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1
Content available Stress-strain model for confined fiber-reinforced concrete under axial compression
Sabariman B., Soehardjono A., Wisnumurti, Wibowo A., Tavio
Archives of Civil Engineering
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2020
|
Vol. 66, nr 2
119--133
EN
Confinement in concrete can improve the descending branch of the stress-strain relationship of concrete. The addition of steel fiber in concrete can also improve the descending branch of the stress-strain relationship of concrete. The combination of the use of both can double the impact significantly on the post-peak response. It can be seen from the trend of the post-peak response that the values of both 0.85fccf and 0.5fccf can be well predicted. The study involved an experimental investigation on the effect of confinement on square column specimens reinforced with steel fiber. From the experimental program, it is proven that the use of combination of confining steel and steel fiber works very well which is indicated by the better improvement on the post-peak response. The proposed equations can predict the actual stress-strain curves quite accurately which include the effects of confinement parameters (Zm) and steel fiber volumetric parameter (Vf).
2
Content available remote Long-term effect of different particle size distributions of waste glass powder on the mechanical properties of concrete
Omer Brwa, Saeed Jalal
Architecture Civil Engineering Environment
|
2020
|
Vol. 13, no. 4
61--75
EN
In this paper, a comprehensive experimental investigation was conducted into the effect of the particle size distributions (PSDs) and percentages of waste powdered glass as a partial replacement of cement on the long-term mechanical behavior of concrete produced at two different cement levels. For this purpose, two different mixtures of concrete were used as reference mixtures; the first has a relatively low cement content (331 kg/m3), and the second has a relatively high cement content (490 kg/m3). Two different PSDs of glass powder (GP) labeled GP-A and GP-B ((55 μmGP-B) were used, and the considered GP content for the low cement content mixture (LCCM) and the high cement content mixture (HCCM) were (0%, 5%, and 10%) and (0%, 5%, 10%, and 15%) by weight of cement, respectively. The mechanical performance of all concrete mixtures at 180 days was investigated and evaluated in related tests as compressive strength and toughness, splitting and flexural tensile strength, elastic modulus, and compressive stress-strain behavior. The experimental results generally indicated that the compressive strength of GP-modified concrete improved significantly over the long-term age (180-days) compared to the early age (28-days). The contribution of PSDs of GP to enhancing the mechanical properties of concrete is insignificant compared to its replacement amount. Finally, independent of the PSDs, the incorporation of 10% GP for LCCM and 15% of GP for HCCM has a positive effect on the long-term mechanical properties of concrete, indicating that GP can be used as a replacement for cement.
3
Content available remote Analysis of the characteristics of magnetic properties change in the rock failure process
Zhang He, Sun Qiang, Zhenlong Ge
Acta Geophysica
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2020
|
Vol. 68, no. 2
289--302
EN
It is difcult to observe changes in the internal structure of natural rocks when under certain pressure ranges. However, such rocks have specifc magnetic properties that are established during their formation process. Through studying changes in their magnetic properties while under pressure, which are readily observed and analyzed, as combined and contrasted with their associated structural changes, the relationship between the stress–strain and the magnetic feld intensity can be established. Based on the stress–strain and magnetic feld strength data obtained from the relevant literature, the process of rock and rock-like mechanical failure can be divided into three stages: elastic, plastic, and rupture. The performances of diferent rocks during these stages were analyzed, and there was an obvious transition point between any two adjacent stages. Thus, this study provides theoretical support to establish the relationship between structure and magnetic variations of rocks and rock-like bodies.
4
Content available Hardness prediction of a cold rolled Nimonic 80A exhaust valve spindle
Kang S. W., Heo S. J., Yoo J. H., Kang J. H.
