Wyniki wyszukiwania - BazTech

1

Novel energy-absorbing auxetic sandwich panel with detached corrugated aluminium layers

Al-Rifaie Hasan

Vibrations in Physical Systems

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2023

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Vol. 34, nr 2

art. no. 2023215

EN

Sandwich panels have the potential to serve as plastically deforming sacrificial structures that can absorb blast or impact energies. Auxetic sandwich panels with welded or bolted corrugated layers have, as far as the author is aware, had their blast behaviour thoroughly addressed in the literature. Therefore, the objective of this numerical analysis was to create a novel, low-cost, simple-to-build graded sandwich panel with detached corrugated layers that may be employed as a multi-purpose sacrificial protective structure against a wide range of blast threats. The suggested sandwich panel has overall dimensions of 330x330x150mm and is made of six detached aluminium (AL6063-T4) layers enclosed in a steel (Weldox 460E) frame. With different stepwise plate thicknesses of 0.4, 0.8, and 1.2mm for each pair of layers, the six layers all have the same re-entrant auxetic geometry. Utilising the Abaqus/Explicit solver, the numerical analysis was carried out. A wide variety of blast intensities (4, 7, 11, 13, and 16 MPa peak reflected over-pressures) were tested on the suggested auxetic sandwich panel, and the results showed uniform progressive collapse, a superior decrease in reaction forces, and greater energy dissipation compared to comparable non-auxetic topologies. The innovative sandwich panel design has potential uses for both military and civic structures that need to be protected.

2

Numerical analysis of stress and temperature in the friction stir welding (FSW) process of steel

Szczecina Michał

Structure and Environment

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2023

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Vol. 15, no. 4

196--207

EN

Friction stir welding (FSW) is a modern technology for joining various metals, which has already undergone many laboratory tests, but still requires the development of numerical models. Author of the paper decided to summarize the current state of scientific knowledge regarding the modelling of the FSW process using the finite element method (FEM) and showed the main directions of development of numerical research on this process. Very advanced models are a combination of solid mechanics and fluid dynamics, but they often require expanding the computing environment with its own subroutines, as well as calibration and validation of some material parameter and constants occurring e.g. in the heat generation and heat flow laws. The Author of the paper proposed his own, simplified model, based on the computational solid mechanics and Lagrangian formulation. The model turned out to be an effective tool to reproduce stress and temperature fields during the FSW process.

PL

Zgrzewanie tarciowe z przemieszaniem (FSW) jest nowoczesną technologią łączenia różnych metali, posiadającą wiele zalet w porównaniu z tradycyjnym spawaniem. Zgrzewanie tarciowe zostało do tej pory poddane licznym badaniom laboratoryjnym, natomiast wymaga ciągłego rozwoju modeli numerycznych do symulacji tego procesu metodą elementów skończonych (MES). Autor artykułu postanowił dokonać podsumowania aktualnego stanu wiedzy dotyczącej modelowania zgrzewania tarciowego przy użyciu MES oraz wskazać główne kierunki rozwoju symulacji numerycznych tego procesu. Zaawansowane modele numeryczne zgrzewania tarciowego są kombinacją mechaniki ciała stałego z dynamiką płynów, a więc często wymagają rozbudowania środowiska obliczeniowego za pomocą własnych podprogramów, jak również kalibracji i walidacji wielu parametrów i stałych wymaganych do zdefiniowania np. prawa wytwarzania ciepła i prawa przepływu strumienia ciepła. Autor zaproponował swój własny uproszczony model bazujący na mechanice ciała stałego i opisie Lagrange’a. Model okazał się efektywnym narzędziem do odtworzenia naprężeń i pola temperatury w procesie zgrzewania tarciowego z przemieszaniem.

