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Tytuł:
Failure analysis of beam composite elements subjected to three-point bending using advanced numerical damage models
Autorzy:
Różyło, Patryk
Powiązania:
https://bibliotekanauki.pl/articles/2204651.pdf
Data publikacji:
2023
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
three-point bending
carbon-epoxy laminate
numerical simulation
experimental tests
finite element method
failure
Opis:
This paper deals with the experimental and numerical analysis of three-point bending phenomenon on beam composite profiles. Flat rectangular test specimens made of carbon–epoxy composite, characterised by symmetric [0/90/0/90]s laminate ply lay-up, were used in this study. Experimental testing was carried out with a COMETECH universal testing machine, using special three-point bending heads. In addition, macroscopic evaluation was performed experimentally using a KEYENCE Digital Microscope with a mobile head recording real-time images. Parallel to the experimental studies, numerical simulations were performed using the finite element method in ABAQUS software. The application of the above-mentioned interdisciplinary research techniques allowed for a thorough analysis of the phenomenon of failure of the composite material subjected to bending. The obtained research results provided a better understanding of the failure mechanism of the composite material.
Źródło:
Acta Mechanica et Automatica; 2023, 17, 1; 133-144
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology of Production of Mold Filling Material for Specific Purposes in the Field of Metallic Foam Casting
Autorzy:
Kroupová, Ivana
Bašistová, Martina
Lichý, Petr
Merta, Václav
Radkovský, Filip
Jezierski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/28099598.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
molding mixture
metallic foams
precursor
abrasion loss
3-point bending strength
Opis:
This paper describes the technology for the production of precursors (space holder material) used to form the complex internal structure of cast metal foam. The precursor material must exhibit sufficient refractoriness, resist contact with liquid metal and at the same time should exhibit good collapsibility after casting. With regard to the greening of foundry production, the focus of this paper was on materials that could exhibit the above properties and at the same time do not have a negative impact on the environment. In this paper, the technology for the production of spherical precursors from a self-hardening mixture with a geopolymer-based binder system is described and verified. The motivation for the choice of material and all the sub-steps of the process - molding into the core box, tumbling, including the necessary accompanying tests of the mechanical properties of the core mixture being verified - are described.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 757--763
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-point bending of a beam with non-homogeneous structure in the depth direction
Autorzy:
Magnucki, Krzysztof
Magnucka-Blandzi, Ewa
Witkowski, Dawid
Wittenbeck, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/38912690.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
non-homogeneous beam
shear deformation theory
three-point bending
Opis:
This paper is devoted to the behavior of a non-homogeneous simply supported beam under three-point bending. The individual shear deformation function of a planar cross-section is adopted, and longitudinal displacements, strains, and stresses for two parts of the beam are explained. By applying the principle of stationary potential energy, a system of two differential equations of equilibrium is derived and solved analytically. The positions of the neutral axis, shear coefficients, and deflections are then calculated for three different beam families. Additionally, the bending problem of these beams is studied numerically using the finite element method (FEM). The results of both analytical and numerical calculations are presented in tables and figures. The main contribution of this paper lies in the development of an analytical model incorporating the individual shear deformation function and a numerical FEM model for this beam.
Źródło:
Engineering Transactions; 2023, 71, 4; 645-665
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the Bending Resistance Properties of Carbon Fiber/Foam Sandwich Structural Composites with Different Laying Angles
Autorzy:
Zhu, Lvtao
Cao, Shengbin
Zhang, Xiaofeng
Shen, Wei
Zhu, Chengyan
Powiązania:
https://bibliotekanauki.pl/articles/2171959.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
sandwich structure
composite
carbon fibre
ply angle
three-point bending
Opis:
This research aimed to explore the influence of fiber laying angles on the bending resistance properties of carbon fiber/foam sandwich structural composites. Four kinds of composites with the following laying angles: [0°]8, [0°/45°/90°/-45°]s, [0°/90°]4 and [45°/-45°]4 were prepared and tested in three-point bending experiments. The results obtained showed that the bending resistance performance was the best when the laying angle was [0°]8, while it was the worst when the laying angle was [45°/-45°]4. Besides, it was found that the tensile performance was the best when the fibers were arranged in the 0° direction when the strength utilisation rate was the highest. In addition, by observing the failure morphologies of the composites, the delamination and foam cracking were found in the four groups of composites. In contrast, the phenomenon of significant fracture was found on composites with a laying angle of [45°/-45°]4 only, indicating it had a poor bending resistance performance.
