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Applied Mechanics and Engineering
EN This paper presents the research of the authors did to determine the current state of two steam pipe-lines after 100 000 hours in function at 500°C and 10MPa. Chemical and metallographic analyses, mechanical tests and creep failure tests have been performed. The results of the creep tests were extra[...]
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International Journal of Applied Mechanics and Engineering
EN The paper presents the authors' research of the low alloy steel behaviour at high temperature. The short time testing and creep testing results are presented. Processing of the creep experimental results, a family of isochronous creep curves is obtained. Having constructed these curves, it is possib[...]
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Zeszyty Naukowe Politechniki Białostockiej. Mechanika
2001 Z.24 49-56
PL Cztery modele pełzania ze zniszczeniem zostały wykalibrowane dla stali P91 a następnie zaimplementowane w programie ABAQUS. Dokonano obliczeń różnych elementów rurociągu pary świeżej siłowni nadkrytycznej.
EN Four different creep models coupled with damage calibrated for P91 steel and implemented within the commercial ABAQUS code have been analysed for different element of live steam piping system within the supercritical power plant.
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Archives of Metallurgy and Materials
EN The paper presents the results of analysis of creep behaviour in short term creep tests of cast MAR-247 nickel-based superalloy samples made using various modification techniques and heat treatment. The accelerated creep tests were performed under temperature of 982 °C and the axial stresses of σ = [...]
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Transactions of the Institute of Fluid-Flow Machinery
2012 nr 124 5--15
EN The paper presents a model for creep basing on the so-called characteristic creep strain. It illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model which relates the stress exponent to the creep rupture strength and cur[...]
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Journal of Theoretical and Applied Mechanics
2005 Vol. 43 nr 2 241--256
PL W pracy przedstawiono badania dotyczące wpływu wstępnej deformacji plastycznej na proces pełzania miedzi i stopu aluminium. W doświadczeniach uwzględniono wplyw zmian temperatury na podstawowe parametry pełzania. Omawiane są również efekty zależne od rodzaju wstępnej deformacji. Dla obu badanych mat[...]
EN The influence of prior plastic deformation on the creep process is studied for copper and an aluminium alloy. Variations of basic creep parameters due to differences in temperature of realized tests are also taken into account. Moreover, the paper reports the prestraining effects depending on the ty[...]
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Archiwum Energetyki
2005 T. 34, nr 2 229-240
PL Względy bezpieczeństwa i potrzeba określania trwałości wysokociśnieniowych rurociągów parowych wymagają, kontroli diagnostycznej w ciągu całego okresu ich użytkowania. Jednym z ważniejszych składników są pomiary odkształceń związanych z pełzaniem. Wykorzystując wyniki prowadzonych od wielu lat badań[...]
EN With regard to safety and necessity of durability estimations, high-pressure steam pipelines require an efficient diagnostic procedure during whole operating period. One of the most important components of the standard procedure is measuring creep deformations. In this paper we present some represen[...]
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Journal of Achievements in Materials and Manufacturing Engineering
2012 Vol. 55, nr 2 403--409
EN Purpose: Material condition assessment with regard to required utility properties of Super304H austenitic steel for operation at elevated temperature. Design/methodology/approach: The structural and mechanical testing at room and elevated temperature after annealing at 650°C and 700°C for 1000 and 3[...]
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Transactions of the Institute of Fluid-Flow Machinery
2003 nr 113 235-247
EN This paper discussed chosen operation and diagnostic problems with steam turbines in steady states. Wear rate monitoring is the main goal. The material creep affects components wear under heat load in steady state. The paper presents the methodology of comprehensive diagnostic information developmen[...]
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Archives of Hydro-Engineering and Environmental Mechanics
EN This paper presents the results of a numerical simulation of a slope deformation process. The landslide slope “Grabina” inKoronowo near Bydgoszcz (Poland) serves as an example.Aslope profile located in the central part of the slope, between the main scarp and the toe of the landslide, was selected. [...]
