Wyniki wyszukiwania dla: ADHESIVE JOINT - MOST Wiedzy

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Wyniki wyszukiwania dla: ADHESIVE JOINT

Wyniki wyszukiwania dla: ADHESIVE JOINT

  • Lamb wave propagation in a single lap adhesive joint

    Publikacja

    The aim of the paper is the analysis of Lamb wave propagation in adhesive joints. The research was performed on a single lap adhesive joint of two steel plates. Two types of joints, namely an intact and with defect were considered. In experimental investigations the condition assessment of the joint was performed with the use of antisymmetric Lamb waves excited by a plate piezo actuators and measured by a laser vibrometer. Numeri-cal...

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  • Monitoring of crosslinking of a DGEBA-PAMAM adhesive in composite/aluminium bonded joint using mechanical

    Publikacja
    • M. Budzik
    • B. Mascaro
    • J. Jumel
    • M. Castaings
    • M. Shanahan

    - INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES - 2012

    Adhesive cure is an important and determining aspect of strength and stability of bonded structures. Crosslinking of the polymer leads to the adhesive strength, stiffness and durability. Depending on the resin and curing agent used, cure time can vary from minutes to weeks, even then 100% crosslinking not being guaranteed. Standard methods based on dynamic mechanical analysis (DMA) or calorimetric techniques (DSC, DTA) are valuable...

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  • Damage Imaging in Lamb Wave-Based Inspection of Adhesive Joints

    Adhesive bonding has become increasingly important in many industries. Non-destructive inspection of adhesive joints is essential for the condition assessment and maintenance of a structure containing such joints. The aim of this paper was the experimental investigation of the damage identification of a single lap adhesive joint of metal plate-like structures. Nine joints with different defects in the form of partial debonding...

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  • Analysis of guided wave propagation in adhesive joints of steel rods

    Publikacja

    The aim of the study is the elastic wave propagation in adhesive joints of metal rods that are one of the simplest kind of glue connections. They are consisted of two metal members and an adhesive layer joining two parts together. The analysis is directed to technical diagnostics of such type of connections. Longitudinal and transversal guided waves were excited in prepared joints. Signals of propagating waves were registered in...

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  • Wave Frequency Effects on Damage Imaging in Adhesive Joints Using Lamb Waves and RMS

    Publikacja

    Structural adhesive joints have numerous applications in many fields of industry. The gradual deterioration of adhesive material over time causes a possibility of unexpected failure and the need for non-destructive testing of existing joints. The Lamb wave propagation method is one of the most promising techniques for the damage identification of such connections. The aim of this study was experimental and numerical research on...

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  • Reliable method of assessing fracture properties of asymmetric bonded joints

    Publikacja

    Two methods of assessing fracture properties of adhesive joints were studied. Two wedge tests: with continuous deflection and with force measurements were compared. Asymmetric geometry of the bonded joint was considered, i.e. two different plates of aluminium alloys: Al-Cu and Al-Mg, were bonded with epoxy DGEBA adhesive. The analytical model is shown to estimate the values of fracture properties: crack position and critical fracture...

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  • Experimentation, material modelling and simulation of bonded joints with a flexible adhesive

    Publikacja

    - INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES - 2012

    The paper deals with material parameters identification of a flexible adhesive and the numerical simulation of its behaviour in a single lap bonded joint. The material modelling was based on the simple shear and tensile-shear laboratory tests of the bonded joints made of thin aluminium and polyurethane plates with the flexible adhesive Terostat MS 9360 manufactured by Henkel AG & Co. The adhesive was considered as a hyperelastic...

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  • Fracture of aluminium joints bonded with epoxy adhesive reinforced by mmt nanoparticles

    Publikacja

    - Advances in Materials Science - 2009

    Crack propagation behavior was studied for aluminium/aluminum adhesive joints bonded with two epoxy adhesives: pure and reinforced with clay nanoparticles. The focus was also on the novel use of the constant displacement rate test to study adhesion/adhesives efficiency. The epoxy systems studied were: Epidian E6 produced from bisphenol A and epichlorohydrin, (''Organika -Sarzyna'' Poland); pure or strengthened with montmorillonit...