3

Еlastic properties of tyres affecting car comfort, driving and riding

Dechkova Silvia

International Journal of Applied Mechanics and Engineering

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2023

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Vol. 28, no. 4

54--68

EN

The present paper focuses on an elastic properties analysis of new and depreciated tires. The research was carried out using two different methods, field and numerical, respectively. The purpose of the study is to check whether there is a change in the elastic properties of the tire during its depreciation and to what extent these processes affect the comfort of driving and riding. The experimental tests were conducted on a hydraulic test stand and by applying strength and deformation analysis the effect of its structure deformation was additionally considered. The investigation performed on a vehicle-based tire test stand to find out stress-strain and tire deformation was with different vertical loading according to FEM. The numerical solution was reached by implementing SolidWorks - Simulation and Abaqus. The obtained results are graphically compared, and the average value of the elastic constant for a new and depreciated tire has been determined.

4

Influence of Anchor Depth and Friction Coefficient Between Anchor and Rock on the Trajectory of Rock Masses Detachment

Jonak Józef, Karpiński Robert, Wójcik Andrzej

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

290--298

EN

This work presents the results of a FEA (Finite Element Analysis) concerning the propagation of the fracture tra- jectory during the detachment of rock masses. The analysis considers mechanical anchoring parameters, including the depth of anchoring and the friction between the anchor head and the brittle material. The analysis involved varying the effective anchorage depth hef = 50, 100, and 150 mm, along with considering different coefficients of friction (μ) for the anchor head against the rock, including 0.15, 0.3, and 0.45. The results indicated that within the chosen range of anchorage depths, the extent of damage increases with the depth of anchor embedment. However, the depth of anchoring, considering the studied range of this parameter and the assumed mechanical properties of the rock, did not have a significant effect on the value of the angle cone (α0) during the initial phase of the medium’s destruction. For the friction coefficient μ = 0.15, there is a clear deep penetration into the fracture at its initial stage of development (at the initial angle of α0 = -20°), promoting further spread of the fracture on the free surface. For larger values of the friction coefficient (μ = 0.3 and 0.45) – the trend is less pronounced (α0 = -2°÷-8°) resulting in a decrease in the crack range.

5

Badania eksperymentalne i symulacje komputerowe ściany osłonowej MB-SR50N HI obciążonej wiatrem

Juraszek Janusz, Woźniczka Piotr, Rusin Dawid

Materiały Budowlane

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2022

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nr 9

53--55

PL

W artykule przedstawiono wyniki badań i symulacji numerycznych MES ściany osłonowej MB-SR50N HI wykonanej z profili aluminiowych. Przeprowadzono badania polegające na obciążeniu wiatrem ściany osłonowej, zarówno ciśnieniem, jak i podciśnieniem o wartości 2400 Pa w specjalnej komorze badawczej. Wyznaczono wartości ugięć w wybranych punktach pomiarowych. Zbudowano model numeryczny ściany osłonowej za pomocą systemu MES Abaqus. Uwzględniono nieliniowość geometryczną oraz rzeczywiste obciążenie o wartościach analogicznych, jak w przypadku badań eksperymentalnych. Otrzymane wyniki symulacji numerycznych są porównywalne z rezultatami badań doświadczalnych. Badanie przemieszczeń i ugięć aluminiowo-szklanych ścian osłonowych ma istotne znaczenie z punktu widzenia ich bezpieczeństwa eksploatacyjnego.

EN

This paper presents results of testing and numerical FEM simulations of the MB-SR50N HI curtain wall of aluminium profiles. Wind-load tests were carried out in a special testing chamber making it possible to load the curtain wall with pressure and partial vacuum of 2400 Pa. Values of deflection were determined in selected measuring points. A numerical model of the curtain wall was built using the Abaqus FEM system. Geometrical nonlinearity and the real load with values analogous to those obtained from experiments have been taken into account. The obtained results of numerical simulations are comparable with results of experimental research. The testing of displacements and deflections of aluminium-glass curtain wallsis important from the point of view of their operational safety.

