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Wyświetlanie 1-15 z 69
Tytuł:
Analysis of Stress and Strain Fields in and around Inclusions of Various Shapes in a Cylindrical Specimen Loaded in Tension
Autorzy:
Neimitz, A.
Janus, U.
Powiązania:
https://bibliotekanauki.pl/articles/354166.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
void nucleation
inclusion fracture
critical
Opis:
A numerical analysis is performed of the stress field in and around inclusions of various shapes. Inclusions both stiffer and more compliant than the metal matrix are analysed. The critical stresses required for inclusion fracture are estimated after observation of cavities and inclusions by scanning electron microscopy. Real inclusions were observed after performing uniaxial loading to different amounts of overall strain. The material tested was Hardox-400 steel.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 569-576
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Melisso e il problema del vuoto: apologia e/o fraintendimento del monismo parmenideo?
Melissus and the Problem of the Void: Apology and/or Misapprehension of the Parmenidean Monism?
Autorzy:
Volpe, Enrico
Powiązania:
https://bibliotekanauki.pl/articles/938296.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Melissus
Parmenides
Leucippus
void
monism
Opis:
With respect to Parmenides’ thought Melissus was regarded as a dissident thinker already in antiquity. His polemical introduction of the concept of void and the relative idea of infinite Being seemed particularly controversial. The aim of the present paper is to examine the origins of the Melissian understanding of void in order to trace its philosophical genesis to the criticism of the Atomist Leucippus. According to the philosopher from Abdera, the Eleatic fundamental principles had to conform to the obviousness of bodies’ motion, which is why the Eleatic not-Being had to be understood as void. Melissus took issue with this view and criticized the idea of the void’s reality by means of a methodical argument. In the course of doing so, the philosopher from Samos distorted the original Parmenidean ontology, which is why his theories were often criticized severely as theoretically weak.
Źródło:
Peitho. Examina Antiqua; 2017, 8, 1; 91-106
2082-7539
Pojawia się w:
Peitho. Examina Antiqua
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voids Nucleation at Inclusions of Various Shapes in Front of the Crack in Plane Strain
Autorzy:
Neimitz, A.
Janus, U.
Powiązania:
https://bibliotekanauki.pl/articles/958206.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
void nucleation
inclusion fracture
critical stress
Opis:
An analysis is presented of the stress field in and around inclusions of various shapes. Results were obtained by the finite element method. Inclusions were located within elementary cells located at the centre of the specimen next to the crack front. The influence of an in-plane constraint on the stress distribution was tested.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1587-1592
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forming Limit Diagram, Void Analysis, Strain Distribution and Surface Roughness for SS430 Sheets During Multipoint Incremental Forming
Autorzy:
Ramkumar, K.
Paulraj, G.
Elangovan, K.
Sathiya Narayanan, C.
Powiązania:
https://bibliotekanauki.pl/articles/354796.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FLD
SPIF
MPIF
void coalescence
strain distribution
Opis:
Single point incremental forming process is a most economical Die-less forming process. The major constraint of it is that it is a time consuming process. In this work, a new attempt was made in incremental forming process using Multipoint tool for SS430 sheets to increase the formability and to reduce forming time. Fractography analysis was made to study the size of voids that were formed during fracture. The forming limit diagrams were drawn and compared for single point incremental forming and the multipoint incremental forming of SS430 sheet. It was proved that the formability of SS430 sheet in the multipoint forming was better than the formability of that in single point forming and the time consumed was reduced. The strain distribution in both processes had also been studied along with surface roughness.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1709-1714
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of concrete voids in an untypical railway bridge pillar by Ground Penetrating Radar Method
Autorzy:
Owerko, P.
Ortyl, Ł.
Salamak, M.