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  • Lamb wave-based monitoring of shear failure of an adhesive lap joint

    The paper presents a study on the elastic wave propagation in adhesive joints of steel plates subjected to tensile loading. A single lap joint was chosen for analysis because of its simplicity and plurality of applications. Experimental investigations consisted of the uniaxial extension of prepared specimens. Force and displacement values were recorded by a testing machine. Simultaneously, guided Lamb waves were excited and signals...

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  • Two tests for adhesive bonding long term characterization: principles and applications

    Publikacja
    • J. Jumel
    • M. Budzik
    • S. Chauffaille
    • M. Shanahan

    - Advances in Materials Science - 2011

    This article describes recent refinement of the traditional wedge test technique used to characterize durability of the adhesive joints. We propose two types of measuring protocols to monitor precisely and continuously the propagation of an "effective" crack during long term mode I fracture mechanic test. First method is directly derived from the traditional wedge test technique and consist in monitoring the surface strain of adherent...

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  • Fracture Energy of Bonded Joints with 2D Elastic Adhesive Layer

    Publikacja

    - Advances in Materials Science - 2010

    When bonded joint is subjected to mode I fracture loading, the adhesive joints analytical solutions treats the adhesive layer, usually, as not existing or 1D Hooke elastic layer. In the case of 1D elastic layer, represented as Hookes spring element, is acting, only, in direction contrary to the applied load. Basing on the information yielded from sensitive laser profilometry technique, where deflections of bonded part of the joint...

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  • Instrumented end notched flexure - Crack propagation and process zonemonitoring Part II: Data reduction and experimental

    Publikacja
    • M. Budzik
    • J. Jumel
    • N. Ben Salem
    • M. Shanahan

    - INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES - 2013

    A mode II instrumented end notched flexure three point bending (ENF) adhesion test is described. The adhesive joint consists of two aluminium alloy (AW7075-T6) plates bonded with a structural epoxy adhesive (Hysol EA 9395™). Strain gauges are attached to the outer surface (backface) of the substrates in the lengthwise direction to measure local surface strain during crack propagation. Simultaneously, load/displacement measurements...

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  • Detection of debonding in adhesive joints using Lamb wave propagation

    Adhesively bonded joints are widely used in many branches of industry. Mechanical degradation of this type of connections does not have significant symptoms that can be noticed during visual assessment, so non-destructive testing becomes a very important issue. The paper deals with experimental investigations of adhesively bonded steel plates with different defects. Five samples (an intact one and four with damages in the form...

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  • 4-Point beam tensile test on a soft adhesive

    Publikacja
    • M. Budzik
    • J. Jumel
    • M. Shanahan

    - MATERIALS & DESIGN - 2013

    An adhesive butt joint with a soft bondline has been studied. A series of experiments was conducted on test pieces constituted of aluminium adherends bonded with a low modulus epoxy adhesive, ScotchWeld™ 2216. The joint was subjected to four point bending, in tension/compression loading, under constant deflection rate, with the bondline being parallel to the applied load. The objective was to examine and evaluate crack nucleation...

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  • An in situ technique for the assessment of adhesive properties of a joint under load

    Publikacja

    - INTERNATIONAL JOURNAL OF FRACTURE - 2011

    Slow crack propagation in adhesive bonded joints has been characterised using an asymmetric wedge test. Crack position was evaluated from strain gauge measurements, both in the debonded partof the joint and in the bonded zone. Test temperature was changed during loading, giving insight into bond evolution. The technique allows accurate, and virtually continuous, determination of crack position to be made, and therefore the evaluation...

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  • Erwin Wojtczak mgr inż.

