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  1. 6 Archives of Civil Engineering
  2. 3 Archives of Civil and Mechanical Engineering
  3. 3 Biuletyn Wojskowej Akademii Technicznej
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  5. 2 Archives of Foundry Engineering
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  1. 4 Kaczmarek W.
  2. 3 Gromysz K.
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  4. 2 Bernatt Jakub
  5. 2 Gawron Stanisław
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  1. 5 2023
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1
Content available remote Effect of strain rate on static elastic response of glass-polyester composite. Part 2, Analysis of experimental results
Kozioł Mateusz, Latusek Szymon
Composites Theory and Practice
|
2023
|
R. 23, nr 1
44--49
EN
This paper is the second part of a study aimed at evaluating the influence of the strain rate of a plain weave GFRP laminate in a non-destructive static three-point bending test on the stress response of the material. It was found that the stress level during the entire course of the deflection rises with the increase in the strain rate. The relative change in the stress level is comparable for the 0/90 and 45/-45 samples. As the loading speed increases, the elastic modulus of the material also grows. For an increment in the strain rate from 1.11·10–3 to 5.57·10–1 1/s, the increase is 10% for the 0/90 samples and 17.7% for the 45/-45 samples. The dependence of the modulus on the strain rate is logarithmic. Based on the theoretical analysis, the cause of the observed effects of the strain rate on the material response was attributed to the viscoelastic behawior of the matrix (cured polymer resin) and the viscoelastic behavior of the system of fibers at the level of the laminate mesostructure.
2
Content available Polyurethane shape memory polymer: structure characterization and estimation of energy storage and dissipation during the tension process
Staszczak Maria, Gradys Arkadiusz, Golasiński Karol, Pieczyska Elżbieta A.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2023
|
Vol. 71, nr 6
art. no. e147343
EN
Shape memory polymers (SMP) are new multifunctional materials raising increasing interest in various functional applications. Among them, polyurethane shape memory polymers (PU-SMP) are particularly attractive due to their combination of shape memory, high strength and biocompatible properties. Developing new applications for PU-SMP requires comprehensive research on their characteristics. This work involved investigating the structure and mechanical behavior as well as characterizing the energy storage and dissipation of a thermoplastic PU-SMP with a glass transition temperature (Tg) of 25_C during tensile loading-unloading. The process of energy storage and dissipation in the PU-SMP was investigated based on the stress-strain curves recorded by a quasi-static testing machine and the temperature changes, accompanying the deformation process, obtained by using a fast and sensitive infrared camera. The results showed that the thermomechanical behavior of the examined PU-SMP depends significantly on the strain rate. At a higher strain rate, there are higher stress and related temperature changes, which lead to greater energy dissipation. However, the energy storage values estimated during the deformation process turned out to be not significant, indicating that the work supplied to the PU-SMP structure during loading is mainly converted into heat. It should also be noted that the structural investigation revealed no crystalline phase in the investigated PU-SMP.
3
Content available Experimental study on the dynamic tensile mechanical properties of marble under water and oil conditions
Li Chaoxin, Liu Dongyan, Zhu Yunhui
Archives of Civil Engineering
|
2023
|
Vol. 69, nr 3
317--330
EN
To investigate the dynamic tensile properties and energy dissipation characteristics of marble in three different conditions: dry, water-saturated, and oil-saturated, a Brazilian disk splitting test was conducted using a 50 mm diameter Hopkinson pressure bar (SHPB) device. The findings indicate that the peak strain and dynamic tensile strength of the three conditions increase with strain rate, exhibiting a clear strain rate effect. Additionally, lubricating effects of water and oil weaken internal shear sliding friction, thus promoting crack expansion. Furthermore, immersion of fluid in marble weakens the cementation of internal mineral particles, leading to lower tensile strength of marble saturated with water and oil compared to dry marble under dynamic impact. When analyzing the energy dissipation of marble, both the absorption energy and dissipation energy density increase with oil strain rate, indicating a positive correlation. Moreover, numerical results obtained from ANSYS/LS-DYNA correspond well with experimental data, thus verifying and interpreting the experimental outcomes.