6

Comparative assessment of commonly used concrete damage plasticity material parameters

Al-Rifaie Hasan, Mohammed Darbaz

Engineering Transactions

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2022

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Vol. 70, iss. 2

157-181

EN

The non-homogeneous and non-linear mechanical behaviour of concrete complicates the numerical simulations of its corresponding material model. The concrete damaged plasticity (CDP) model is one of the most popular constitutive models for concrete. State-of-the-art CDP material parameters are introduced in Abaqus documentation [1], Jankowiak and Łodygowski [2], and Hafezolghorani et al. [3]. Accordingly, this paper presents a novel comparative study of these commonly-used concrete CDP parameters by assessing the response of plain concrete specimens under quasi-static loading conditions. The research conducts standard laboratory tests: compressive strength test of a concrete cube and three-point flexural test of a plain concrete beam. Sophisticated non-linear computational models are built using Abaqus/CAE and analysed using Abaqus/Explicit solver. The results discuss and compare deformations, damage patterns, reaction forces, compressive strength, tensile stress and modulus of rapture. The thorough study concludes that choosing CDP parameters is case-dependant and should be selected carefully.

7

Analysis of the effect of projectile impact angle on the puncture of a steel plate using the finite element method in abaqus software

Rosłaniec Kuba

Applied Computer Science

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2022

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Vol. 18, no 1

56--69

EN

This paper deals with the punctureability of a steel plate by a projectile at different angles of attack. The effect of the projectile angle on the force required to penetrate a plate made of A36 steel is presented using Finite Element Method calculation software. Using Abaqus software, a dynamic model of a projectile striking a plate was modelled and the force required to penetrate a 5 mm thick steel plate was presented. The intro-duction gives an overview of the genesis of the topic and a brief historical background. The chapter on numerical analysis presents the numerical model used and how the simulation was modelled. In the conclusions, a summary of the results was formulated and conclusions were drawn regarding the observations and insights of the analysis. The force required to penetrate the plate was observed to increase with increasing projectile angle of attack and it was found that, as the angle of the plate increased, the force required to penetrate increased.

8

Minimizing of tunneling effect on existing infrastructure in Egypt

Asker Kamel I., Fouad Mohamed T., Bahr Mohamed A., El-Attar Ahmed N.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2021

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Vol. 30, No. 1

3--15

EN

A set of parametric studies by using the Abaqus software is conducting to investigate the effective method to seal the CWO sewer from the tunneling process. These methods include: (i) two deep grouted walls, (ii) adjacent slurry piles, (iii) bored reinforced concrete piles assisted with slurry piles, and (iv) grouted block confining the twin tunnel wall. Based on the results of parametric studies. Most of the protective studied technique was effective on reducing the tunneling effect on the ground movements.

9

Badania doświadczalne i numeryczne beleczek betonowych wzmacnianych włóknami przy zginaniu czteropunktowym

Erdem R. Tuğrul

Cement Wapno Beton

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2021

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R. 26, nr 5

431--443

PL

W niniejszej pracy zbadano zachowanie się beleczek betonowych z włóknami i bez nich. W części doświadczalnej wykonano łącznie 16 próbek beleczek o różnych wymiarach przekroju. 12 próbek zostało wzmocnionych włóknami syntetycznymi, które nadają betonowi twardość, udarność i wytrzymałość zmęczeniową. Stosunek masowy włókien w próbkach wynosi od 0% do 0.20%. Próbki poddawane są próbie czteropunktowego zginania w celu uzyskania maksymalnych wartości obciążenia i przemieszczenia, aż do osiągnięcia stanu zniszczenia. Następnie próbki belek są modelowane w programie do analizy elementów skończonych Abacus. Ze względu na porównanie wartości doświadczalnych i numerycznych oraz rozkładów naprężeń w próbkach widać, że analiza numeryczna może być rozwiązaniem przy badaniu zachowania się beleczek o różnych wymiarach w zginaniu czteropunktowym.

EN

In this study, the behavior of concrete beams with and without fiber was investigated. In the experimental part, a total of 16 beam specimens were manufactured having different section sizes. 12 specimens were reinforced with synthetic fibers, that provide toughness, impact, and fatigue strength to concrete. The fiber ratios of the samples varied between 0% and 0.20% by mass. The samples were subjected to a four-point bending test to obtain the maximum load and displacement values, until they reached the failure modes. Subsequently, the beam samples were modelled in the Abacus finite element analysis software. Due to the comparison of experimental and numerical values and stress distributions of the specimens, it is seen that numerical analysis could be an option when investigating the behavior of beams with different dimensions in four-point bending.