Powiązania:
https://bibliotekanauki.pl/articles/114703.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
NDT
GPR
bridges
reinforced concrete
void identification
Opis:
The article presents the results of non-destructive testing, which was carried out on the concrete pillar with an unusual, trapezoidal shape and densely spaced reinforcement. After stripping the formwork, some surface voids became visible, which suggested that the existence of subsurface voids was also probable. The Ground Penetrating Radar method (GPR) was used to state whether these voids are formed and possibly to determine their approximate location. This paper discusses the adopted methodology of measurements, analysis and the GPR data processing. The interpretation of the echograms was based on a comparison of recorded GPR data with the modelling results MRS (FD) of electromagnetic wave propagation with the known geometry of the tested pillar. The results of detection are shown mainly in the form of the echograms (B-SCAN) and are collected as a cumulative sketch (C-SCAN). In order to assess the impact of the identified voids on the bearing capacity of the structure, the shell model of the pillar was built with the use of FEM. It shows stress distribution differences in the pillar with a continuous internal structure and in the pillar with the modelled voids. The obtained results were used for checking the bearing capacity of damaged pillar and during the preparation of the effective repair program.
Źródło:
Measurement Automation Monitoring; 2015, 61, 3; 76-80
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on deformation-induced damage evolution for Inconel718 superalloy with the use of an innovative single-specimen method
Autorzy:
Socha, G.
Madejski, B.
Malicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/279811.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
damage
accumulated plastic strain
superalloy
void growth
Opis:
An innovative method for investigation of deformation-induced damage of elastic-plastic materials is proposed. A static tension test, performed on a specimen with a variable cross- -section gage part enabled analysis of degradation of the material structure for all stages of permanent deformation. Modified Johnson model has been used to quantify damage. Analysis of the damage of the specimen surface as well as observations of the damage induced inside the gage part of the specimen has been performed using SEM observations. Debonding at the interface between a hard inclusion and a ductile matrix has been found to be responsible for initiation of cracks on the specimen surface as well as inside the gage part of the specimen. Analysis of the subsequent void growth has been performed. Surface cracks are associated with plastic deformation resulting in an increase of the surface roughness. Variations of the specimen surface roughness have been found to be in good correlation with the damage parameter. This correlation enables the use of surface roughness as the relative damage indicator for the investigated material and deformation mode.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1379-1390
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The consistency conditions for density limits of hypoplastic constitutive law
Autorzy:
Niemunis, A.
Nübel, K.
Karcher, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/1954564.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
hypoplasticity
intergranular strain
phase diagram
limit void ratio
Opis:
The so-called phase diagram of grain skeletons illustrates the range of possible void ratios between the pressure dependent bounds ei and ed. It can be shown that in the framework of the actual hypoplastic model these bounds can be surpassed by particular deformation paths. This inconsistency is particularly acute in recently proposed FE-calculations with density fluctuations. Here we propose a modification to render the formulation consistent.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 409-420
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of dynamic growth of a micro-scaled void based on strain gradient elasto-plasticity
Autorzy:
Ma, Xinbing
Liu, Jinxing
Wang, Jiadong
Pan, Hao
Powiązania:
https://bibliotekanauki.pl/articles/1839598.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
dynamic void growth
size effect
inertia
thermal softening
Opis:
Void initiation and growth serve as an important mechanism in ductile failures in metals. Particularly, on the micron-level, the extra hardening effect associated with strain gradient is accounted for by adopting strain gradient elasto-plasticity instead of the conventional plasticity. Effects of inertial, strain gradient hardening and thermal softening are formulated analytically for the case where a spherical void expands under external hydrostatic stress. As demonstrated by our results, the inertia effect firstly tends to hinder but then promotes the void growth. The threshold stress required for rapid void growth is lifted due to extra hardening of strain gradient so that the growth of a smaller void is delayed more remarkably. A considerable thermal softening phenomenon is observed here, which is caused by plastic work during the deformation process. The final void growth rate is mainly related to the maximum loading, which is consistent with the prediction based on the classical plastic theory.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 927-941
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of the pressure and density sensitive behaviour of sand within the framework of hypoplasticity
Autorzy:
Bauer, E.
