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Department of Mechanics of Materials and Structures
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Catalog Publications
Year 2018
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Applications of Tensor Analysis in Continuum Mechanics
PublicationA tensor field is a tensor-valued function of position in space. The use of tensor fields allows us to present physical laws in a clear, compact form. A byproduct is a set of simple and clear rules for the representation of vector differential operators such as gradient, divergence, and Laplacian in curvilinear coordinate systems. The tensorial nature of a quantity permits us to formulate transformation rules for its components...
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Assessing vehicle restraint systems on horizontal curves
PublicationHorizontal curves, an element of road infrastructure, have a statistically high number of accidents. Considering that horizontal curves in the last ten years have had app. 10% of all road accidents representing app. 14% of all fatalities on Polish roads, the issue is serious and requires more research and proper road safety treatments. Data for 2007 - 2016 show that in the case of accidents on horizontal curves app. 45% of the...
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Badania nieniszczące i monitoring elementów konstrukcji budowlanych w warunkach laboratoryjnych
PublicationW artykule przedstawiono wyniki przykładowych badań diagnostycznych elementów konstrukcji inżynierskich w warunkach laboratoryjnych metodą propagacji fal mechanicznych. Testom poddano płytę stalową, zakładkowe połączenie klejone oraz czołowe połączenie śrubowe. Badania ukierunkowano na pozyskiwanie i rozpoznawanie wzorców uszkodzeń dla elementów i defektów o znanej geometrii oraz kontrolowanym sposobie zniszczenia. Przeprowadzone...
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BADANIA ODBIOROWE KOMPOZYTOWEJ KŁADKI NAD KANAŁEM RADUNI W PRUSZCZU GDAŃSKIM
PublicationW pracy przedstawiono wyniki badań przeprowadzonych podczas próby obciążeniowej kładki kompozytowej GFRP w Pruszczu Gdańskim. Badania obejmowały zarówno testy statyczne, jak i dynamiczne. Uzyskane wyniki wskazują na większą niż teoretycznie oczekiwaną sztywność przestrzenną konstrukcji. Wszystkie pomierzone parametry struktury były lepsze podczas pomiarów in-situ, niż wykazały analizy numeryczne.
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Badania odbiorowe obiektu gruntowo-powłokowego rekordowej rozpiętości
PublicationMosty o konstrukcji gruntowo-powłokowej są atrakcyjne, m.in. ze względu na specyficzne walory architektoniczne. Wiadukt tego typu został wzniesiony między innymi w ciągu drogi krajowej nr 16 Grudziądz - Olsztyn na obwodnicy Ostródy. Charakteryzuje się on unikalnym rozmiarem, niespotykanym dla tego typu konstrukcji. W artykule zaprezentowano wybrane wyniki powierzchniowego pomiaru przemieszczeń 3D z wykorzystaniem skanera laserowego.
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Bending of a Three-Layered Plate with Surface Stresses
PublicationWe discuss here the bending deformations of a three-layered plate taking into account surface and interfacial stresses. The first-order shear deformation plate theory and the Gurtin-Murdoch model of surface stresses will be considered and the formulae for stiffness parameters of the plate are derived. Their dependence on surface elastic moduli will be analyzed.
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Between Descriptive Geometry and CAD 3D
PublicationDescriptive geometry provides methods to analyse three-dimensional space through two-dimensional drawings and prepares to create technical documentation. Geometric form of an engineering project is presented by the means of projection methods based on a 3D model, which is present in designer’s imagination. The forthcoming era of Building Information Modelling (BIM) brings changes in the way the engineer works, as the vision is...
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Composite sandwich footbridge - measured dynamic response vs. FEA
PublicationThe paper describes a process of in situ dynamic tests of a composite sandwich footbridge before its accepta-tion for exploitation in real traffic conditions. It is only a part of a big research task that includes design, manufacture and introduce practical application of the bridge. The in situ measured natural modes and fre-quencies are compared with numerically determined ones. Finite element analysis is established to estimate...
