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1

Ekologiczno-ekonomiczne rozwiązania techniczne w sektorze motoryzacyjnym. Cz. 2, Rozwiązania ingerujące w pracę silnika

100%

Wójcik M.

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2019

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tom R. 20, nr 1-2

47--52

PL

Szybkie tempo rozwoju sektora motoryzacyjnego w ostatnich latach jest jednym z głównych zagrożeń społecznych i ekologicznych. Proekologiczne działania w motoryzacji uwzględniane są obecnie na wszystkich etapach projektowania, produkcji, użytkowania oraz finalnej utylizacji. Zmniejszenie szkodliwego oddziaływania pojazdów na środowisko można osiągnąć poprzez stosowanie ekologicznych materiałów konstrukcyjnych lub montowanie w pojazdach systemów wpływających na zmniejszenie zużycia paliwa. Rozwiązania konstrukcyjne, w szczególności zastosowanie materiałów ulegających biodegradacji lub pochodzących z recyklingu w produkcji pojazdów opisano w pierwszej części artykułu. W poniższej publikacji omówiono systemy ingerujące w pracę silnika, które w połączeniu z ekologiczną jazdą pozwalają ograniczyć szkodliwy wpływ motoryzacji na środowisko. Wykonano również wstępne analizy ekonomiczne uwzględniające wpływ zastosowania ekologicznych systemów w pojazdach na obniżenie rocznych kosztów zakupu paliwa.

EN

Nowadays, the fast growing of the automotive sector is one of the main social and environmental risks in the world. „Green” solutions in an automotive sector are included in designing, production, exploitation and the final utilization of vehicles. The reduction of harmful impact of vehicles on the environment might be achieved by the use of ecological construction materials or by the assembly of systems which influence the fuel consumption. Construction innovations, especially the application of biodegradable and recycled materials in an automotive sector, were showed in the first part of article. This paper presents the technologies which influence the operation of the engine. The aforementioned solutions in conjunction with the eco-driving can limit the harmful impact of the automotive sector on the environment. The initial economic analysis associated with the application of ecological innovations in vehicles and their impact on the annual cost of the acquisition of fuel was also presented.

2

The Coupled Eulerian-Lagrangian Analysis of the KOBO Extrusion Process

63%

Wójcik M. , Skrzat A.

Advances in Science and Technology. Research Journal

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2021

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tom Vol. 15, no 1

197--208

EN

The KOBO extrusion is an unconventional elastic-plastic deformation process in which the phenomenon of chang- ing a path of plastic deformation due to die cyclic oscillations by a given angle and with a given frequency is applied. As the result of the application of the oscillating rotary motion of the die, the reduction of the extrusion force was obtained. The numerical study of the KOBO extrusion of metallic materials was presented in this paper. The three-dimensional coupled Eulerian-Lagrangian (CEL) analysis was applied. The relationship between the extrusion force and the punch displacement during the KOBO process was achieved. The effective plastic strain distribution in the butt was found. The results of the numerical computations were compared with the experimen- tal data. The influence of the material hardening parameters on the cyclic loading phenomena (ratcheting, mean stress relaxation) in terms of the course of the KOBO extrusion was also examined. The proper determination of the material hardening parameters can help to optimize the KOBO process in terms of the reduction the extrusion force and the choice of the amount of die oscillations.

3

The application of Chaboche model in uniaxial ratcheting simulations

63%

Wójcik M. , Skrzat A.

Advances in Manufacturing Science and Technology

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2020

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tom Vol. 44, nr 2

57--61

EN

This article presents the application of Chaboche nonlinear kinematic hardening model in simulations of uniaxial ratcheting. First, the symmetrical strain-controlled cyclic tension/compression tests for PA6 aluminum samples were done. Using the experimental stress–strain curve, initial material hardening parameters were determined by the ABAQUS software. The experimental curve was compared with the numerical one. For better fitting of both curves, the optimization procedure based on the least-square method was applied. Using the determined hardening parameters, numerical simulations of the ratcheting were done by the finite element analysis software. Numerical results were then compared with the experimental data obtained in the stress-controlled cyclic loading test.

4

Numerical Modeling of Superplastic Punchless Deep Drawing Process of a TI-6AL-4V Titanium Alloy

63%

Skrzat A. , Wójcik M.