Powiązania:
https://bibliotekanauki.pl/articles/1954566.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
hypoplasticity
element test
void ratio
critical state
granular materials
Opis:
In this paper a hypoplastic model proposed by Gudehus and Bauer is presented which is apt to describe the mechanical behaviour of loose and dense sand within a wide range of pressures and densities using a single set of constants. State changes are assumed to depend on the current void ratio, the Cauchy stress tensor and the stretching tensor. The constitutive equation is of the rate type and based on non-linear tensor-valued functions. By including a pressure dependent relative density the hypoplastic model describes the influence of pressure and density on the incremental stiffness, the peak friction angle and on the void ratio in a stationary state. The performance of the hypoplastic models is discussed and the results of numerical simulations are compared with experiments.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 367-387
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Nothingness of the Anguish in Søren Kierkegaard’s work as Modernity’s Infernal Redemption
Autorzy:
Ormeny, Francisc-Norbert
Powiązania:
https://bibliotekanauki.pl/articles/628514.pdf
Data publikacji:
2015
Wydawca:
Fundacja Pro Scientia Publica
Tematy:
anguish, communication with an undetermined differential, nothingness, void, individualization
Opis:
The intention of this short study is to discuss the reverberations of Søren Kierkegaard’s  philosophical considerations on anguish and on void in the context of the latest postmodern theoretical trends (Ben Woodard’s dark vitalism), by presenting the mechanisms by means of which the anguish gets to produce an  “existential switch” which extracts the individual from the register of disintegration and introduces him into the register of the project (Heideggerianly speaking). I will try to demonstrate the compatibility between the structures of the late modernity and the Kierkegaardian vision on tension and on paradox, and will I will attempt to connect the possible findings to the relevant and congenial phenomenological, existentialist and aesthetic theories or set of theories circulating in today’s exegetical canon.
Źródło:
Journal of Education Culture and Society; 2015, 6, 1; 11-19
2081-1640
Pojawia się w:
Journal of Education Culture and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urban void as a potential of the contemporary city development
Pustka przestrzenna jako potencjał rozwoju współczesnego miasta
Autorzy:
Pluta, Agata
Powiązania:
https://bibliotekanauki.pl/articles/434759.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
urban void
temporary use
city
urban planning
potential
adaptability
Opis:
A city is a cluster of buildings and areas of activity. The spaces between urban structures are often treated as a side effect, an accidental phenomenon present due to the location of buildings. However, in contrast to the buildings that have their functions established once they are erected, urban voids contain the potential for rapid change of use constituting an important element of both planned and unplanned activities. Empty spaces are possibilities for future arrangements and evolution of needs that are often unknown at the time of construction. The main objective of the article is to define the concept of ‘urban void’ and to analyze the hidden potential of it. The author emphasizes the need to create empty spaces as deliberately as architecture itself, including them in the urban tissue.
Źródło:
Biblioteka Regionalisty; 2017, 17; 95-104
2081-4461
Pojawia się w:
Biblioteka Regionalisty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the temperature field using liquid crystal thermography and analysis of two-phase flow structures in research on boiling heat transfer in a minichannel
Autorzy:
Piasecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/220691.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
temperature measurement
liquid crystal thermography
measurement accuracy
void fraction
Opis:
The paper presents the application of liquid crystal thermography for temperature determination and visualisation of two phase flow images on the studied surface. Properties and applications of thermochromic liquid crystals are discussed. Liquid crystals were applied for two-dimensional detection of the temperature of the heating foil forming one of the surfaces of the minichannel along which the cooling liquid flowed. The heat flux supplied to the heating surface was altered in the investigation and it was accompanied by a change in the color distribution on the surface. The accuracy of temperature measurements on the surface with liquid crystal thermography is estimated. The method of visualisation of two-phase flow structures is described. The analysis of monochrome images of flow structures was employed to calculate the void fraction for some cross-sections. The flow structure photos were processed using Corel graphics software and binarized. The analysis of phase volumes employed Techsystem Globe software. The measurement error of void fraction is estimated.