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Journal of Polish CIMAC
2010 Vol. 5, no 3 113-120
EN In the paper there were presented changes of properties and microstructure in the specimens made of CuZn37 brass under fatigue test. During the analysis there were used parameters of hysteresis loop and microstructure changes for different levels of fatigue damage, that were registered during the te[...]
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Advances in Materials Science
EN Hydrogen entering at cathodic polarization produces the straining of Al. In the course of increased polarization, the elastic strain causing the up-hill diffusion of hydrogen present in metal and then the plastic deformation creating of hydrogen traps have been introduced. As a result, the unusual a[...]
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Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
2001 Z. 73 71-76
PL W pracy przedstawiono wyniki badań pełzania, stopu aluminium pod działaniem obciążeń statycznych oraz obciążeń cyklicznych w zł…ożonym stanie obciążenia, tj. rozciąganie ze skręceniem. Zbadano wpływ naprężeń cyklicznych na proces tworzenia się odkształceń pełzania przy stałym współczynniku amplitudy[...]
EN In the paper the results of creep testing of aluminium alloy under static and also cyclic loading in complex load states for tenison and torsion are presented. It was tested the effect of cyclic stress on process taking of creep deformations for constant value of stress intensity amplitude coefficie[...]
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Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika
2003 Z. 78 19-26
PL Silnie nieliniowe równania opisujące początkowo-brzegowe zagadnienia rozwoju uszkodzeń w konstrukcjach pracujących w warukach pełzania są pzryczyna braku zamkniętych rowiązań analitycznych i koniecznością poszukiwania rozwiązań na drodze numerycznej. Praca dotyczy doświadczeń autorów związanych z za[...]
EN The paper deals with the problem of damage growth in plates under creep conditions. Material properties are assumed to obey a non-stationary creep theory coupled with damage. The main interest was focused implementation of the computer system ABAQUS to anayse damage development prior to the first cr[...]
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Archives of Metallurgy and Materials
2016 Vol. 61, iss. 3 1315--1320
EN The service life of the repair welded joint of Cr-Mo / Cr-Mo-Y This paper presents the evaluation of the service life of dissimilar repair welded joint from Cr-Mo/Cr-Mo-V steel after 200,000 h service under creep condition. The investigations of microstructure using scanning electron microscopy, inv[...]
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Archives of Metallurgy and Materials
2016 Vol. 61, iss. 2B 1021--1029
EN The subject of the research was a material in the form of a ϕ38×4 pipe from HCM12 steel used for steam superheater coils in power boilers with supercritical and ultra-supercritical steam parameters. This article presents results of investigations of mechanical properties and microstructure of materi[...]
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Geology, Geophysics and Environment
2016 Vol. 42, no. 3 353--363
EN In this work the consolidation characteristics of the experimental and theoretical process of consolidation was studied. The analyses were carried out on the basis of the axial soil deformation progress and the pore pressure dissipation. The applied methodology gives possibility for the simultaneous[...]
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Journal of Theoretical and Applied Mechanics
2017 Vol. 55 nr 1 331--341
EN Rotating discs are the vital part of many kinds of machineries. Usually, they are operating at relatively high angular velocity and temperature conditions. Accordingly, in practice, the creep analysis is an essential necessity in the study of rotating discs. In this paper, the time dependent creep a[...]
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Journal of Theoretical and Applied Mechanics
2015 Vol. 53 nr 4 1053--1065
EN Assuming that the thermo-elastic creep response of the material is governed by Norton’s law and material properties, except Poisson’s ratio, are considered as a function of the radius of the spherical vessel, an analytical solution is presented for calculation of stresses and displacements of axisym[...]
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Engineering Transactions
EN The paper is concerned with the problem of creep buckling of a floating ice plate pressin against a rigid, vertical-walled, engineering structure of a finite lenght. The plate is modelled as a truncated wedge of a semi-infinite length and constant thickness, resting on a liquid base and subjected to[...]
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