  • Antagonist adhesion effects due to variable substrate surface

    Publikacja
    • M. Budzik
    • J. Jumel
    • M. Shanahan

    - SOFT MATTER - 2012

    The effects of variability of intrinsic adhesion within a joint have been studied using a single cantilever beam (SCB) test. Fracture energy was found not to be a simple function of relative areas of 2 surface pre-treatments: a 'weak' zone decreased strength more than expected from simple, additive considerations. By severing the adhesive along the strong-weak transition, fracture energy increased.The prior antagonist effect appears...

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  • Formation and Growth of the Crack in Bonded Joints Under Mode I Fracture: Substrate Deflection at Crack Vicinity

    Publikacja

    - JOURNAL OF ADHESION - 2011

    Adhesive bonding is now commonly used in aircraft, cars, boats, etc. In these applications, thin panels are often bonded. In such thin structures, heterogeneous mechanical loading along the bondline edge (or potential crack front), is likely to arise due to 3D structural effects. The crack front and its vicinity is a special region, in that it is where structural properties of the adherend material meet those of the adhesive (discontinuity)....

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  • Fracture in Asymmetric Bonded Joints

    Publikacja

    - 2010

    Adhesion was studied in asymmetric bonded joints using fracture mechanics tests. The asymmetric bonded joints consist of two different type and/or thickness materials bonded by an adhesive. Mentions of asymmetric bonded joint tests employed so far are rare in the literature. They are imperfect and therefore are not standardized. Accordingly three new tests were introduced in this work to study bonded joints. The new metrological...

  • Tomasz Klimczuk prof. dr hab. inż.

    Stopnie naukowe i zawodowe dr hab. (2008)  Wydz. FTiMS PG dr (2001) Wydz. FTiMS PG inż. (1997) Wydz. ZiE PG mgr inż. (1995 )Wydz. FTiMS PG   Zatrudnienie grudzień 2013 – do chwili obcecnejprofesor nadzwyczajny na Wydziale Fizyki Technicznej i Matematyki Stosowanej Politechniki Gdańskiej wrzesień 2012 – grudzień 2013 adiunkt na Wydziale Fizyki Technicznej i Matematyki Stosowanej Politechniki Gdańskiej wrzesień 2009 – sierpień 2012grant-holder...

  • Adhesive compliance effect in mode I separation:Profilometry approach

    Publikacja

    The effect of adhesive compliance on the deflection of a loaded, bonded beam was studied using laser profilometry. Experimental data obtained were compared with both Euler-Bernoulli (encastré) and Winkler (one parameter elastic foundation) models. A third, analytical, 2D model, based on shear within the adhesive layer (two parameter elastic foundation), was introduced. Finite element analysis (FEA) was also used to study the effect...

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  • The effectiveness of polymer adhesive in reduction of vibrations of structural members

    Publikacja

    In this paper, the idea of using polymer adhesive as a damping layer is proposed. An experimental study of two aluminium cantilevered beams has been conducted. One of them presents a plain cantilevered beam, while the second one considers two aluminium beams bonded with a polymer adhesive of different thickness (0,5; 1,2; 1,75; 3,1 and 5 mm). The polymer adhesive considered in the study is a specially designed flexible...

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  • Guided wave propagation for assessment of adhesive bonding between steel and concrete

    Publikacja

    Adhesive bonding is becoming more increasingly important in joining of structural elements. In civil engineering, there is a growing interest in connection by adhesive bonding in steel-concrete flexural members. This study concerns the guided wave propagation technique applied to condition assessment of an adhesive connection between a steel member and a concrete beam. Various states of degradation were considered by producing...

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  • Enhancing the Seismic Resistance of Columns by GFRP Confinement Using Flexible Adhesive-Experimental

    Publikacja

    In this paper, the results of two experiments, focused on testing the effectiveness of a method of enhancing the seismic (dynamic) resistance of masonry columns with the use of flexible polymer adhesive, are shown. The first experiment was devoted to investigate the damping properties of a polymer working between two stiff layers, whereas the aim of the second one was to verify if the identified damping properties of the polymer...