Źródło:
Metrology and Measurement Systems; 2013, 20, 2; 205-216
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage evolution of vehicle motor rotor under single working condition based on GTN model
Autorzy:
He, Liange
Yuan, Zhou
Shi, Wenjun
Qu, Xiang
Powiązania:
https://bibliotekanauki.pl/articles/2200831.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
motor rotor
GTN model
parameters fitting
void evolution
Opis:
To study evolution of the void in the material of a motor rotor under different working conditions from a mesoscopic perspective, damage analysis of the rotor has been carried out based on thermal-mechanical coupling theory. According to the test methods of GB/T 228.1-2010 Part 1 and GB/T 228.2-2015 Part 2, tensile tests were conducted on rotor ma- terials at different temperatures to obtain basic mechanical property parameters, and pa- rameters of the fine-scale damage model at different temperatures were fitted by combining orthogonal tests and a finite element inverse calibration method. Then, the accurate tem- perature distribution law of the motor rotor was obtained through CFD calculation. Based on the material parameters and temperature data, the void evolution of the rotor material under thermal-mechanical load was studied by using the finite element method. The results show that: under the rated conditions, the stress concentration of the rotor is mainly ap- peared in the joint with the shaft, the maximum stress was 304.1MPa, which did not reach the yield limit of the material. No plastic deformation occurred, so the volume fraction of voids inside the rotor material did not change still for the initial pore volume fraction of 2.5 · 10−3. In the peak condition, the stress concentration appeared in the rotor plate across the joint of the magnetic bridge and pole shoe with a maximum stress of 354.4MPa and a small plastic strain of 1.133 ·10−3. The pore volume fraction increased to 2.503 ·10−3, where the initial pore growth of 2.150 · 10−6 and the secondary pore nucleation of 2.079 · 10−12.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 561--577
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of heterogeneity on shear zone formation during plane strain compression
Autorzy:
Tejchman, J.
Powiązania:
https://bibliotekanauki.pl/articles/241506.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
heterogeneity
mean grain diameter
polar continuum
shear zone
void ratio
Opis:
Heterogeneity of granular materials triggers shear zone formation. In the paper, the FE-analysis of the effect of the material heterogeneity on the formation of a spontaneous shear zone inside of granular materials during a plane strain compression test is presented. The numerical calculations are performed with a finite element method on the basis of a hypoplastic constitutive law extended by polar quantities: rotations, curvatures and couple stresses. A mean grain diameter is used as a characteristic length. The constitutive law takes into account the effect of pressure, void ratio, direction of deformation rate and mean grain diameter on the behaviour of granular bodies. The heterogeneity in the granular body is assumed in the form of spots with a different initial void ratio. The spots are single or distributed randomly and stochastically with an exponential probability function. The single spots are distributed sparsely and densely in an initially dense and loose granular specimen. Special attention is focused on the effect of heterogeneity on the onset of shear localization and its thickness at residual state.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 2; 149-181
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mallarmé et les paradoxes de la vanité
Mallarmé and the paradoxes of vanity
Autorzy:
Opiela-Mrozik, Anna
Powiązania:
https://bibliotekanauki.pl/articles/483636.pdf
Data publikacji:
2018
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Wydawnictwo Werset
Tematy:
Mallarmé
vanity
nothingness
void
death
vanité
néant
vide
mort
Opis:
This article analyses a polysemous term of vanity in Mallarmé ’s idea and œuvre. This concept shows paradoxes of Mallarmé ’s creation: a misunderstood poet accused of being vain who was torn between the dream of glory and the self-devalu-ation. It was in the autoreflexive art par excellence, where Mallarmé saw his satisfac-tion and found the sense of life. After the experience of spiritual crisis and the discov-ery of worthlessness of language, Mallarmé, finding in the Nothingness the resources of poetry, decided to extend the illusion of literature. “Digging into the line”, he built the poetics of vanity which is a synonym of futility or void where the sense of word is replaced by the language sonority. What is more, while fighting against the poetic impotence, Mallarmé, due to writing about Vanitas, immersed into death to create an “ideal tomb” for his late son.
L ’article analyse la notion polysémique de vanité dans la pensée et dans l ’œuvre de Mallarmé. Le concept dévoile les paradoxes de la création mallarméenne : le poète jugé obscur et accusé de vanité, était déchiré entre le rêve de gloire et l ’autodé-valorisation. C ’est dans l ’Art auto-réflexif par excellence qu ’il projetait sa satisfaction d ’artiste et trouvait un sens de la vie. Mais ayant vécu une crise spirituelle et décou-vert la vanité du langage, Mallarmé a choisi de prolonger une illusion de la littérature en trouvant dans le Néant les ressources de sa poésie. À force de « creuser le vers », il construit donc une poétique de la vanité qui reste synonyme d ’inanité ou de vide où le sens des mots est relayé par la sonorité du langage. En plus, tout en luttant contre la stérilité poétique, à travers l ’écriture des Vanités, Mallarmé s ’immerge dans la mort afin de créer un « tombeau idéal » pour son fils disparu.
Źródło:
Quêtes littéraires; 2018, 8; 116-125
2084-8099
2657-487X
Pojawia się w:
Quêtes littéraires
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 69

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