Advances in Science and Technology. Research Journal

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2020

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tom Vol. 14, no 1

127--136

EN

The numerical results of superplastic punchless deep drawing of the Ti-6Al-4V titanium alloy were presented in this paper. The material behavior subjected to the forming process was characterized by deformation-microstructure constitutive equations including the grain growth. Superplastic stress-strain characteristics used in the numerical simulations were computed with the application of authorial program. The explicit integration scheme is used in solving differential equations. The numerical simulations of the super-elastic deep drawing were made with finite element method analysis. The von Mises stress distribution in the blow-forming process was obtained. The possible faults of extrusions caused by the improper load history as well as unsuitable pressure were also presented in this paper. The numerical simulations included in this research allow for the proper choice of material and drawing parameters which can help to optimize the superplastic forming process.

5

An Elastic-Plastic Analysis of Polycrystalline Structure Using Crystal Plasticity Modelling – Theory and Benchmark Tests

63%

Wójcik M. , Skrzat A.

Advances in Science and Technology. Research Journal

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2022

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tom Vol. 16, no 5

163--177

EN

Numerical simulations of tension and shear tests for a polycrystalline, anisotropic material were performed using crystal plasticity theory. The slip was considered here as the main mechanism of plastic deformation. Constitutive equations to describe the elastic-plastic deformation caused by the slip are presented. The generation and meshing of various shapes geometries (cubic and paddy shapes) with randomly-orientated grains by means of open source program NEPER program was shown. The Voronoi tessellation was used in order to include morphological properties of a crystalline material. The selected results of elastic-plastic analyses (stress, strain distributions and the macroscopic stress-strain resulting from homogenization) are presented here. The results obtained show the non-uniform distribution of stress and strain for different grains associated with their crystal orientation. The crystal plasticity finite element modelling of materials subjected to plastic deformation is important for microstructure-based mechanical predictions, as well as for the engineering design and to perform simulations involving not only the change of a material’s shape at a macro level but also the phenomena occurring in material in a micro-scale.

6

Coupled Thermomechanical Eulerian-Lagrangian Analysis of the KOBO Extrusion Process

63%

Wójcik M. , Skrzat A.

Archives of Metallurgy and Materials

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2022

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tom Vol. 67, iss. 3

1185--1193

EN

Numerical simulations of the KOBO extrusion process are presented in this paper. The coupled thermomechanical Eulerian-Lagrangian approach was applied for the three-dimensional finite element model. The dynamic explicit Euler forward method was used in numerical calculations. The elastic-plastic Chaboche model assuming isotropic and kinematic hardening under variable temperature conditions was applied to describe the behaviour of the material under cyclic loading. In numerical computations Chaboche material model implemented in commercial software, as well as the proprietary one written as FORTRAN procedure were tested. The numerical results present the stress and strain distributions in the extruded material, as well as an increase of temperature due to the plastic work and friction. The shape of plastic strain zones was verified experimentally. The approach presented in the paper is a promising numerical tool to simulate the KOBO process.

7

Influence of sewage sludge conditioning with use of biomass ash on its rheological characteristics

63%

Wójcik M. , Stachowicz F.

Archives of Environmental Protection

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2019

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tom Vol. 45, no. 1

92--102

EN

This study presents the rheological properties of sewage sludge after conditioning with the application of biomass ash. The impact of sewage sludge pre-treatment on its viscosity, flow curves and thixotropy was investigated. The increase of shear stress and the decrease of viscosity were observed with the increase of shear rate. Obtained results were compared with raw sewage sludge and the sludge after modification by means of polyelectrolyte in the dosage of 1.5 g‧(kg d.m.)-1. The findings proved that samples of raw and conditioned sewage sludge had thixotropic characteristics. The correlation between moisture content and capillary suction time reduction as well as selected rheological parameters were also determined. On the basis of the obtained results it was stated that the Ostwald de Vaele model best fits the experimental data.