Journal of Achievements in Materials and Manufacturing Engineering
|
2019
|
Vol. 94, nr 1-2
13--21
EN
Purpose: of this paper is to predict the hardness of cold rolled exhausts valve spindle fabricated of Nimonic 80A via axisymmetric finite element analysis, compression testing, and hardness inspection. Design/methodology/approach: The stress-strain relationship of Nimonic 80A was obtained via compression testing with deformation ratios of 10%, 20%, and 30%. Hardness changes caused by the strain hardening effect were measured in cut specimens in both the axial and circumferential directions following compression testing. The effective strain at the measurement position was calculated via finite element analysis. The regression equation for hardness changes caused by work hardening was derived from analysed strain and inspected hardness. The cold-rolling deformation of an exhaust valve spindle was analysed using axisymmetric finite element analysis. Findings: The stress-strain relationship calculated from compression testing was well expressed using the Holloman equation and the strain-hardness relationship by strain hardening was successfully regressed using the shifted power law model for Nimonic 80A, Nickel-Chromium based super alloy. Research limitations/implications: This research focused hardness prediction of spindle after ring rolling operation for generating beneficial compressive surface residual stresses for enhancing fatigue life. Further research to quantify compressive residual stress after rolling shall be followed to increase fatigue life. Practical implications: The cold rolling process is a typical incremental forming method and should be analysed under three-dimensional conditions. However, it takes lots of time to solve incremental forming analysis. To predict hardness distribution after rolling in the manufacturing field, FE analysis was performed under two-dimensional axisymmetric conditions based on the assumption of no friction generated by the rolling tool. The deformed shapes and hardness distribution from the inspection quality standard and two-dimensional FE analysis showed very similar results. Simplified finite element analysis method for ring rolling process for local area could be very effective method in the industrial field. Originality/value: The stress-strain relationship and the hardness and strain relationship were derived by compression test and hardness measurement for compressed specimen for Nimonic 80A, Nickel-Chromium based super alloy. And simplified finite element analysis method was suggested to predict deformed shape and hardness distribution of locally cold rolled region and achieved similar result between FE analysis result and Quality standard. Suggested method would be very effective method to engine spindle manufacture to predict hardness of different size of product.
5
Content available The modelling of temperature-dependent stress-strain curves for weldable steels
Winczek J., Mičian M., Ivanov V.
Journal of Applied Mathematics and Computational Mechanics
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2018
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Vol. 17, nr 3
111--117
EN
The calculation of stresses in the steel elements subjected to the thermomechanical loads requires taking into account the influence of temperature on mechanical properties of a material, including the stress-strain curve. The simplified and extended computational models of temperature-dependent tensile curves have been discussed. The methodology of the stress-strain curve construction in the entire temperature range of the solid state of the material has been proposed. The considerations are illustrated by the examples of calculated stress-strain curves in different temperatures for S235 and S355 welding steels.
6
Technological properties of materials for tailor welded blanks
Brusilova A., Schrek A., Svec P., Gabrisova Z.
Hutnik, Wiadomości Hutnicze
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2017
|
Vol. 84, nr 8
364--367
EN
The materials determined for production of tailor welded blanks are characterized by different mechanical properties such as strength, plasticity and stiffness or by different thicknesses. These differences of materials are utilized for optimization of final product with desired properties. The deep drawing of tailor welded blanks is characterized by nonuniform material flow, instability and negative movement of the weld line. These effects are caused by different technological properties of constituent blank sheets. In case of another anomaly of these properties fatally defects on drawn parts can be created. Considerable modifications of some technological properties of sheets used in tailor welded blanks were found at solving of problems related to their formability.
PL
Materiały przeznaczone do produkcji wsadów spawanych laserowo charakteryzują się zróznicowaniem właściwości mechanicznych, jak wytrzymałość, plastyczność i sztywność lub geometrii łączonych blach. Zróżnicowanie cech łączonych materiałów wykorzystywane jest do optymalizacji właściwości produktu końcowego. Podczas procesu głębokiego tłoczenia wsadów spawanych laserowo występuje niejednorodne płynięciem kształtowanego wsadu, niestabilność i niekorzystne przemieszczanie się linii spoiny. Te efekty spowodowane są oddziaływaniem zróżnicowanych właściwości technologiczny arkuszy blach składowych. Dodatkowo odchylenia w zakresie właściwości materiałów wsadowych mogą powodować niekorzystne skutki - defekty elementów tłoczonych. W pracy dowiedziono, że istnieje możliwość modyfikacji niektórych właściwości technologicznych arkuszy blach składowych stosowanych do produkcji wsadów spawanych laserowo, co zapewni rozwiązanie problemów ich przetwarzania.
7
Content available remote Model konstytutywny skrępowanego ściskania fibrobetonu
Zaborski A.