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  • Application of guided waves in the evaluation of steel-concrete adhesive connection

    Publikacja

    - 2018

    The aim of the paper is the application of guided waves in the evaluation of a condition state of adhesive connection between steel and concrete. The study concerns a push-out specimen consisting of two steel plates glued to opposite faces of a concrete cube with the use of structural adhesive. Wave propagation in the specimen without external load is investigated both experimentally and numerically. The second stage of the investigation...

  • Jarosław Guziński dr hab. inż.

    STOPNIE NAUKOWE 2000   Stopień doktora nauk technicznych – Wydział Elektryczny Politechniki Gdańskiej. Rozprawa doktorska pt.: „Układ sterowania silnikiem asynchronicznym z regulatorem kąta obciążenia” obroniona 27 czerwca 2000 r – z wyróżnieniem. 2012  Stopień doktora habilitowanego nauk technicznych – Wydział Elektrotechniki i Automatyki PG. Rozprawa habilitacyjna „Układy napędowe z silnikami indukcyjnymi i filtrami wyjściowymi...

  • Rafał Leszczyna dr inż.

    Dr inż. Rafał Leszczyna jest adiunktem na Wydziale Zarządzania i Ekonomii Politechniki Gdańskiej. W grudniu 2006 r. uzyskał stopień doktora nauk technicznych w zakresie informatyki ze specjalizacją w dziedzinie bezpieczeństwa komputerów. W latach 2004–2008 pracował we Wspólnym Centrum Badań Komisji Europejskiej (European Commission Joint Research Centre), w zespołach zajmujących się bezpieczeństwem informacji i bezpieczeństwem...

  • Krzysztof Cwalina dr inż.

    Krzysztof Cwalina received Ph.D. degree in telecommunication engineering, from Gdansk University of Technology in 2017. He received the M.SC. Eng. degree in telecommunication engineering, from Gdansk University of Technology in 2014. Currently research assistant in the Department of Radiocommunication Systems and Networks. His research interests include WBAN (Wireless Body Area Networks), resource allocation in heterogeneous WBAN,...

  • Accurate and continuous adhesive fracture energy determination using an instrumented wedge test

    The wedge test and the related double cantilever beam test are practical methods of assessing structural adhesive fracture energy. In the former, and to a lesser extent the latter, a recognised problem is the difficulty of following the length of the growing crack, required to calculate fracture energy with any accuracy. We present a novel method of measurement of crack length that has the advantages of being accurate and allowing...

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  • Biocompatibility and bioactivity of bearing loaded metallic implants

    Presentation of developed titanium alloy base composite materials possessing better biocompatibility, longer lifetime and bioactivity behavior for bearing loaded implants, e.g. hip joint and knee joint endoproshtesis.

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  • DETECTION OF DEBONDING IN STEEL BARS EMBEDDED IN CONCRETE USING GUIDED WAVE PROPAGATION

    Publikacja

    The paper presents a non-destructive diagnostic technique based on guided wave propagation phenomenon used to assess the adhesive bonding between a steel bar and a concrete cover. Double-layered cylindrical specimens with different levels of debonding and its location were investigated. The influence of bonding length on the excitation of multiple modes of longitudinal guided waves was analysed. Numerical simulations of guided...

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  • Corrosion behavior of hydrogen charged super duplex stainless steel welded joints

    The electrochemical behavior of the weld metal, heat-affected zone (HAZ), and base material of super duplex stainless steel (SDSS) welded joints, made with the application of flux-cored arc welding (FCAW) and submerged arc welding (SAW), were investigated with the use of metallographic examinations (optical microscopy and scanning electron microscopy), potentiodynamic polarization measurements and total hydrogen content determination...