Źródło:
Fibres & Textiles in Eastern Europe; 2022, 2 (151); 75--81
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fillet effect on the bending crashworthiness of thin-walled square tubes
Autorzy:
Xie, Zhongyou
Zhao, Zhixian
Zhou, Xiuneng
Li, Cheng
Powiązania:
https://bibliotekanauki.pl/articles/2086940.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thin-walled square tubes
bending crashworthiness
fillet effect
three-point bending
finite element analysis
Opis:
Filleting four corners of square tubes is suggested to reduce the peak force and improve energy absorbing performance. Three-point bending tests are conducted to investigate fillet radius effects employing an ABAQUS explicit code. Three cases characterized by the ratio of width to thickness are considered. Fillet greatly reduces the maximum forces compared with square cross-sections, and the normalized maximum forces decrease with increasing wall thickness when the fillet radius is larger. Additionally, the fillet dramatically improves SEA (Specific Energy Absorption). The normalized CFE (Crash Load Efficiency) significantly exceeds that of the square ones, and the normalized CLEs are almost identical with the increasing fillet radius.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 103--111
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on mechanical characteristics of rock type I fracture and anchorage strengthening mechanism
Autorzy:
Zhang, Wei
Zhao, Tongbin
Guo, Weiyao
Xing, Minglu
Powiązania:
https://bibliotekanauki.pl/articles/2104761.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
anchor rock
fracture type of I
fracture toughness
three-point bending test
toughening
Opis:
Engineering rocks are easily affected by excavation unloading and are in uniaxial compres- sion or tension, forming a typical I-type tension crack. Anchor rods are often used for on-site support to ensure safety and reliability of the project. The study of propagation and pen- etration of type I tension cracks and quantitative evaluation of rock anchoring effects are of great significance for exploring mechanical properties of rock fracture and revealing the mechanism of rock failure. In this paper, combined with speckle light measurement, a rock fracture toughness test of different anchoring positions and pre-tightening forces is carried out, the deformation evolution law of the crack tip and the fracture mechanics characteris- tics of the anchored rock are obtained, and the anchoring strengthening mechanism of the rock is discussed based on the theory of the net stress intensity factor. The research shows that the rock fracture process is divided into four stages: elastic deformation, steady crack propagation, crack instability propagation and residual deformation. After anchoring, the time of crack instability growth can be prolonged by 172% and the final residual deformation can be increased by 148%. Compared with the unanchored rock, the fracture toughness of rock initiation and instability increased by 83% and 124% respectively, and increased with growth of the pre-tightening force, which shows that the bolt increases the critical value of rock initiation and instability to achieve the toughening effect. After the rock is anchored, the time required for the crack to propagate to the same length increases by 55%, and the lateral deformation area is reduced by 46%, indicating that the lateral closing force of the bolt inhibits crack propagation and delays the instability of the rock matrix.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 423--434
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Load bearing capacity of laminated veneer lumber beams strengthened with CFRP strips
Nośność na zginanie belek z forniru klejonego warstwowo wzmocnionych taśmami CFRP
Autorzy:
Bakalarz, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1852384.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zginanie czteropunktowe
konstrukcja drewniana
włókno węglowe
zbrojenie
nośność
belka wzmocniona
taśma CFRP
timber structure
four-point bending
carbon fibre
reinforcement
load bearing capacity
reinforced beam
CFRP tape
Opis:
The paper presents the results of experimental tests on the reinforcement of bent laminated veneer lumber beams with carbon fibre reinforced polymer (CFRP) strips glued to the bottom of elements. CFRP strips (1.4×43×2800 mm) were glued to the beams by means of epoxy resin. The tests were performed on full-size components with nominal dimensions of 45×200×3400 mm. Static bending tests were performed in a static scheme of the so-called four-point bending. The increase in the load bearing capacity of the reinforced elements (maximum bending moment and loading force) was 38% when compared to reference beams. A similar increase was noted in relation to the deflection of the elements at maximum loading force. For the global stiffness coefficient in bending, the increase for reinforced beams was 21%. There was a change in the way elements were destroyed from brittle, sudden destruction for reference beams resulting from the exhaustion of tensile strength to more ductile destruction initiated in the compressive zone for reinforced beams. The presented method can be applied to existing structures.