4
Content available Analysis of the seismic performances of structures reinforced by self-centering buckling-restrained braces
Jin Yongxu, Xu Man, Jia Jie
Archives of Civil Engineering
|
2023
|
Vol. 69, nr 3
645--663
EN
The self-centering buckling-restrained brace (SC-BRB) may achieve self-restoration for structures and, to a certain degree, diminish the substantial seismic residual deformation following rare earthquakes when compared to the usage of the conventional buckling-restrained brace (BRB). It may be possible to reduce the abrupt change in stiffness at the location of the strengthened stories and make the outrigger better at dissipating energy by improving the design of the energy-dissipation outrigger. This study compares the seismic performances of two types of energy-dissipation outriggers with BRB and SC-BRB web member designs during rare earthquakes so that the changes can be measured. The results show that using the SC-BRB web member design reduces the maximum inter-story drift ratio by an average of 7.68% and increases the average plastic-energy dissipation of the outrigger truss by 8.75%. The evaluation results showthat the SC-BRB outrigger truss structure has better structural regularity and energy-dissipation performance. It has the ability to efficiently regulate the structural seismic response and lessen primary-structure damage.
5
Content available remote Quasi-static cyclic loading experiment and analysis of double-side slotted steel tube shear damper
Hui Cun, Zhou Zhongyi, Li Yonggang, Jiao Yongkang, Hai Ran
Archives of Civil and Mechanical Engineering
|
2023
|
Vol. 23, no. 1
art. no. e45, 2023
EN
The traditional shear type damper is optimized, and a low-cost double-sided slotted steel tube shear damper with steel tube is proposed. The elastic-plastic deformation in the plane of the slotted steel plate on the side of the steel tube is used to absorb the seismic energy to achieve the purpose of vibration reduction. Taking the height, width, joint width and wall thickness of the bending element as the design parameters, four groups of nine double-sided slotted steel tube shear dampers are designed and quasi-static tests are carried out to study the effects of different design parameters on their working performance, energy dissipation capacity and failure characteristics. The test results show that the damper has strong plastic deformation capacity, good seismic performance and energy dissipation capacity. The hysteretic curve is symmetrical and full, which is similar with shuttle shape. The yield displacement is small, but the deformation capacity is strong. Properly increasing the width of bending element and the wall thickness of steel tube is helpful to energy dissipation. The finite element model of the damper is established, and the simulation results are in good agreement with the test results, which verifies the correctness of the finite element model and can provide some reference for related engineering applications.
6
Content available Porównanie strat mocy i sprawności silników w różnych wariantach rozwiązania
Bernatt Jakub, Gawron Stanisław, Glinka Tadeusz
Napędy i Sterowanie
|
2021
|
R. 23, nr 5
52--55
PL
Układy napędowe maszyn wyciągowych na szybach wydobywczych w kopalniach węgla kamiennego i rud miedzi bazują na silnikach prądu stałego wzbudzanych elektromagnetycznie. Sprawność energetyczna tych silników wynosi około 90%. W artykule przedstawiono silniki alternatywne: silnik prądu stałego wzbudzany magnesami trwałymi; silnik wzbudzany magnesami trwałymi i komutacją elektroniczną. Sprawność wymienionych silników jest większa, a ilość traconej energii w silnikach jest mniejsza.
EN
The drive systems of winding machines, on production shafts of coal mines and copper ores mines, are based on electromagnetically excited DC motors. The energy efficiency of these motors is around 90%. The alternative motors are presented in the article: DC motor excited by permanent magnets; a motor excited by permanent magnets and electronic commutation. The efficiency of these motors are greater, and the amount of energy lose in motors are smaller.
7
Content available Pseudo-static test of steel-glulam composite beam-to-column exterior joints
Duan Shaowei, Liu Xinglong, Yuan Jian, Wang Zhifeng
Archives of Civil Engineering
|
2021
|
Vol. 67, nr 1
147--161
EN
Steel-glulam structure is a new type of composite structure,glulam have lateral support effect on steel plate, that can prevent premature buckling of steel plate and improve the stability of steel structure. In order to study the influence of column’s cross-section form on the seismic performance of steel-glulam composite beam-to-column exterior joint, the column’s cross-section form was taken as the basic variable (glulam rectangular section , H-beam section and H-beam-glulam rectangular section were used respectively). The pseudo-static tests of three composite beam-to-column joints were carried out to observe the different failure modes, and obtain the mechanical performance indexes. The experiment results demonstrated that: The energy dissipation capacity of beam-to-column exterior joint composed of glulam column was the worst, the ultimate bearing capacity and stiffness were the lowest. The ultimate bearing capacity of the exterior joints formed by the H-beam column and the H-beam-glulam composite column were both high, and their ductility coefficients were similar, while the former had better energy dissipation capacity.