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  • Process zone in the Single Cantilever Beam under transverse loading. - Part I: Theoretical analysis

    Publikacja

    Single Cantilever Beam (SCB) specimen loaded with a transverse force parallel to the crack front is proposed for the analysis of crack propagation phenomena under mixed mode conditions. The stress redistribution in the adhesive layer in the vicinity of the crack front so as the beam deformation are estimated using a Timoshenko beam on elastic foundation model. This model emphasizes the Mode II contribution due to flexural beam...

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  • Adhesive Monitoring with Instrumented Wedge Test

    Publikacja

    - 2010

    The wedge test (sometimes called the Boeing wedge test) is amongst the most readily exploitable techniques for assessment of the rate-dependent fracture energy of adhesive materials when used to bond relatively rigid substrates. With its siblings: the double cantilever beam (DCB), and the tapered double cantilever beam (TDCB), a force is applied, essentially in cleavage, to provoke substrate separation perpendicularly to the bondline...

  • Analysis of wave propagation in a bolted steel joint

    Publikacja

    The paper presents results of numerical and experimental investigations of elastic wave propagation in a bolted single-lap joint. The research was carried out for both symmetric and antisymmetric Lamb wave modes. In experimental studies the PZT transducers were used to excite and register wave propagation signals. The controlled value of the torque during measurements was ensured by the use of high precision torque wrenches. Numerical...

  • Experimental and numerical analysis of an aluminum cantilevered beam with polymer adhesive

    In this paper, experimental and numerical investigation on a composite cantilevered aluminum beam has been conducted. The subject of the study consists of two plain aluminum elements bonded with polymer adhesive of different thickness. It has been proven in the previous study that this kind of material has high damping properties. During an experimental investigation, value of damping ratios have been obtained. The aim of a numerical...

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  • Diagnostics of bolted lap joint using guided wave propagation

    Publikacja

    The paper presents numerical and experimental analyses of elastic waves propagation in a bolted lap joint. In experimental investigations condition assessment of the joint was performed with the use of symmetric waves excited by a piezoactuator. Numerical calculations were conducted in commercial finite element method software Abaqus. The influence of number of bolts and the value of the initial stress on recorded signals was examined....

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  • Evaluation of adhesive forces and the specific surface energy of zirconia stabilized by yttria with alumina

    Publikacja

    - 2016

    The adhesive forces and the specific surface energy of ceramic material surfaces are very important for further tribological and biomedical applications of ceramics. Partially stabilized zirconia (zirconium oxide) is popular for manufacturing various medical products. ZrO2 stabilized by Y2O3 with additions of 5 wt% alumina was produced by slip casting method with a subsequent sintering. Structure and chemical composition of ceramic...

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  • THE INFLUENCE OF MANUFACTURING OVERSIZING ON POSTWELDING DISTORTIONS OF THE FILLET WELDED JOINT

    Welding proces is basic joining technique in shipbuilding. Such method generated welding distortions which cause a lot of problems during the manufacturing process. In the literature it is proposed wide spectrum of suggestions for a correct estimation of welding deformation in particular angular deformation in the fillet welded T joint. In the work influence of oversizing of weld on angular distortions of joint is presented basing...

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  • Load carrying capacity of the eccentric joint in the truss made of open cross-sections

    The influence of eccentricity at intersections of truss members on the load carrying capacity of the truss joint is presented in the paper. The research truss elements were designed as cold-formed open cross section. Analytical calculations, numerical analysis and experimental research were conducted to reveal how the eccentricity affects the effort of material in the joint area. The results of analysis and investigations are compared...

  • Investigation of polyurethane elastomer–steel joints using glass lacquer as an adhesive agent

    This article describes an innovative method of coupling polyurethane elastomer (based on polyurethane glycolysate) with constructional steel, by implementation of a Glaspur®—glass lacquer containing latent polyurethanes and monosilane adhesion promoters. The commonly applied coupling agent is Cilbond® 45SF glue or its derivatives. Additionally, glycolysate was synthesised from polyurethane waste and 1,3-propylene glycol in 6:1...