Cement Wapno Beton
|
2016
|
R. 21/83, nr 1
46--52
PL
Beton zbrojony włóknami wykazuje szereg korzystnych właściwości mechanicznych. Zarówno jego wytrzymałość jak i odkształcalność znacznie wzrastają, w przypadku stosowania tego kompozytu wraz z dodatkowym, krępującym zbrojeniem obwodowym. W artykule przedstawiono analityczny model uogólnionego związku naprężenie-odkształcenie, opartego na dostępnych w literaturze badaniach doświadczalnych. Zaproponowane równanie pozwala na oszacowanie zależności krzywizny pręta zbrojącego od momentu zginającego, w warunkach skrępowanej pracy elementu betonowego.
EN
Fiber reinforced concrete offers several mechanical benefits. The material strength and deformability are highly increased when the material is used with restricting passive confinement. In this paper, an analytical model for general stress-strain behavior in compression is presented, based on available in literature experimental data. Postulated formula is further used to predict bending moment-curvature relationship for confined fiber reinforced concrete.
8
Content available Metodyka wykreślania krzywej σ = σ (ε) z uwzględnieniem sztywności maszyny wytrzymałościowej
Godzimirski J.
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
|
2014
|
Vol. 5, Nr 4 (18)
59-70
PL
Próba statycznego rozciągania jest podstawową próbą wytrzymałościową stosowaną do określania właściwości mechanicznych materiałów konstrukcyjnych, z których najważniejszymi są: granica plastyczności, wytrzymałość doraźna oraz moduł sprężystości wzdłużnej. Współczesne maszyny wytrzymałościowe umożliwiają określenie wartości granicy plastyczności i wytrzymałości doraźnej z dużą dokładnością. Określenie modułu sprężystości wzdłużnej wymaga zastosowania dodatkowo ekstensometru, ponieważ maszyna wytrzymałościowa mierzy jedynie przemieszczenia ruchomej trawersy, a nie wydłużenie badanego materiału. Przemieszczenia te są sumą odkształceń badanej próbki i odkształceń maszyny wytrzymałościowej. Zaproponowano metodykę uwzględniania sztywności maszyny wytrzymałościowej przy określaniu charakterystyki σ = σ (ε) badanych materiałów. Sztywność maszyny to w przybliżeniu liniowa zależność wydłużenia maszyny od siły. Znając tę zależność, można obliczyć wydłużenie maszyny dla określonej wartości siły. Wydłużenie to należy odjąć od przemieszczenia rejestrowanego przez maszynę, a obliczona różnica będzie wydłużeniem badanej próbki.
EN
The tensile test is a basis to determine strength properties in the constructional materials. The most important strength properties of materials are: yield point, ultimate strength, and Young’s modulus. The contemporary testing machines make possible to carry out the yield point and the ultimate strength with high accuracy of measurement. The determination of Young’s modulus needs to use an extensometer because the testing machine takes the displacement of the testing machine cross-bar but not extension of the tested material. The displacement is the sum of both, tested specimen deformation and testing machine one. The method is proposed to take into consideration the stiffness of the testing machine for determination of stress-strain curves of tested materials. The testing machine stiffness is approximated by a linear force-extension dependence of the machine. Therefore it is possible to calculate the machine extension for definite force. The extension should be taken away of the displacement recoded by testing machine for this force. The calculation result is the extension of a tested sample for definite force. The presented method is especially useful for compression test of short specimens.
9
Content available Determination of constant parameters of copper as power-law hardening material at different test conditions
Kowser M. A., Mahiuddin M.
International Journal of Applied Mechanics and Engineering
|
2014
|
Vol. 19, no. 4
687--698
EN
In this paper a technique has been developed to determine constant parameters of copper as a power-law hardening material by tensile test approach. A work-hardening process is used to describe the increase of the stress level necessary to continue plastic deformation. A computer program is used to show the variation of the stress-strain relation for different values of stress hardening exponent, n and power-law hardening constant, α . Due to its close tolerances, excellent corrosion resistance and high material strength, in this analysis copper (Cu) has been selected as the material. As a power-law hardening material, Cu has been used to compute stress hardening exponent, n and power-law hardening constant, α from tensile test experiment without heat treatment and after heat treatment. A wealth of information about mechanical behavior of a material can be determined by conducting a simple tensile test in which a cylindrical specimen of a uniform cross-section is pulled until it ruptures or fractures into separate pieces. The original cross sectional area and gauge length are measured prior to conducting the test and the applied load and gauge deformation are continuously measured throughout the test. Based on the initial geometry of the sample, the engineering stress-strain behavior (stress-strain curve) can be easily generated from which numerous mechanical properties, such as the yield strength and elastic modulus, can be determined. A universal testing machine is utilized to apply the load in a continuously increasing (ramp) manner according to ASTM specifications. Finally, theoretical results are compared with these obtained from experiments where the nature of curves is found similar to each other. It is observed that there is a significant change of the value of n obtained with and without heat treatment it means the value of n should be determined for the heat treated condition of copper material for their applications in engineering fields.