W pracy przedstawiono wyniki badań eksperymentalnych dotyczących wzmacniania zginanych belek z forniru klejonego warstwowo za pomocą taśm węglowych (CFRP) przyklejanych do powierzchni dolnej elementów. Taśmy CFRP, o wymiarach 1,4×43×2800 mm, przyklejone zostały za pomocą żywicy epoksydowej. Badania przeprowadzono na elementach pełnowymiarowych o wymiarach nominalnych 45×200×3400 mm. Belki obciążano symetrycznie dwoma siłami skupionymi do zniszczenia. Na podstawie wyników badań stwierdzono: 1. Wzrost nośności – maksymalnej siły obciążającej oraz momentu zginającego w środku rozpiętości - belek wzmocnionych wyniósł 38%. Przyrost przeciętnej wartości modułu sprężystości wyniósł 11%. 2. Obciążanie belek za pomocą dwóch siłowników kontrolowanych za pomocą prędkości ich przesuwu umożliwia dokładniejsze przedstawienie rozkładu sił wewnętrznych w przekroju całego badania oraz kontynuacje zginania w przypadku wystąpienia częściowego zniszczenia w obrębie jednego z siłowników. Sposób prowadzenia obciążenia wpłynął na zróżnicowanie wartości sił w poszczególnych siłownikach w końcowej fazie badania. 3. Przedstawiony sposób wzmocnienia może zostać zastosowany w przypadku konstrukcji istniejących. Taśmy przyklejone zostały pomiędzy punktami podparcia elementów w części przęsłowej belki. 4. Belki referencyjne ulegały zniszczeniu na skutek wyczerpania nośności w strefie rozciąganej. W przypadku belek wzmocnionych inicjacja zniszczenia następowała w strefie ściskanej. Propagacja pęknięcia w dwóch przypadkach wywołała odspojenie taśmy CFRP oraz pękniecie w strefie rozciąganej. Taśmy CFRP pomimo odspojenia nie ulegały zniszczeniu.
Źródło:
Archives of Civil Engineering; 2021, 67, 3; 139-155
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of calculation method of pure mode II stress intensity factor of fine-grained concrete using different numerical models
Autorzy:
Zhou, Changlin
Peng, Bo
Deng, An
Gao, Xiaofeng
Li, Yaojia
Zhou, Lei
Zhu, Zheming
Powiązania:
https://bibliotekanauki.pl/articles/1839720.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fine-grained concrete
critical stress intensity factor
J-integral
anti-symmetrical four-point bending
FEM
XFEM
Opis:
Measuring and calculating methods of critical stress intensity factors (SIFs) have become hot topics which attracted large attention recently. In this work, anti-symmetrical four-point bending tests of cracked fine-grained concrete specimens were conducted experimentally and numerically by using a computer-controlled universal testing machine and ABAQUS code. A comparative study of the calculation method of pure mode II stress intensity factor of a fine-grained concrete was performed by utilizing the conventional finite element method (FEM) in two and three dimensions as well as the extended finite element method (XFEM) in three dimensions. The results show that in three-dimensional models, the crack mode is closest to the pure mode II at the center of specimen thickness. Pure mode II stress intensity factors obtained by SEAM2D and XFEM3D are 1.013 and 1.0617 times that by SEAM3D, respectively. Pure mode II stress intensity factors of the fine-grained concrete obtained by the conventional FEM are more stable than that by XFEM. The number of mesh circles has slight influence on the calculation results of pure mode II stress intensity factor.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 2; 251-264
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Properties of EN AC 51200 Aluminum Alloy
Autorzy:
Uhríčik, M.