8
Content available Method of Determining the Surface Tension and Surface Energy of Tribological Wear Particles
Sadowski Jan
Tribologia
|
2020
|
nr 5
61--71
EN
Surface tension of friction wear product material is linked with unit mechanical work of newly-formed surfaces of solids. A definition of surface energy also addresses the thermal effect, which is indirectly connected with wear. Physical differences between the development of liquids and solids surfaces are discussed. Both of the quantities defined are described in analytical terms and their value is determined for a selected example of experimental testing. The discussion is based on the first law of thermodynamics using the concept of specific enthalpy of wear products. Boundaries of an area in space where mechanical energy is dissipated and dimensions of a wear particle being formed are taken into account. Mechanical and thermal parts of the energy balance are differentiated.
PL
Napięcie powierzchniowe materiału produktów zużycia tarciowego zostało powiązane z jednostkową pracą mechaniczną nowo utworzonej powierzchni ciał stałych. W definicji energii powierzchniowej uwzględniono również efekt cieplny, który jest pośrednio związany ze zużyciem. Podkreślono różnice o charakterze fizycznym między rozwojem powierzchni cieczy i ciał stałych. Obie zdefiniowane wielkości zostały opisane analitycznie, a ich wartości określono dla wybranego przykładu badań eksperymentalnych. Rozważania oparto na pierwszej zasadzie termodynamiki, w której wykorzystano koncepcję entalpii właściwej produktów zużycia. Uwzględniono granice obszaru przestrzennego, w którym energia mechaniczna jest rozpraszana, oraz wymiary powstałej cząstki zużycia. W bilansie energetycznym rozdzielono część mechaniczną i termiczną.
9
Content available Irreversibility of Friction and Wear Processes
Sadowski Jan
Tribologia
|
2020
|
nr 5
51--60
EN
Ways of energy dissipation by friction are analysed from a thermodynamic perspective. The non-equilibrium and irreversibility of processes in tribological systems are found to be sufficient conditions for Energy dissipation. M. Planck’s currently prevailing opinion that mechanical work can be converted into heat without limitations, e.g., by means of heat, is demonstrated not to apply to the friction of solids subject to wear. Ranges of work conversion into friction heat are determined. The generation of tribological wear particles is dependent on work of mechanical dissipation and its components – surface and volume work. A friction pair or its fragments, where energy is directly dissipated, are treated as open thermodynamic systems. The processes in place are described with the first law of thermodynamics equation. The effect of friction heat and the work of mechanical dissipation on variations of internal energy, enthalpy, and energy transferred to the environment as heat are defined. These dependences should be addressed when planning and interpreting tribological tests.
PL
W artykule zanalizowano sposoby rozpraszania energii przez tarcie z punktu widzenia termodynamiki. Stwierdzono, że nierównowaga i nieodwracalność procesów zachodzących w układach tribologicznych jest warunkiem wystarczającym do wystąpienia rozpraszania energii. Wykazano, że obwiązująca współcześnie opinia M. Plancka, że pracę mechaniczną można zamienić na ciepło bez ograniczeń, np. przez tarcie, nie dotyczy przypadków tarcia ciał stałych podlegających zużywaniu. Ustalono zakresy zamiany pracy na ciepło tarcia. Powstawanie cząstek zużycia tribologicznego uzależniono od pracy dyssypacji mechanicznej i jej elementów składowych – pracy powierzchniowej i objętościowej. Para cierna lub jej fragment, w którym rozpraszanie energii następuje bezpośrednio, potraktowano jako otwarty system termodynamiczny. Zachodzące procesy opisane zostały równaniem pierwszej zasady termodynamiki. Określono wpływ ciepła tarcia i pracy mechanicznej dyssypacji na zmiany energii wewnętrznej, entalpii i energii przekazywanej do otoczenia na sposób ciepła. Te zależności należy wziąć pod uwagę przy planowaniu testów tribologicznych i ich interpretowaniu.
10
Content available Dynamic analysis of thin-walled structures as energy absorbers
Mazurek Krzysztof, Szyguła Marek
Mining Machines
|
2020
|
no. 2
2--12
EN
In this work, a FEM dynamic analysis of the energy absorbing system was carried out on the example of a thin-walled column loaded with impact of mass. The results of the numerical analysis of the impact of the column cross-sectional shape and the notch on the amount of impact energy absorbed are presented. Modeling of phenomena occurring during impact is a very complex task, because it is necessary to analyze a complicated process in which geometric and physical nonlinearities and contact problems occur. Model preparation and calculation using the finite element method (FEM) is currently the most reliable method of modeling impacts. The results of numerical analyzes discussed in the paper were carried out using the special MSC.Software.