10

Hyperelastic models for the description and simulation of rubber subjected to large tensile loading

Jebur Q.H., Jweeg M.J., Al-Waily M., Ahmad H.Y., Resan K.K.

Archives of Materials Science and Engineering

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2021

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Vol. 108, nr 2

75--85

EN

Purpose: Rubber is widely used in tires, mechanical parts, and user goods where elasticity is necessary. Some essential features persist unsolved, primarily if they function in excessive mechanical properties. It is required to study elastomeric Rubber's performance, which is operational in high-level dynamic pressure and high tensile strength. These elastomeric aims to increase stress breaking and preserve highly pressurised tensile strength. Design/methodology/approach: The effects of carbon black polymer matrix on the tensile feature of different Rubber have been numerically investigated in this research. Rubber's material characteristics properties were measured using three different percentages (80%, 90%and 100%) of carbon black filler parts per Hundreds Rubber (pphr). Findings: This study found that the tensile strength and elongation are strengthened as the carbon black filler proportion increases by 30%. Practical implications: This research study experimental tests for Rubber within four hyperelastic models: Ogden's Model, Mooney-Rivlin Model, Neo Hooke Model, Arruda- Boyce Model obtain the parameters for the simulation of the material response using the finite element method (FEM) for comparison purposes. These four models have been extensively used in research within Rubber. The hyperelastic models have been utilised to predict the tensile test curves—the accurate description and prediction of elastomer rubber models. For four models, elastomeric material tensile data were used in the FEA package of Abaqus. The relative percentage error was calculated when predicting fitness in selecting the appropriate model—the accurate description and prediction of elastomer rubber models. For four models, elastomeric material tensile data were used in the FEA package of Abaqus. The relative percentage error was calculated when predicting fitness in selecting the appropriate model. Numerical Ogden model results have shown that the relative fitness error was the case with large strains are from 1% to 2.04%. Originality/value: In contrast, other models estimate parameters with fitting errors from 2.3% to 49.45%. The four hyperelastic models were tensile test simulations conducted to verify the efficacy of the tensile test. The results show that experimental data for the uniaxial test hyperelastic behaviour can be regenerated effectively as experiments. Ultimately, it was found that Ogden's Model demonstrates better alignment with the test data than other models.

11

Crack propagation analysis in selected railway bogie components

Mysłek Adam

Technical Transactions

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2020

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Vol. 117, iss. 1

art. no. e2020017

EN

This paper presents the practical application of fracture mechanics in investigating the possibility of crack propagation in a brake calliper bracket mounted in a vehicle bogie. The extended finite element method available in the Abaqus software was used. This method allows the modelling of material damage and its propagation independently of the finite element mesh. Damage can arise in any area of finite elements without changing the mesh. Numerical simulation of crack propagation was performed in order to analyse how crack changes as a result of the location change of damage initiation.

PL

W artykule przedstawiono praktyczne zastosowanie mechaniki pękania w badaniu możliwości propagacji pęknięć w wsporniku zacisku hamulca zamontowanym w wózku pojazdu. Zastosowano rozszerzoną metodę elementów skończonych dostępną w oprogramowaniu Abaqus. Ta metoda umożliwia modelowanie uszkodzeń materiału i jego rozprzestrzenianie się niezależnie od siatki elementów skończonych. Uszkodzenie może powstać w dowolnym obszarze elementów skończonych bez zmiany siatki. Przeprowadzono numeryczną symulację propagacji pęknięć w celu analizy zmian propagacji w wyniku zmiany lokalizacji inicjacji uszkodzeń.

12

Modeling of a three-point bend test of a beam made of AW 5083 alloy

Żuk Daria, Hajdukiewicz Grzegorz

Scientific Journal of Gdynia Maritime University

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2020

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nr 116

100--111

EN

The paper describes the modeling of a three-point bend test carried out on a beam made of the AW 5083 aluminium alloy performed using the finite element method. The three-point bend test was carried out experimentally in accordance with the current standard PN-EN ISO 7438:2016-0. During the test, the values of the beam material constants, such as Poisson number and Kirchoff modulus which were necessary for the modeling were determined. The results obtained in the test allowed for modelling using software based on the finite element method, such as MSC Patran and Abaqus software. The test modelling in the software was performed taking into account the beam geometry, the material properties, the boundary conditions, and the load. In order to verify the model, a comparative analysis was performed of the values of the bend of the beam’s central axis obtained from the experiment and the values obtained after the FEM modeling and those obtained by the analytical method.