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Damage Imaging in Lamb Wave-Based Inspection of Adhesive Joints
PublicationAdhesive 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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Deformation Analysis of a Composite Bridge during Proof Loading Using Point Cloud Processing
PublicationRemote sensing in structural diagnostics has recently been gaining attention. These techniques allow the creation of three-dimensional projections of the measured objects, and are relatively easy to use. One of the most popular branches of remote sensing is terrestrial laser scanning. Laser scanners are fast and efficient, gathering up to one million points per second. However, the weakness of terrestrial laser scanning is the...
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Direct shear stress vs strain relation for fiber reinforced composites
PublicationThe majority of fiber reinforced composites exhibit strong non-linear behavior in in-plane shear state. The effect is attributed to the micro-cracks appearing in the matrix and can be modeled on the micro and macro level. In this work the author proposes constitutive laws describing the non-linear in-plane shear response, which can be alternative for the relations commonly considered in the literature. The proposed equations are...
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Doświadczalne i numeryczne badania propagacji fal elektromagnetycznych w zastosowaniu do diagnostyki konstrukcji żelbetowych i ceglanych metodą georadarową
PublicationNiniejsza praca dotyczy zagadnień propagacji fal elektromagnetycznych z ukierunkowaniem na diagnostykę nieniszczącą obiektów budowlanych. Głównym celem rozprawy było opracowanie procedur umożliwiających efektywniejsze wykorzystywanie metody georadarowej w ocenie stanu konstrukcji żelbetowych i ceglanych. Szczególną uwagę poświecono sposobom identyfikacji prędkości propagacji fali elektromagnetycznej na podstawie anomalii obserwowanych...
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Ekspertyza techniczna konstrukcji mostu M-33 wykonywanego w km 12+150,73 drogi S6 w ramach realizacji przedsięwzięcia „Budowa obwodnicy Koszalina i Sianowa na S-6 wraz z odcinkiem S-11 od węzła „Koszalin” do węzła „Bielice”
PublicationCelem opracowania jest analiza projektu konstrukcji w jezdni prawej mostu M-33P [1] wykonywanego w km 12+150,73 drogi S-6 w ramach realizacji przedsięwzięcia „Budowa obwodnicy Koszalina i Sianowa na S-6 wraz z odcinkiem S-11 od węzła „Koszalin” do węzła „Bielice”. Podstawą do realizacji ekspertyzy były zauważone przez przedstawicieli Wykonawcy obiektu PORR S.A. nieprawidłowości w pracy konstrukcji mostu M-33P, które pojawiły się...
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Ekspertyza techniczna określająca przyczyny wystąpienia zarysowań w strefach dylatacji na ekranach zapory czołowej i bocznej zbiornika wodnego Nysa na rzece Nysa Kłodzka
PublicationCelem ekspertyzy technicznej jest określenie przyczyn wystąpienia zarysowań i pęknięć przy dylatacjach płyt żelbetowych, tworzących ekran zapory czołowej i bocznej zbiornika wodnego Nysa oraz prezentacja koncepcji naprawy.
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Elastoplastic nonlinear FEM analysis of FGM shells of Cosserat type
PublicationThe paper is a continuation of [1] where the formulation of the elastic constitutive law for functionally graded materials (FGM) on the grounds of nonlinear 6-parameter shell theory with the 6th parameter (the drilling degree of freedom) was presented. Here the formulation is extended to the elasto-plastic range. The material law is based on Cosserat plasticity and employs the well-known Tamura-Tomota-Ozawa (TTO) [2] mixture...
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Electroelastic biaxial compression of nanoplates considering piezoelectric effects
PublicationIn the present theoretical work, it is assumed that a piezoelectric nanoplate is connected to the voltage meter which voltages have resulted from deformation of the plate due to in-plane compressive forces whether they are critical buckling loads or arbitrary forces. In order to derive governing equations, a simplified four-variable shear deformation plate theory has been employed using Hamilton’s principle and Von-Kármán...