PL
W niniejszej pracy przeprowadzona została analiza dynamiczna układu pochłaniającego energię na przykładzie cienkościennej kolumny, obciążonej udarem masy. Przedstawiono wyniki analizy numerycznej wpływu kształtu przekroju poprzecznego kolumny oraz karbu na wielkość pochłoniętej energii uderzenia. Modelowanie zjawisk zachodzących podczas uderzenia jest bardzo złożonym zadaniem, gdyż należy przeprowadzić analizę procesu, w którym następują nieliniowości geometryczne i fizyczne oraz problemy kontaktu. Przygotowanie modelu i przeprowadzenie obliczeń przy użyciu metody elementów skończonych (MES) jest aktualnie najbardziej wiarygodną metodą modelowania uderzeń. Omówione w pracy wyniki analiz numerycznych uzyskano przy wykorzystaniu specjalistycznego programowania firmy MSC.Software.
11
Content available Analysis of composite shear walls with a gap between reinforced concrete wall and steel frame
Bahrami Alireza, Yavari Mojtaba
Archives of Civil Engineering
|
2020
|
Vol. 66, nr 1
41--53
EN
In this research, nonlinear analysis of composite shear walls (CSWs) with a gap between reinforced concrete wall and steel frame is investigated under cyclic loading by the use of the finite element method (FEM) software ABAQUS. For the purpose of the verification, an experimental test is modelled and comparison of its obtained result with that of the experimental test demonstrates an inconsiderable difference between them; therefore, the reasonable accuracy of the modelling is revealed. Then, effects of different parameters on the behaviour of the CSWs are examined. Gap size between reinforced concrete wall and steel frame, reinforcement percentage, steel sections of beams and columns, and existence of reinforced concrete wall are considered as parameters. It is concluded that change of the parameters affects the ultimate strength, ductility, and energy dissipation of the system. A steel shear wall (SSW) is also modelled and compared with the CSWs. Buckling of the walls is presented as well.
12
Content available Neural Networks in Crashworthiness Analysis of Thin-Walled Profile with Foam Filling
Rogala Michał
Advances in Science and Technology. Research Journal
|
2020
|
Vol. 14, no 3
93--99
EN
This article presents the numerical tests of thin-walled compressed columns with a square cross-section. The crush efficiency indicators were determined using the finite element method (Abaqus) and neural networks of MLP. The models had a constant circular trigger, with a diameter of 32 mm. During dynamic analysis, the samples were loaded with 1700 J. The numerical models were filled with aluminum foam from 40 mm to 180 mm every 20 mm. The study presents the conclusions for the thin-walled models with crushable foam.
13
Content available Porównanie strat mocy i sprawności silników w różnych wariantach rozwiązania
Bernatt Jakub, Gawron Stanisław, Glinka Tadeusz
Maszyny Elektryczne : zeszyty problemowe
|
2019
|
Nr 1 (121)
135--139
PL
Układy napędowe maszyn wyciągowych, na szybach wydobywczych w kopalniach węgla kamiennego i rud miedzi, bazują na silnikach prądu stałego wzbudzanych elektromagnetycznie. Sprawność energetyczna tych silników wynosi około 90%. W artykule przedstawiono silniki alternatywne: - silnik prądu stałego wzbudzany magnesami trwałymi, - silnik wzbudzany magnesami trwałymi i komutacją elektroniczną. Sprawność wymienionych silników jest większa, a ilość traconej energii w silnikach jest mniejsza.
EN
The drive systems of winding machines, on production shafts of coal mines and copper ores mines, are based on electromagnetically excited DC motors. The energy efficiency of these motors is around 90%. The alternative motors are presented in the article: - DC motor excited by permanent magnets, - a motor excited by permanent magnets and electronic commutation. The efficiency of these motors are greater, and the amount of energy lose in motors are smaller.