10
Content available remote Thermo-mechanical treatment of Fe–Mn–(Al, Si) TRIP/TWIP steels
Dobrzański L. A., Borek W.
Archives of Civil and Mechanical Engineering
|
2012
|
Vol. 12, no. 3
299--304
EN
Recent development in group of Fe–Mn–Al–Si steels with high-manganese content demands for more research in thermo-mechanical treatment and development of microstructure in such steels. Hot working conditions on forming the structure and course of the heat activated processes, removing the strain hardening effects, have been investigated. The chemical compositions of two high-manganese austenitic TRIP/TWIP steels containing various Mn concentrations were developed. Additionally, the steels were microalloyed by Nb and Ti in order to control the grain growth under hot-working conditions. The force-energetic parameters of hot-working were determined in continuous and multi-stage compression test performed in temperature range from 850 to 1100 °C and strain rate of 0.1, 1, 10 s−1 using the Gleeble 3800 thermo-mechanical simulator. The microstructure of investigated steels was determined in metallographic investigations using light microscope as well as X-ray diffraction. It was found that the thermo-mechanical treatment conditions have no influence on phase composition of the investigated steels.
11
Content available remote The application of Zurek’s rheological model for description of mechanical behaviour of textiles subjected to different state of loads
Żurek W., Chrzanowski M., Sybilska W., Jałmużna I.
Journal of Achievements in Materials and Manufacturing Engineering
|
2010
|
Vol. 43, nr 2
702--710
EN
Purpose: In order to describe the rheological properties of textile products there have been used various models but none of them delivers the complementary solution for textiles subjected to different fields of loads. Therefore the idea presented by Hasley in 1945 was an inspiration for us to propose the new rheological model based on theory of plastic-elastic solids. Design/methodology/approach: It was assumed that the modified rheological model would consist of two parallel parts: I - Hooke’s spring with rigidity C1 and II - Hooke’s spring with rigidity C2, connected in series with a frictional element with a constant resistance, T and additional force Kε22, and a piston with a weight m displacing in a liquid with a viscosity η, where ε22 is a shift of the piston from its initial position. Findings: The proposed model represents adequately stress – strain relationships of polypropylene monofilaments subjected to tensile test. The results indicate that for each investigated type of nonwovens there is no significant difference between the shape of the theoretical and experimental elastic recovery curve during the recovery test. Research limitations/implications: The application of presented model was used for illustration of the description of relaxation of polypropylene monofilament subjected to tensile load and rheological properties of non-woven fabrics made also from polypropylene fibres subjected to the compression loads. Originality/value: The new rheological model was proposed. It can be universal for description of mechanical behaviour of textiles subjected to the tension or compression loads.
12
Content available remote Modelling the Stress - strain Curve of Textile Products. Part 2, Simulation of Real Stress - strain Curves
Serwatka A., Bruniaux P., Frydrych I.
Fibres & Textiles in Eastern Europe
|
2007
|
Vol. 15, no. 3 (62)
60--62
EN
This paper presents the second part of our study describing the modelling of the yarn stretching phenomena recently published in F&T in EE [1]. The continuation of this app-roach involves the identification of unknown parameters in the model, as well as proper stress-strain curve division, in order to avoid problems of identification. In order to avoid the effects of parametric compensation, which has been very often observed, when the number of model parameters becomes significant we use a new strategy of identification. The division of the model into submodels contributes to the correct operation of the identification, because we use a method which partially identifies with submodels which have a small number of parameters. The parameters of the proposed model were identified using MATLAB software. Various types of yarns were tested according to whether their origin was natural and man-made. Finally, the superposition of the practical and simulated curves was carried out, with the aim of verifying the correctness of the proposed model. The results show that the model was adapted perfectly in almost all types of the yarns used.