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Enhanced energy conversion as a result of fluid-solid interaction in micro- and nanoscale
PublicationIt is known that nano- and micromechanics require new approaches to right describing of surface-like phenomena which lead to an enhanced energy conversion. In this work, a general form of surface forces that consist of a contribution from both the friction and mobility components has been extended to collect the effects of bulk and surface motion of a fluid. Quite similar impact can be observed for a solid-fluid mixture, where...
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Estimation of Failure Initiation in Laminated Composites by means of Nonlinear Six-Field Shell Theory and FEM
PublicationThe monography deals with the problem of failure initiation in thin laminated composites. Known techniques of laminate structures modelling are briefly characterised. Eventually, shell based approach is chosen for the purpose of the description of the composite structures behaviour, as it predicts their deformation and states of stress effectively in a global sense. The nonlinear six parameter shell theory (6p theory) with asymmetric...
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Failure Monitoring and Condition Assessment of Steel-Concrete Adhesive Connection Using Ultrasonic Waves
PublicationAdhesive bonding is increasingly being incorporated into civil engineering applications. Recently, the use of structural adhesives in steel-concrete composite systems is of particular interest. The aim of the study is an experimental investigation of the damage assessment of the connection between steel and concrete during mechanical degradation. Nine specimens consisted of a concrete cube and two adhesively bonded steel plates...
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FEM simulation of laminate failure in the three point bending
PublicationThe paper presents a FEM simulation of failure of laminate subjected to the three point bending. The numeri-cal model is based on the equivalent single layer approach with 6-paramater non-linear shell theory kinematics. It is implemented in the non-commercial FEM code. The failure initiation is detected with the use of Tsai-Wu criterion. After the failure onset the progressive failure process is modelled through the appropriate...
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Finite element method simulations of various cases of crash tests with N2/W4/A steel road barrier
PublicationThe subject of this study is performance of N2/W4/A steel road safety barrier investigated in numerical simulations. System was checked under several types of initial conditions, which were assumed basing on the TB11 and TB32 normative crash tests. The main goal of present study is to investigate the relationship between initial conditions (angle and velocity) of the impact and the severity indices (associated to the vehicle occupant) during...
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Guided ultrasonic waves for detection of debonding in bars partially embedded in grout
PublicationThis paper deals with theoretical, numerical and experimental investigations of guided wave propagation in multilayered cylindrical bars with pre-existing debonding. The research focuses on a complex description of the nature of the wave phenomena occurring in a debonded specimen with a special emphasis on the influence of the location of damage on the wave conversion and diffraction. Experimental non-destructive and destructive...
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Guided waves for nondestructive diagnostics of embedded waveguides
PublicationThe thesis concentrates on comprehensive theoretical, numerical and experimental analysis of guided wave propagation in bars embedded in concrete or mortar. The investigations are focused on a particular type of objects representing a laboratory model of a ground anchor. Complex description of wave propagation phenomena in partially embedded bars is given and its application in...
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Harmonic Vibrations of Nanosized Magnetoelectric Bodies with Coupled Surface and Interphase Effects: Mathematical Models and Finite Element Approaches
PublicationThe harmonic problems for piezomagnetoelectric nanosized bodies with taking into account the coupled damping and surface effects are considered on the base of the generalized Gurtin-Murdoch model. In the development of previous investigations, the coupled mechanical, electric and magnetic surface effects with surface inertial terms are introduced into the model. For a homogeneous model, the composite material is considered as homogeneous...
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HYDROGEN PRODUCTION PERFORMANCE IN THERMOCATALYTIC REACTOR BASED ON THE INTERMETALLIC PHASE OF NI3AL
PublicationThe main aim of the following paper is mathematical modelling for momentum, heat and mass transfer, which is accompanied by chemical surface reactions of the flow of the mixture helium and methanol. The thermocatalytic devices used for decomposition of hydrocarbons incorporate vertical microchannels coupling at the ends and heated to 500 oC at the walls. The results of the experiment were compared with CFD calculations to calibrate...