13

Wybrane badania symulacyjne i doświadczalne toru bezstykowego

Kukulski Jacek, Makowski Jacek, Towpik Kazimierz

Prace Naukowe Politechniki Warszawskiej. Transport

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2019

|

z. 126

97--110

PL

W artykule przedstawiono zagadnienia dotyczące toru bezstykowego oraz omówiono problemy związane z jego eksploatacją. Istotną część artykułu stanowią wyniki badań symulacyjnych wykonanych dla opracowanego modelu toru bezstykowego obciążonego różnymi wartościami sił wzdłużnych, które mogą się pojawić podczas eksploatacji. Siły działają w szynie wskutek pojawienia się naprężeń termicznych o wartościach uzależnionych od zmiany temperatury szyny. Oprócz badań symulacyjnych przedstawiono również koncepcję badań doświadczalnych, które będą wykonywane na wybranym odcinku linii kolejowej. Do pomiaru sił wzdłużnych w różnych warunkach obciążenia i utrzymania toru bezstykowego wykorzystany będzie przyrząd MS-02. Wyniki pomiarów wykonanych w eksploatowanym torze posłużą w dalszej perspektywie do zweryfikowania i dalszego doskonalenia modeli numerycznych.

EN

The article presents issues related to the CWR (continuous welded track) and discusses the problems associated with its operation. An important part of the article is the results of simulation tests carried out for the developed model of a CWR track loaded with various values of longitudinal forces that may occur during operation. The forces act in the rail due to the occurrence of thermal stresses with values depending on the temperature change of the rail. In addition to simulation tests, the concept of experimental tests that will be performed on a selected section of the railway line is also presented. The MS-02 device will be used to measure longitudinal forces under various load conditions and to maintain the contactless path. The results of measurements made in the exploited track will be used in the long term to verify and further improve the numerical models.

14

Numerical validation of drilling of Al6061-T6 with experimental data

Elango Prashant, Marimuthu K. Prakash

Mechanics and Mechanical Engineering

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2019

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Vol. 23, nr 1

287--290

EN

Drilling is a cutting process that uses a drill bit to cut a circular profile in workpiece. Forces acting on the drill bit reduce its life expectance. Analysis of forces acting on the drill bit during drilling prevents the tool from failing prematurely because of wear and excess feed rate. Excess feed rate can induce excessive internal stress on both the tool and workpiece. This paper aims to study the effects of reaction force acting on a drill bit during drilling of Al6061-T6. A numerical finite element simulation study is performed with commercially available software called Abaqus. Simulation results depend on the right choice of material property such as Johnson-Cook material property and Johnson-Cook damage property. Validation of material property is achieved by comparison of experimental results with simulative results. Reaction force acting against the drill bit during drilling is compared.

15

Experimental verication of a numerical modelof RC beam with CFRP rope strengthening

Szczecina Michał, Tworzewski Paweł, Bacharz Kamil

Computer Assisted Methods in Engineering and Science

|

2019

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vol. 26, no. 3-4

137-151

EN

This paper presents results of experimental tests and numerical analysis of reinforced concrete (RC)beams containing an additional carbon fibre rope strengthening. Two single-span RC beam specimenswith classical reinforcing bars and stirrups and one carbon fibre rope as near-surface mounted (NSM)strengthening were tested in a four-point bending test. The paper presents and compares the resultsregistered by the ARAMIS system during the test of two beams with carbon fibre rope under monotonicload with the results obtained in finite element analysis with Abaqus software using the concrete damagedplasticity model for concrete.