PL

Artykuł przedstawia wyniki badań dotyczących wpływu kondycjonowania osadów ściekowych z użyciem popiołów ze spalania biomasy na ich charakterystykę reologiczną. Zbadano lepkość oraz właściwości tiksotropowe osadów po ich kondycjonowaniu. Odnotowano wzrost naprężeń stycznych wraz ze wzrostem prędkości ścinania. Uzyskane rezultaty porównano z wynikami badań dla surowego osadu, jak i dla osadu kondycjonowanego z użyciem polielektrolitu w dawce 1,5 g(kg s.m.)-1. Stwierdzono również, że próbki kondycjonowanych osadów ściekowych wykazują właściwości tiksotropowe. Wyznaczono również zależności pomiędzy uwodnieniem, czasem ssania kapilarnego oraz wybranymi parametrami reologicznymi osadów. Na podstawie uzyskanych rezultatów stwierdzono, że najlepsze dopasowanie wykazuje model Ostwalda de Vaele.

8

Crystal plasticity elastic-plastic rate-independent numerical analyses of pollycrystalline materials

51%

Wójcik M. , Skrzat A. , Stachowicz F. , Spišák E.

Advances in Mechanical and Materials Engineering

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2023

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tom Vol. 40, nr 1

63--78

EN

Macroscopic analyses of plastic forming processes give only the overall description of the problem without the consideration of mechanisms of plastic deformation and the microstructure evolution. For the consideration of these processes, numerical simulations within crystal plasticity include the change of texture, anisotropy, and strain hardening of the material are used. In this paper, a crystal plasticity rate-independent model proposed by Anand and Kothari is applied for numerical analyses of polycrystalline materials. The slip was considered as the main mechanism of the plastic deformation. Basic constitutive equations of crystal plasticity for large deformation theories are presented. The selected results of elastic-plastic problems obtained using both macro- and micro- scales software for the explicit and implicit integration are featured here. The heterogeneous distribution of strain and stress in different grains are obtained, which is associated with the various crystal orientation. The crystal plasticity modelling of materials subject to plastic deformation involves not only the information about the change of a material’s shape in a macro-scale, but also describes the phenomena occurring in material in a micro-scale.

PL

Analizy makroskopowe procesów przeróbki plastycznej prezentują jedynie ogólny zarys rozważanego problemu, bez uwzględnienia mechanizmów odkształcenia plastycznego oraz ewolucji mikrostruktury. W celu rozważania procesów przeróbki plastycznej stosowane są symulacje numeryczne w ramach teorii plastyczności kryształów uwzgledniające zmianę tekstury, anizotropię oraz umocnienie odkształceniowe. W artykule zaprezentowano zastosowanie modelu Ananda i Kothari w ramach teorii plastyczności kryształów niezależnej od prędkości odkształcenia do rozwiązywania analiz numerycznych dla materiałów polikrystalicznych. W badaniach uwzględniono poślizg dyslokacyjny jako główny mechanizm odkształcenia plastycznego. Zaprezentowano wybrane rezultaty dla problemów sprężysto-plastycznych uzyskane zarówno w skali makro, jak i mikro- dla całkowania typu explicit i implicit. Uzyskano niejednorodny rozkład naprężenia i odkształcenia w poszczególnych ziarnach, związany z różną orientacją kryształów. Modelowanie numeryczne zzastosowaniem teorii plastyczności kryształów dla materiałów poddanych plastycznemu odkształceniu dostarcza nie tylko informacje o zmianie kształtu materiału w skali makro, ale także opisuje zjawiska zachodzące w materiale w skali mikro-.

9

Unconventional Materials from Sewage Sludge with a Potential Application in a Road Construction

51%

Wójcik M. , Bąk Ł. , Stachowicz F.

Advances in Science and Technology. Research Journal

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2018

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tom Vol. 12, no 4

65--75

EN

Limited possibilities of agricultural utilization of sewage sludge results in the development of unconventional methods of its final management. Recently, recycling of sewage sludge in road construction is under examination. Literature review mentions that properly prepared sludge might replace other conventional materials which are commonly used in a construction sector. In this paper, the proposition of the use of sewage sludge in the production of unconventional material for a road construction is presented. In laboratory tests, dewatered sewage sludge with the moisture content at the level of 62%, glass powder and quartz sand were applied. For the obtained product, physical and chemical characteristics were examined. The compressive strength and the hardness were also measured. The results were compared with other materials which are also used in construction sector. The research confirmed the possibility to produce a material from different fractions of waste, which might indicate usefulness in civil engineering.