14
Content available remote A new hybrid energy dissipation system with viscoelastic and flexural yielding strips dampers for multi-level vibration control
Ranaei Omid, Aghakouchak Ali Akbar
Archives of Civil and Mechanical Engineering
|
2019
|
Vol. 19, no. 2
584--597
EN
In this study, a new hybrid damper (HD) is introduced that consists of elastomeric layers, which act as a viscoelastic damper (VED), and metallic dampers (MDs). Metallic part is composed of flexural yielding strips. This HD not only removes the limitations of each of these two types of dampers, but also facilitates its application for multi-level vibration control. Based on operational mechanism and design objectives of the proposed HD, three specimens have been manufactured and tested under quasi-static cyclic loading to evaluate the functional objectives. Two types of elastomers and two types of metallic dampers are used in these specimens. Experimental results show stable hysteretic behavior and high energy dissipation capacity. Also, the multi-phase behavior of the proposed HD confirms the proper function that is intended. However, the HD that is made of natural rubber (NR) and comb-teeth damper (CTD) can tolerate more cycles and possesses more ductility in comparison with the HD made of butyl rubber (IIR) and steel slit damper (SSD). A finite element model (FEM) is also used to simulate the behavior of the proposed HD. A good correlation between numerical outputs, analytical equations and experimental results indicates the accuracy of the proposed FEM.
15
Content available remote The impact of deepening the stilling basin on the characteristics of hydraulic jump
Siuta T.
Technical Transactions
|
2018
|
Vol. 115, iss. 3
173--186
EN
In this article, the results of computational fluid dynamic (CFD) modelling of the hydraulic jump conditions occurring in the experimental prismatic rectangular stilling basin with sudden crosswise expansion are presented. The FLOW 3D software program was used to numerically solve Reynolds Navier-Stokes (RANS) equations with the application of the k-ε turbulence model. The influence of the depth magnitude of the stilling basin and the ending sill installation on the hydraulic jump turbulent characteristics and submergence condition changes was investigated. Based on the results of the numerical modelling, it was found that various spatial flow processes contribute to the submergence condition of the hydraulic jump. These processes include: crosswise flow expansion within the stilling basin; local tail water surface level increase and total head loss due to vertical flow contraction; installation of the additional terminal sill. This contribution to the submergence condition allows a reduction in the required depth of the stilling basin, calculated on the basis of a one-dimensional simplified approach without consideration to the spatial characteristic of the hydraulic jump.
PL
W artykule przedstawiono przykład zastosowania techniki CFD (Numeryczna Mechanika Płynów) do modelowania warunków wystąpienia odskoku hydraulicznego w eksperymentalnej pryzmatycznej niecce wypadowej z nagłym poszerzeniem. W celu rozwiązania równań Reynolds Navier-Stokes (RANS) wraz z modelem turbulencji typu k-ε użyto programu FLOW 3D. Przedmiotem badania był wpływ głębokości niecki wypadowej i wysokości progu wylotowego na zmianę charakterystyki przepływu turbulentnego i warunki zatopienia odskoku. Na podstawie uzyskanych wyników modelowania stwierdzono, iż przestrzenne procesy przepływu, takie jak: poprzeczna ekspansja strumienia w niecce wypadowej, lokalne podniesienie poziomu zwierciadła wody dolnej na skutek kontrakcji pionowej przepływu w przekroju wyjściowym z niecki, instalacja progu wylotowego mogą przyczynić się w istotny sposób do zatopienia odskoku hydraulicznego, a tym samym pozwalają na redukcję wymaganej głębokości niecki wypadowej obliczanej na podstawie uproszczonej jednowymiarowej analizy przepływu bez uwzględnienia przestrzennego charakteru badanego odskoku hydraulicznego.
16
Content available remote Novel non-invasive seismic upgradation strategies for gravity load designed exterior beam-column joints
Kanchana Devi A. K., Karusala R., Tripathi M., Sasmal S.
Archives of Civil and Mechanical Engineering
|
2018
|
Vol. 18, no. 2
479--489
EN
Existing gravity load designed (GLD) structures are vulnerable to seismic event due to their inherent weaknesses. The present study, focuses on the development of non-invasive and feasible strategies for seismic upgradation of these non-seismically designed structures. Three novel schemes, namely (i) single haunch upgradation scheme (U1), (ii) straight bar upgradation scheme (U2) and (iii) simple angle upgradation scheme (U3) are proposed for seismic upgradation of GLD specimens. The efficacy and effectiveness of these upgradation schemes are evaluated by conducting the reverse cyclic load tests on control and upgraded GLD exterior beam-column sub-assemblages. The performance of the upgraded specimens is compared with that of the control GLD beam-column sub-assemblage, in terms of load–displacement hystereses, energy dissipation capacities and global strength degradation behaviour. Tremendous improvement in the energy dissipation capacity to the tune of 2.63, 2.83 and 1.54 times the energy dissipated by the control GLD specimen is observed in single haunch upgraded specimens, straight bar upgraded specimen and simple angle upgraded specimen respectively. The specimen with single haunch upgradation performed much better compared to the GLD specimens upgraded with the other two schemes, by preventing the brittle anchorage failure, delaying the joint shear damage and redirecting the damage partially towards the beam.