16

Analiza numeryczna odkształceń blachy DC04 w procesie kształtowania wytłoczek osiowosymetrycznych

Kraska D., Trzepieciński T.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2018

|

z. 90 [298], nr 2

163--174

PL

Artykuł zawiera wyniki symulacji numerycznych metodą elementów skończonych procesu formowania wytłoczek cylindrycznych z wykorzystaniem metody jawnej (explicit) całkowania równań ruchu w warunkach kontaktu z tarciem izotropowym i anizotropowym. Przedstawiono wyniki eksperymentalne oraz numeryczne uzyskane w programie Abaqus 6.14-5. Celem badań eksperymentalnych była analiza płynięcia materiału pod wpływem zadawanych obciążeń. Wyniki te wykorzystano do weryfikacji wyników symulacji numerycznych. Stwierdzono, że chociaż anizotropia oporów tarcia decyduje o wysokości występów na krawędzi wytłoczki, wpływ warunków tarcia na ostateczny kształt wytłoczki i rozkład grubości ścianki jest stosunkowo niewielki w porównaniu z wpływem anizotropii materiałowej. Badania wykazały również, że analiza numeryczna uwzględniająca dyskretyzację blachy za pomocą 3-węzłowych trójkątnych elementów typu shell S3R zapewnia najlepsze przybliżenie wyników symulacyjnych do danych eksperymentalnych, gdy uwzględnia się w modelu numerycznym jednocześnie anizotropię materiałową oraz anizotropię oporów tarcia.

EN

This article presents the results of FEM (finite element method) numerical simulations of forming cylindrical drawpieces using the explicit integration procedure in the presence of contact conditions with isotropic and anisotropic friction. The experimental and numerical results obtained in the Abaqus 6.14-5 program are presented. The aimof the experimental research was to analyse material flow in the forming process. These results were used to verify the results of numerical simulations. It has been found that although frictional resistance anisotropy determines the height of the ears of a drawpiece, the influence of the frictional conditions on the final shape of the drawpiece and wall thickness distribution is relatively small compared to the effect of material anisotropy. The research has also shown that numerical analysis with the workpiece discretised by 3-node triangular shell elements S3R provides the best approximation of simulation results to experimental data in the conditions when numerical anisotropy and anisotropy of frictional resistance are included in the numerical model.

17

Numerical analysis of crack initiation and propagation in an aluminium sample

Różyło P.

Technical Transactions

|

2018

|

Vol. 115, iss. 1

187--194

EN

This paper reports an analysis of simulated crack propagation in an aluminium sample depending on the direction of external loads. The objective of the study was to perform a numerical analysis of crack propagation as well as to determine regions which are most susceptible to failure. The object of study was created from numerical analysis of material failure due to fibre separation using Abaqus 6.14. The modelling of crack propagation was performed using the numerical xFEM method for separating material fibres irrespective of the finite element mesh.

PL

W ramach pracy przeprowadzono symulację numeryczną procesu propagacji pękania aluminiowej próbki, w zależności od kierunku obciążeń zewnętrznych. Celem pracy było wykonanie badania numerycznego propagacji pękania materiału oraz wykazanie obszarów najbardziej newralgicznych. Przedmiot badań przygotowano w ramach analizy numerycznej zniszczenia materiału na skutek rozdzielenia włókien w oparciu o środowisko Abaqus 6.14. Propagacja procesu pękania materiału została przeprowadzona na podstawie metody badań numerycznych xFEM, stanowiącej metodę rozdzielania włókien materiału niezależnie przebiegającego od siatki elementów skończonych.

18

Numerical modeling of reinforced concrete beams, including the real position of reinforcing bars

Szczecina M., Tworzewski P., Uzarska I.

Structure and Environment

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2018

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Vol. 10, no. 1

28--38

EN

The article presents comparison of the results obtained from reinforced concrete beams experimental studies with the use of ARAMIS system (digital image correlation) with the results gained from numerical modeling. During studies, deviation from the plane of reinforced concrete beams was observed. Inventory of rebars positions in cross-section of this beams showed significant deviations. Analysis carried out in the work [1] revealed the impact of improperly embedded longitudinal reinforcement on the occurrence of horizontal displacements. Based on the collected data, numerical models of two selected reinforced concrete beams with correct and incorrect positon of the reinforcing bars were made using the Concrete Damaged Plasticity model in Abaqus software. It has been shown that premature interruption of the calculation appeared in models taking into account deviations in the position of reinforcing bars. However, the occurrence of horizontal displacements was still confirmed by numerical model for beams with incorrect positioning of rebars.