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Identyfikacja prędkości fali elektromagnetycznej w przegrodach budowlanych diagnozowanych metodą georadarową
PublicationPraca jest poświęcona metodzie identyfikacji prędkości fali elek-tromagnetycznej na podstawie analiz dyfrakcji spowodowanych obecnością inkluzji w przegrodach budowlanych żelbetowych, ceglanych oraz zespolonych żelbetowo-ceglanych. Wyprowadzono trzy modele matematyczne opisujące dyfrakcje charakterystyczne dla inkluzji kołowej, pionowej inkluzji przy powierzchni skanowa-nia oraz granicy między dwoma ośrodkami, w którym jednym z...
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Implementacja metody dojrzałości do oceny wytrzymałości betonu przęsła mostu extradosed
PublicationArtykuł przedstawia wybrane informacje dotyczące metody dojrzałości z odniesieniem się do niektórych dokumentów normatywnych polskich i zagranicznych. Przedstawione są także informacje o urządzeniach stosowanych in situ do oceny wczesnej wytrzymałości betonu. Praca poświęcona jest implementacji monitoringu dojrzewania betonu wysokowartościowego (C 60/75) wbudowanego w przęsło mostu extradosed z zastosowaniem metody dojrzałości....
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Influence of an applied bearing system on behaviour of multi-span footbridge
PublicationThe cycle overpass in Gdynia is a box structure over 300 metres long, 10-span. It was opened for bicycle traffic in the second half of 2013. At the end of its construction, there was failure due to excessive horizontal displacement of the system. A number of bearings exceeded the range of permissible transverse shifts thus it was necessary to temporarily protect the spans from slipping. The FEM analysis of the original solution...
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Influence of selected additives and admixtures on underwater concrete and the environment
PublicationThe intensive civilization development has an influence on searching for new possibilities connected with extension of city agglomerations, both the areas of flat building and the industrial areas. One of the most interesting solution is to use water reservoirs, rivers and sea areas. The extension of buildings has an influence on building materials, especially hydrotechnical, which means development of production of hydrotechnical...
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KOMPOZYTOWY MOST DLA PIESZYCH OD KONCEPCJI DO WDROŻENIA
PublicationW pracy przedstawiono historię powstania pierwszej zaprojektowanej i wykonanej przez polski zespół jednoelementowej kładki wytworzonej w całości z kompozytów polimerowych FRP. Konsorcjum realizujące projekt tworzyli: Politechnika Gdańska (lider), Wojskowa Akademia Techniczna i firma Roma Sp. z o.o. Przedsięwzięcie, któremu nadano akronim FOBRIDGE, zostało zrealizowane dzięki dofinansowaniu Narodowego Centrum Badań i Rozwoju o numerze:...
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Lamb wave propagation in a single lap adhesive joint
PublicationThe 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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Lamb wave-based monitoring of shear failure of an adhesive lap joint
PublicationThe 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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Linear Pantographic Sheets: Existence and Uniqueness of Weak Solutions
Publicationwe address the well-posedness of the planar linearized equilibrium problem for homogenized pantographic lattices. To do so: (i) we introduce a class of subsets of anisotropic Sobolev’s space as the most suitable energy space E relative to assigned boundary conditions; (ii) we prove that the considered strain energy density is coercive and positive definite in E ; (iii) we prove that the set of placements for which the strain...
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Load test of new European record holder in span length among extradosed type bridges
PublicationThe article presents acceptance load tests of a newly built extradosed MS-3 bridge located along the national road DK-16 near Ostróda (Poland). The structure features significant dimension in European reference scale. It is a new record holder in span length regarding this distinct bridge category. Its length ranges 206 m. Static and dynamic load tests were performed here. The program was extended by entire structural laser scanning...
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Load testing of a suspended footbridge in Radom (Poland)
PublicationThe footbridge in Radom is a suspended bridge of an interesting architectural form. The structure was de-signed for 4 kN/m2 of crowd loading. Dynamic calculations were not included in the design. The structure’s acceptance tests took place on the 14th of October 2016. The behaviour of the footbridge in static testing met the expectations. Unfortunately, as a result of dynamic tests, dangerous behaviour of the footbridge was revealed....