Palček, P.
Chalupová, M.
Hanusová, P.
Kuchariková, L.
Powiązania:
https://bibliotekanauki.pl/articles/356674.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
Al-Mg cast alloy
three-point bending loading
fatigue
fracture surface
Opis:
The article will be focused on analysis of properties of aluminum alloy for the casting of type Al-Mg. As an experimental material was used aluminum alloy EN AC 51200, supplied in a cast state without a heat treatment. It was produced by the continuous casting method. Experiments deal with microstructural material analysis, fractographic analysis, mechanical and fatigue tests. The microstructure of the testing sample was examined using an optical microscope Neophot 32. Fatigue properties of aluminum alloy was tested by three-point bending cyclic loading. The fracture surface of the testing sample was examined using scanning electron microscopy (SEM), where sample was observed on various stages of the fatigue process, its characteristics and differences of fracture surfaces.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1437-1445
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gięcie na zimno dwuteownika HL1100
Cold bending of I-beam HL1100
Autorzy:
Marcinczak, Krzysztof
Marcinczak, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/129263.pdf
Data publikacji:
2020
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
zginanie trójpunktowe
zginanie na zimno
dwuteownik
HL1000
odkształcenie
podniesienie wykonawcze
pomiar światłowodowy
three-point bending
cold bending
I-section
deformation
cambering
fiber optic measurement
Opis:
W artykule opisano badanie w skali naturalnej trójpunktowego zginania na zimno dwuteownika HL1000. Przedstawiono przebieg badania oraz wybrane wyniki odkształceń uzyskane podczas nadawania podniesienia wykonawczego. Podczas badania wykorzystano innowacyjną metodę pomiarów światłowodowych.
The paper presents point cold bending of I-beam HL1100 – full-scale test. The implementation and selected results of deformations during cambering were presented. During The innovative method of measuring by fiber optics were used in research.
Źródło:
Builder; 2020, 24, 4; 114-116
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and experimental verification of impact response of laminated aluminum composite structure
Autorzy:
Wang, Jifeng
Morris, Tyler P.
Bihamta, Reza
Pan, Ye-Chen
Powiązania:
https://bibliotekanauki.pl/articles/140133.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laminated aluminum structure
axial drop
buckling
three-point bending
flexural response
delamination
Opis:
Laminated Aluminum Composite Structure (LACS) has shown great potential for replacing traditional bulk aluminum parts, due to its ability to maintain low manufacturing costs and create complex geometries. In this study, a LACS, that consists of 20 aluminum layers joined by a structural tape adhesive, was fabricated and tested to understand its impact performance. Three impact tests were conducted: axial drop, normal and transverse three-point bending drop tests. Numerical simulations were performed to predict the peak loads and failure modes during impacts. Material models with failure properties were used to simulate the cohesive failure, interfacial failure, and aluminum fracture. Various failure modes were observed experimentally (large plastic deformation, axial buckling, local wrinkling, aluminum fracture and delamination) and captured by simulations. Cross-section size of the axial drop model was varied to understand the LACS buckling direction and force response. For threepoint bending drop simulations, the mechanism causing the maximum plastic strain at various locations in the aluminum and adhesive layers was discussed. This study presents an insight to understand the axial and flexural responses under dynamic loading, and the failure modes in LACS. The developed simulation methodology can be used to predict the performance of LACS with more complex geometries.
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 2; 127-147
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric study on the spring-back effect in aa5052 alloy in the course of three-point roll bending process
Autorzy:
Shrinaath, Viswanathan
Vairavignesh, Ramalingam
Padmanaban, Ramasamy
Powiązania:
https://bibliotekanauki.pl/articles/1837930.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
three-point roll bending
multi-pass forming process
springback
dynamic explicit analysis
optimization
Opis:
Three-point roll bending is one of the most common forming processes employed to obtain the desired radius of curvature in the sheet metal operations. Upon the removal of the forming load, the sheet metal deforms to a lesser extent than that of the required dimension. This phenomenon is termed as spring-back and is considered the most challenging areas of research in three-point roll bending of sheet metals. This study aims to develop a numerical model using HyperWorks and Radioss solver to understand the influence of load, the distance between the forming rollers, and its thickness on the spring-back effect in the course of three-point roll bending of sheet metal (AA5052). The results of the numerical model are validated with the results of the experimental trials. Besides, a statistical model is developed to relate the amount of spring-back with the three-point roll bending process parameters.