PL

W artykule przedstawiono porównanie wyników badań eksperymentalnych belek żelbetowych z wykorzystaniem systemu ARAMIS (korelacja obrazu cyfrowego) z wynikami uzyskanymi w wyniku modelowania numerycznego. W wykonanych badaniach zaobserwowane zostało odchylenie z płaszczyzny belek żelbetowych, spowodowane niezgodnym z projektem rozmieszczeniem prętów zbrojenia, co potwierdzono w pracy [1]. Inwentaryzacja położenia prętów zbrojeniowych w przekroju poprzecznym belek wykazała ich znaczne odchylenia. Na podstawie zebranych danych, w oprogramowaniu Abaqus, przy użyciu modelu Concrete Damaged Plasticity, wykonano numeryczne modele dwóch wybranych belek żelbetowych z prawidłowym oraz nieprawidłowym rozmieszczeniem prętów. Stwierdzono przedwczesne przerwanie obliczeń dla modeli uwzględniających odchylenie w położeniu prętów zbrojeniowych. Mimo to opracowany model numeryczny potwierdza występowanie przemieszczeń poziomych w belkach z niewłaściwym rozmieszczeniem prętów.

19

Damage Detection of Steel-Concrete Composite Beam

Szumigała M., Pełka-Sawenko A., Wróblewski T., Abramowicz M.

Civil and Environmental Engineering Reports

|

2018

|

Vol. 28, no. 3

30--49

EN

The paper presents analysis results of steel-concrete composite beams, identification and attempts to detect damage introduced in a discrete model. Analysis of damage detection was conducted using DDL (Damage, Detection, Localization), our own original algorithm. Changes of dynamic and static parameters of the model were analysed in damage detection. Discrete wavelet transform was used for damage localization in the model. Prior to ultimate analysis, two-tier identification of discrete model parameters based on experimental data was made. In identification procedure, computational software (Python, Abaqus, Matlab) was connected in automated optimization loops. Results positively verified the original DDL algorithm for damage detection in steel-concrete composite beams, which enables further analysis using experimental data.

PL

Niniejszy artykuł przedstawia wyniki analiz stalowo-betonowych belek zespolonych, identyfikację oraz próby detekcji uszkodzeń wprowadzonych w modelu dyskretnym. Analizy detekcji uszkodzeń przeprowadzono na podstawie opracowanego algorytmu UDL (Uszkodzenia D-detekcja, L-Lokalizacja). Podczas diagnostyki uszkodzeń analizowano zmiany w parametrach dynamicznych i statycznych modelu. Podczas lokalizacji uszkodzeń modelu wykorzystano dyskretną transformatę falkową. Analizy docelowe zostały poprzedzone dwupoziomowym procesem identyfikacji wybranych parametrów modelu dyskretnego w oparciu o wyniki badań doświadczalnych. Procedury identyfikacji przeprowadzono łącząc programy obliczeniowe (Python, Abaqus, Matlab) w automatyczne pętle optymalizacyjne. Wyniki przeprowadzonych analiz pozytywnie weryfikują opracowany algorytm UD-L do diagnostyki uszkodzeń stalowo-betonowych belek zespolonych, co pozwala na dalsze analizy w oparciu o badania doświadczalne.

20

Evaluation of the Damage Initiation of a Composite Thin-Walled Structure, on the Example of the ADUSTER Gyroplane Undercarriage

Szklarek Karol, Różyło Patryk

Advances in Science and Technology. Research Journal

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2018

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Vol. 12, no 4

48--55

EN

The subject of the research was a undercarriage leg of a gyroplane made of composite materials. The aim of the work was to assess the level of damage initiation of the composite gyroplane undercarriage. In the study, a structural capacity analysis was carried out, taking into account the phenomenon of damage initiation. Numerical calculations were conducted based on the finite element method in the ABAQUS® software. The issue was solved according to the Newton-Raphson algorithm.