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Macierzowa analiza konstrukcji prętowych w środowisku MATLAB®
PublicationNiniejsza książka poświęcona jest metodzie przemieszeń w ujęciu macierzowym, znanej także pod nazwą bezpośredniej lub komputerowej metody przemieszczeń. Podejście to jest szczególnym przypadkiem metody elementów skończonych (MES), która jest od wielu lat powszechnie stosowana w działalności inżynierskiej, w tym do analizowania różnorodnych problemów mechaniki. Metoda przemieszczeń jest dedykowana rozwiązywaniu układów prętowych....
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Metoda samoorganizacji i podążania za liderem roju nieholonomicznych robotów mobilnych z wykorzystaniem wirtualnych elementów sprężysto-tłumiących
PublicationCelem pracy jest demonstracja metody samoorganizacji i podążania za liderem nieholonomicznego roju robotów mobilnych, opartej na wirtualnych, tłumionych, liniowych sprężynach łączących sąsiadujące roboty. Analizę metody sterowania poprzedza wyprowadzenie dynamiki dwukołowego robota oraz określenie zależności między wirtualnymi siłami a wejściami sterującymi robota w celu osiągnięcia stabilnej formacji roju. Analizowane są dwa przypadki...
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Mixed 4-node shell element with assumed strain and stress in 6-parameter theory
PublicationWe propose a mixed hybrid 4-node shell elements based on Hu-Washizu principle. Apart from displacements both strains and stress fields are treated as independent fields. The element is derived in the framework of a general nonlinear 6-field shell theory with drilling rotation which is dedicated to the analysis of multifold irregular shells with intersections. The novelty of the presented results stems from the fact that the measures...
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Modal properties identification of a novel sandwich footbridge – Comparison of measured dynamic response and FEA
PublicationA modern sandwich composite footbridge made of high-tech materials, being an example of practical application of laminated composites in civil engineering, is presented. The in situ non-destructive testing of the footbridge, aiming to identify modal properties and pedestrian comfort, is described. The measured eigenmodes and eigenfrequencies are compared with numerically estimated values. Finite element analyses of the footbridge...
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Modelling of elastic wave propagation in a bolted joint using a thin layer of shell elements
PublicationThere are many mathematical models describing the propagation of elastic waves through the imperfect boundary of two media. They were successfully applied to modelling of high frequency bulk waves and their interaction with local defects. On the other hand, the existing literature models of bolted connections ignore the aspect of imperfect connection between elements. Therefore, this paper presents the concept of application of...
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Monitoring Steel Bolted Joints during a Monotonic Tensile Test Using Linear and Nonlinear Lamb Wave Methods: A Feasibility Study
PublicationThe structural integrity of steel bolted joints may be compromised due to excessive loading. Therefore, condition assessment and the detection of potential defects before they cause a failure have become a major issue. The paper is focused on the condition monitoring of a bolted lap joint subjected to progressive degradation in a tensile test. The inspection used Lamb waves propagated through the overlap area. Wave propagation...
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Nadzór naukowy związany z realizacja zadania inwestycyjnego pn. ,, Budowa linii tramwajowej wraz z infrastrukturą towarzyszącą w ulicy Nowej Bulońskiej Północnej w Gdańsku w ramach Gdańskiego Projektu Komunikacji Miejskiej - etap IVA". Audyt otwarcia
PublicationCelem opracowania jest weryfikacja projektu wykonawczego obiektów mostowych zaprojektowanych w ramach zadania inwestycyjnego pn. ,,Budowa linii tramwajowej wraz z infrastrukturą towarzyszącą w ulicy Nowej Bulońskiej Północnej w Gdańsku w ramach Gdańskiego Projektu Komunikacji Miejskiej - etap IVA" (audyt otwarcia). Zakres opracowania obejmuje: • ogólny przegląd dokumentacji, • analizę statyczno–wytrzymałościową mostu, • analizę...