Źródło:
Acta Mechanica et Automatica; 2020, 14, 3; 128-134
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie MMA
Test of mineral asphalt mixtures
Autorzy:
Mączka, Eryk
Mackiewicz, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/129329.pdf
Data publikacji:
2019
Wydawca:
PWB MEDIA Zdziebłowski
Tematy:
mieszanka mineralno-asfaltowa
metoda badania
moduł sztywności
zginanie czteropunktowe
deformacja trwała
mineral-asphalt mix
test method
stiffness modulus
four-point bending
permanent deformation
Opis:
The article presents an experimental method for testing beams made of AC16W mineral-asphalt mix in a static four-point bending test. Tests were performed at a fixed measuring temperature of 25°C and for different load levels. The conditions of the study that specify the variable characteristics of asphalt mixtures were specified. Attention was paid to the material specificity of the mixturesand the variability of the stiffness modulus was analyzed. Different ways of its determination with different load cycles are presented. The obtained results of the modules were compared with the results obtained in the dynamic test. The identification of the secant modulus from the dependence of the load curve between strain and stress for the first cycle was indicated.
Źródło:
Builder; 2019, 23, 1; 68-70
1896-0642
Pojawia się w:
Builder
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the recyclate on a deflection of composites in bending
Autorzy:
Panasiuk, Katarzyna
Kyzioł, Lesław
Hajdukiewicz, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/242849.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
recycling
three-point bending
composites
new materials
force-strain curves
Opis:
The aim of the research was to determine the effect of polyester-glass recyclate on the deflection of composite samples subjected to three-point bending. The polyester-glass recyclate was obtained from the part of the ship’s hull made of polyester-glass composite, constituting scrap metal. The pieces of scrap were pre-fragmented and then processed into a prepared stand for this purpose. Such a fragmented recycling will be used to make composites with different scrap / recycled content. For this purpose, research materials were made using the vacuum bag method with the percentage of 0%, 10% and 20% recyclate) as well as various granulation (i.e. 1.2 mm and 3.0 mm). The research material consisted of rectangular plates with a thickness corresponding to the thickness of the samples. The samples for testing were made by water cutting. The tests were carried out on a suitably prepared stand, which was made of a universal Zwick Roell testing machine and three-point bending handles and a dial indicator. The spacing of the supports has been determined in accordance with the binding standard for three-point bending. Obtained results from tests, i.e. strain, stress, deflection, deformation allowed analysing the impact of recyclate on bending strength and defining the deflection arrow. Based on the results obtained from three-point bending, it can be concluded that the polyester-glass recycling has an influence on the decrease of strength, stress and deflections of the tested composites.
Źródło:
Journal of KONES; 2019, 26, 4; 197-203
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the modulus fir wood reinforced with PBO fiber mesh
Autorzy:
Sokołowski, P.
Kossakowski, P. G.
Powiązania:
https://bibliotekanauki.pl/articles/231267.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
badanie laboratoryjne
konstrukcja drewniana
właściwości mechaniczne
zginanie czteropunktowe
laboratory tests
wooden structure
mechanical properties
four-point bending
Opis:
This paper presents the results of preliminary tests for estimating the modulus of elasticity of wooden beams from firs reinforced with PBO fiber mesh. The tests were carried out in the Materials Strength Laboratory at the Kielce University of Technology in Kielce, Poland with PN-EN 408:2004. The wooden elements were subjected to a four-point bending test with the aim of estimating the elastic modulus when bending, assuming the loading velocities of the loading forces of 5 mm / min. The obtained results show a significant increase in the load-bearing capacity of beams reinforced with PBO mesh.
Źródło:
Archives of Civil Engineering; 2018, 64, 4/I; 105-121
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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