PL
Pierwsza część tej pracy [1] dotyczyła omówienia nowego modelu, opracowanego w GEMTEX, Francja, wyróżniającego się podziałem krzywej rozciągania na trzy strefy. Kontynuacja tej pracy obejmuje identyfikację nieznanych parametrów modelu oraz prawidłowego podziału krzywych rozciągania celem uniknięcia problemów z identyfikacją. Dla zapobieżenia powstawaniu efektu kompensacji parametrów, często obserwowanemu jeżeli liczba parametrów modelu jest zmienna, zastosowano nową strukturę identyfikacji. Podział modelu na podmodele przyczynia się do prawidłowego postępowania przy identyfikacji, gdyż identyfikuje się modele o prostszej strukturze i mniejszej liczbie parametrów. Identyfikację przeprowadzono za pomocą programu komputerowego MATLAB. Testowano przędze wytworzone z włókien o różnym pochodzeniu, a co za tym idzie różnej charakterystyce. Jako surowce wykorzystano włókna pochodzenia naturalnego (bawełnę) oraz włókna chemiczne z polimeru naturalnego (Tencel) i syntetycznego (poliester). Stwierdzono dużą zgodność pomiędzy krzywymi wykonanymi doświadczalnie i za pomocą symulacji.
13
Content available remote Approximate Study on a Tensile Model of Wool/spandex Core - spun Yarn
Dang M., Wang S.
Fibres & Textiles in Eastern Europe
|
2007
|
Vol. 15, no. 4 (63)
59--62
EN
An approximate approach is presented to calculate and predict the specific stress of wool/spandex core-spun yarn, based on an idealised yarn structure model and Hearle’s yarn theory. The approximate model covers some major parameters from wool fiber, spandex and core-spun yarn. Comparing with experimental tensile (stress-strain) curves of core-spun yarn, we can see that the theoretical model can basically reflect the shape of wool/spandex core-spun yarn’s tensile curve and the model is useful for predicting the stress-strain behaviour of wool/spandex core-spun yarn at small extension.
PL
Przedstawiono próbę obliczania i przewidywania wytrzymałości właściwej przędz rdzeniowych wełna-elastomer. Metoda oparta jest na modelu unikalnej struktury włókna i teorii włókna Heorlego. W modelu uwzględniono podstawowe parametry przędzy wełnianej, elastomerowej i połączonej przędzy rdzeniowej. Porównując wyniki obliczeń z krzywymi eksperymentalnymi przędz rdzeniowych, widzimy że model teoretyczny może odzwierciedlać kształt krzywej siła-wydłużenie i musi służyć do przewidywania właściwości wytrzymałościowo-sprężystych przędz rdzeniowych wełna-elastomer przy małych wydłużeniach.
14
Content available remote Effects of hydrogen induced elastic and plastic straining on its transport in Al
Łunarska E., Chernyayeva O.
Advances in Materials Science
|
2007
|
Vol. 7, nr 1(11)
153-159
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 appearance of hydrogen permeation transients and the retardation of hydrogen transport and its accumulation within the plastically deformed metal occur at the low and at the high polarization, respectively. The supersaturation of surface layers with hydrogen or the formation of the patchy hydride like layer have been discussed to be the source of the observed metal straining.
15
Content available remote New Approach to Modeling the Stress - Strain Curve of Linear Textile Products. Part 1, Theoretical Considerations
Serwatka A., Bruniaux P., Frydrych I.
Fibres & Textiles in Eastern Europe
|
2006
|
Vol. 14, no. 1 (55)
30--35
EN
The first part of this paper presents a modelling of the stretching phenomena of linear textile products, specifically yarns. The stretching phenomena are described by a model of the yarn stress-strain curve which was developed by a team from the GEMTEX laboratory. This analysis of the yarn stress-strain curve is an attempt to interpret this curve in the form of a set of various models. This differentiation is due to the change of the yarn’s state at the time of its stretching. The model differs very clearly from the other models presented in literature. In order to compare our research with that described in literature, the sensitivity of the parameters of various models was studied. Dividing the model into sub-models is crucial, because this enables the identification of vector parameter as a whole, by assembling parameters of sub-models. The second part of this approach to modelling the stress-strain curve is concerned with modelling the stress-strain curves of real natural and synthetic yarns.