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Nadzór naukowy związany z realizacja zadania inwestycyjnego pn. ,,Wiadukt Biskupia Górka w Gdańsku". Audyt projektu zamiennego
PublicationCelem opracowania jest weryfikacja dokumentacji projektowej zadania inwestycyjnego pn. ,,Wiadukt Biskupia Górka w Gdańsku". Zakres opracowania obejmuje: • ogólny przegląd dokumentacji poszczególnych obiektów inżynierskich; • analizę statyczno–wytrzymałościową estakady dojazdowej w jezdni prawej; • analizę statyczno – wytrzymałościową oraz globalnej stateczności wiaduktu łukowego nad torami kolejowymi; • analizę geotechniczną przyjętych...
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Naprężenia i odkształcenia podkładów podłogowych na bazie siarczanu wapnia warunkujące występowanie przerw dylatacyjnych
PublicationArtykuł stanowi kompendium wiedzy z zakresu stosowania anhydrytowych podkładów podłogowych, wytycznych co do wyznaczania przerw dylatacyjnych oraz przyczyn powstawania ewentualnych spękań.
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Non-Destructive Assessment of Masonry Pillars using Ultrasonic Tomography
PublicationIn this paper, a condition assessment of masonry pillars is presented. Non-destructive tests were performed on an intact pillar as well as three pillars with internal inclusions in the form of a hole, a steel bar grouted by gypsum mortar, and a steel bar grouted by cement mortar. The inspection utilized ultrasonic stress waves and the reconstruction of the velocity distribution was performed by means of computed tomography. The...
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Nonlinear FEM analysis of irregular shells composed of fiber metal laminates
PublicationThe paper deals with the analysis of failure initiation in shells made of Fiber Metal Laminates (FML). The elas-tic material law for orthotropic lamina is stated accounting for asymmetric in-plane stress and strain measures. The asymmetry results from the employed general nonlinear 6-field shell theory where the generalized dis-placements involve the translation and the proper rotation field. The novelty of the presented results...
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NUMERICAL ANALYSIS OF SPECIES DIFFUSION AND METHANOL DECOMPOSITION IN THERMOCATALYTIC REACTOR BASED ON THE INTERMETALLIC PHASE OF Ni3Al FOR LOW REYNOLDS NUMBERS
PublicationNumerical modelling of hydrogen production by means of methanol decomposition in a thermocatalytic reactor using corrugated foil made of the Ni3Al intermetallic phase is shown in the paper. Experimental results of the flow analysis of mixtures containing helium and methanol in a thermocatalytic reactor with microchannels were used for the initial calibration of the CFD calculations (calculations based on the Computational Fluid...
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Numerical simulation of hardening of concrete plate
PublicationThe paper presents a theoretical formulation of concrete curing in order to predict temperature evolution and strength development. The model of heat flow is based on a well-known Fourier equation. The numerical solution is implemented by means of the Finite Difference Method. In order to verify the model, the in situ temperature measurements at the top plate of a road bridge were carried out. A high agreement between numerical...
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Numerical simulation of the influence of the selected factors on the performance of a concrete road barrier H2/W5/B
PublicationThis paper discuss the influence of selected factors on the performance of a concrete road barrier H2/W5/B. Modelling techniques of a concrete road safety system were briefly discussed. Comparison to the full scale crash test results has been shown. The concrete road safety barrier has been investigated for evaluation of the overall damage after collision under various initial conditions. The failure assessment criterion has been...
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Numerical studies on the influence of selected construction features and road conditions on the performance of road cable barriers
PublicationCable barriers are commonly used on Polish roads, including motorways and local roads. Their main elements are pre-stressed wire ropes, which are usually anchored at two ends in concrete blocks buried in the soil. In this work numerical studies concerning the influence of selected construction features and parameters of the vehicle motion on the performance of cable barriers were performed. Numerical simulations are a useful tool...