17
Content available Analysis of the mechanism of gas bubble break-up in liquids during the self-aspirating impeller operation
Stelmach J., Kuncewicz Cz., Musoski R.
Chemical and Process Engineering
|
2016
|
Vol. 37, nr 3
441--457
EN
Feasibility of a model of gas bubble break-up and coalescence in an air-lift column enabling determination of bubble size distributions in a mixer with a self-aspirating impeller has been attempted in this paper. According to velocity measurements made by the PIV method with a self-aspirating impeller and Smagorinski’s model, the spatial distribution of turbulent energy dissipation rate close to the impeller was determined. This allowed to positively verify the dependence of gas bubble velocity used in the model, in relation to turbulent energy dissipation rate. Furthermore, the range of the eddy sizes capable of breaking up the gas bubbles was determined. The verified model was found to be greatly useful, but because of the simplifying assumptions some discrepancies of experimental and model results were observed.
18
Content available Local Turbulent Energy Dissipation Rate in a Vessel Agitated by a Rushton Turbine
Šulc R., Pešava V., Ditl P.
Chemical and Process Engineering
|
2015
|
Vol. 36, nr 2
135--149
EN
The scaling of turbulence characteristics such as turbulent fluctuation velocity, turbulent kinetic energy and turbulent energy dissipation rate was investigated in a mechanically agitated vessel 300 mm in inner diameter stirred by a Rushton turbine at high Reynolds numbers in the range 50 000 < Re < 100 000. The hydrodynamics and flow field was measured using 2-D TR PIV. The convective velocity formulas proposed by Antonia et al. (1980) and Van Doorn (1981) were tested. The turbulent energy dissipation rate estimated independently in both radial and axial directions using the one-dimensional approach was not found to be the same in each direction. Using the proposed correction, the values in both directions were found to be close to each other. The relation /(N3·D2)  const. was not conclusively confirmed.
19
Content available Antiplane deformation of a bimaterial containing an interfacial crack with the account of friction 2. Repeating and cyclic loading
Sulym H., Piskozub L., Piskozub Y., Pasternak I.
Acta Mechanica et Automatica
|
2015
|
Vol. 9, no. 3
178--184
EN
The paper presents the exact solution of the antiplane problem for an inhomogeneous bimaterial with the interface crack exposed to the normal load and cyclic loading by a concentrated force in the longitudinal direction. Using discontinuity function method the problem is reduced to the solution of singular integral equations for the displacement and stress discontinuities at the domains with sliding friction. The paper provides the analysis of the effect of friction and loading parameters on the size of these zones. Hysteretic behaviour of the stress and displacement discontinuities in these domains is observed.
20
Content available remote Badanie analityczne i doświadczalne modelu połączenia ciernego tuleja – czop obciążanego wzdłużnie
Andrzejuk A.
Mechanik
|
2013
|
R. 86, nr 12CD
79--86
PL
Praca jest poświęcona badaniom rozpraszania energii modelu stożkowego połączenia ciernego tulei z czopem wału. W tym celu zbudowany został model matematyczny poddany obciążeniu zewnętrznemu podczas fazy ruchu ustalonego. W rozważaniach wykorzystano metodę analityczną oraz numeryczną. Do zbudowania modelu matematycznego układu mechanicznego jest wymagana postać zależności obciążenia w funkcji przemieszczenia czyli postać odwrotna w stosunku do otrzymanej z rozważań statycznych. Matematyczny opis tarcia konstrukcyjnego jest zagadnieniem skomplikowanym ze względu na opisanie stanu naprężeń i odkształceń oraz złożoność samego procesu tarcia. Dlatego opiera się on na uproszczonych założeniach, które dotyczą sił tarcia oraz rozkładu naprężeń i odkształceń. Przyjmując założenia, że siły tarcia podlegają prawu Coulomba, a własności materiału prawu Hooka. Zadanie dotyczy wyznaczenia przemieszczeń względnych, w zależności od obciążeń zewnętrznych i wyznaczenia oraz analizy pętli histerezy konstrukcyjnej badanego połączenia (rys.1).
EN
The article presents the problem of energy dissipation in a sleeve-pivot joint with structural friction. A comparative analysis was conducted to compare theoretical results obtained by means of the digital simulation method with the results of experimental research assisted by an MTS testing machine. This paper shows an outline of theoretical considerations, the method for conducting tests as well as selected comparative results.
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