PL
Pierwsza część tego opracowania poświęcona jest modelowaniu krzywej naprężenie-odkształcenie dla liniowych produktach włókienniczych. Model, opracowany w GEMTEX (Francja) odróżnia się od dotychczas proponowanych modeli, podziałem krzywej na trzy strefy. W artykule przedstawiono analizę porównawczą proponowanego przez autorów modelu z modelami dotychczasowymi przedstawiając m. in. przebiegi odzwierciedlające charakter i intensywność oddziaływania poszczególnych parametrów równań. Podział modelu na submodele jest istotny, ponieważ pozwala na identyfikację parametrów całego układu poprzez prezentację parametrów submodeli. W części drugiej artykułu omówione będzie modelowanie krzywych naprężenie-odkształcenie dla rzeczywistych liniowych produktów włókienniczych.
16
Content available remote Niektóre aspekty wyznaczania sztywności elastomerów
Nadolny K., Jurkowski B.
Archiwum Technologii Maszyn i Automatyzacji
|
2006
|
Vol. 26, nr 1
201-210
PL
Naprężenia przy wydłużeniach 100%, 200% i 300%, zwane modułami, są powszechnie stosowane do oceny sztywności elastomerów. Pokazano, że sztywność gumy zależna jest w dużym stopniu od wydłużenia, niezależnie od użytej metody jej wyznaczenia. Sztywność początkowa jest największa, po czyrn ze wzrostem wydłużenia stopniowo zmniejsza się, dochodząc do minimum (punkt przegięcia) i znów zaczyna rosnąć. Z powodu nieliniowej zależności moduły standardowe nie charakteryzują sztywności elastomeru w warunkach pracy większości wyrobów (wydłużenia 5-10%). Dlatego zaproponowano dwa sposoby obliczenia modułu stycznego za pomocą różniczkowania krzywej rozciągania. Algorytm postępowania zostaf zaprogramowany. Uwzględniono w nim automatyczną poprawę początku krzywej, wygładzanie przez usunięcie powtarzających się wartości oraz zmianę liczby punktów doświadczalnych branych do obliczeń.
EN
Stresses at 100%, 200%, and 300% eiongation are usually used to evaluate the elastic modulus of elastomers. It was shown that modulus of rubber to a high degree depends on elongation, independently on the method used for its evaluation. The initial modulus is the highest; next, is lower till minimal value reaches the knee point of the stress-strain curve, and starts to increase as strain increases. Due to nonlinear dependence of the curve, standard moduli do not characterize stiffness at usage conditions of most of rubber goods (strain 5-10%). Because of this, there were proposed two methods for calculation of tangent modulus by differentiation of the strain-stress curve. The elaborated software was based on the algorithm of actions needed to be performed. There a correction of the beginning of the stress-strain curve was taken into account. In addition, the curve was smoothens by extraction of the replicated values and changes in a number of experimental points taken for calculation.
17
The influence of heat treatment on the mechanical properties of laser welded Al-Li-Cu-Zr alloy.
Twardowska A., Kusiński J.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 4
1254-1257
EN
The effect of heat treatment on the properties of CO2 laser welded Al-2.45%Li-0.02%Cu-0.11%Zr (in wt. %) alloys is presented. This examination was an attempt to archive strength levels comparable to unwelded base alloy. Thermal treatment consisting of solutionizing at 550 degrees centigrade for 2 h and ageing at 175 degrees centigrade for 4 and 8th after welding was necessary to archive adequate labels of the 0.2% proof stress, the yield strength and elongation.
18
Finite element analysis of effect of particle alignment on deformation behaviour of metal matrix composite.
Yilmaz S., Aran A.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 4
691-694
EN
The goal of this work is to determine the role of the particulate alignment on the overall elastic-plastic behaviour of metal matrix composites. Composite was assumed to be 3D infinite periodic array of particulate embedded in the matrix. Particulate were modeled as spherical. Models with transversely aligned and staggered particle distributions were used. The effect of particle alignment on the overall stress-strain behaviours of the composites are followed through unit cells having different aspect ratios. The difference in the stress-strain behaviour of models shows clearly that the ratio of the particle diameter to the distance between nearest neighbour particles can represent the effect of distribution geometry.
19
A study of the residual stresses and their potential effect on yielding of the austenitic stainless steel.
Mizera J., Fillit R., Stolarz J., Kurzydłowski K.J.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 5
1316-1317
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