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  • 3D Computer Model of the Hip Joint Cartilage

    This paper presents 3D computer model of the hip joint cartilage in the ANSYS program. Model is made on the basis of anatomy and collected data on the material constants of bone and cartilage components. Analysis and comparison of biochemical model, viscoelastic and molecular mixed - aggregation serves to facilitate the creation of the next model of reality, which could be used in the design of joint prostheses. The correctness...

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  • influence of a change in the meniscus cross-sectional shape on the medio-lateral translation of the knee joint

    Publikacja

    - PLOS ONE - 2018

    Objective The purpose of this study was to evaluate the influence of a change in the meniscus cross sectional shape on its position and on the biomechanics of a knee joint. Methods One main finite element model of a left knee joint was created on the basis of MRI images. The model consisted of bones, articular cartilages, menisci and ligaments. Eight variants of this model with an increased or decreased meniscus height were then...

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  • Effect of adhesive compliance in the assessment of soft adhesives with the wedge test

    Publikacja

    Wedge tests are usually analysed assuming that the free, unbonded members may be treated as encastré cantilever beams. However, if the adhesive layer is sufficiently flexible (e.g., due to low elastic modulus), then significant strain in the bonded region may occur and lead to modification of the behaviour outside this region. Using in conjunction a sensitive strain gauge method on asymmetric wedge tests and a mathematical analysis...

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  • CTOD designation for WM and HAZ in butt joint made from S460 ML steel, Expertise No. WOiO/II/82/2015

    Typical (normative) testing of materials and/or welded joints do not answer on all questions about material or welded joint properties. In ship building and off-shore sectors, many strucures requires materials and joint with higher than typical fatigue resistance. Imact tests, which are carried out during welding technology qualification, gives answer about ductility, CTOD tests results about material or welded joint ability to...

  • Designate CTOD of Weld Metal of butt weld, No WOiO/II/108/2013

    Publikacja

    Typical (normative) testing of materials and/or welded joints do not answer on all questions about material or welded joint properties. In ship building and off-shore sectors, many strucures requires materials and joint with higher than typical fatigue resistance. Imact tests, which are carried out during welding technology qualification, gives answer about ductility, CTOD tests results about material or welded joint ability...

  • Designate of CTOD for WM and HAZ, report no: WOiO/II/122/2014

    Typical (normative) testing of materials and/or welded joints do not answer on all questions about material or welded joint properties. In ship building and off-shore sectors, many strucures requires materials and joint with higher than typical fatigue resistance. Imact tests, which are carried out during welding technology qualification, gives answer about ductility, CTOD tests results about material or welded joint ability to...

  • Designate CTOD Heat Affected Zone of butt weld, Report No: WOiO/II/76/2013

    Publikacja

    Typical (normative) testing of materials and/or welded joints do not answer on all questions about material or welded joint properties. In ship building and off-shore sectors, many strucures requires materials and joint with higher than typical fatigue resistance. Imact tests, which are carried out during welding technology qualification, gives answer about ductility, CTOD tests results about material or welded joint ability...

  • Fracture in composite/aluminium joints of variable adhesive properties

    Publikacja

    - JOURNAL OF ADHESION - 2009

    A strain gauge technique recently developed with the wedge test, for estimating crack length and, thus, the fracture energy of structural adhesive bonding, has been employed on a system in which one adherend had two types of surface treatment. Simple polishing and polishing with subsequent sandblasting were the treatments used, with a distinct straight line, perpendicular to the sample edges, separating the two. Despite the clear-cut...

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  • Modelling of planar movement dynamics of upper limb

    Publikacja

    The original model describing planar movement dynamics of upper limb is presented. The upper limb is modelled as two-joints system loaded by external forces and internal forces of striated skeletal muscles. A behaviour of each muscle is modelled as a system composed of serially linked rheologic fragments that have different mechanical properties. These muscle models allow us to simulate a behaviour of short fusiform muscle (3DOF...