Friction Stir Spot Welding is the so-called basic position of the tool. This is the arrangement of the pin and sleeve which occurs when the tool is plunged into the material. The basic positions can be divided into two categories. In the first category, the sleeve and the pin are above the sheet surface or below sheet surface and in the second category the pin is retracted within the sleeve or protrudes from it

    Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets

    No full text
    One of the important parameters of Refill Friction Stir Spot Welding is the so-called basic position of the tool. This is the arrangement of the pin and sleeve which occurs when the tool is plunged into the material. The basic positions can be divided into two categories. In the first category, the sleeve and the pin are above the sheet surface or below sheet surface and in the second category the pin is retracted within the sleeve or protrudes from it. The aim of the work was to test four settings of the basic position, and then determine the best setting of the basic position, without changing the other welding parameters. Joints made of an aluminum alloy 2024-T3 sheet having a thickness of 1.0 mm and an aluminum alloy D16UTW sheet having a thickness of 0.6 mm were analysed. The best setting of the basic position was determined based on assessment of the force carried in shear test, macrostructure and weld face of the joints
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