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Tytuł:
Research on Forming Parameters Optimization of Incremental Sheet Forming Processf or Commercially Pure Titanium Grade 2 Sheets
Autorzy:
Szpunar, Marcin
Trzepieciński, Tomasz
Ostrowski, Robert
Zwolak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2174594.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
incremental sheet forming
forces
fracture
parameter optimization
titanium
Opis:
This study aims to determine optimal forming parameters for Incremental Sheet Forming process Commercially Pure titanium Grade 2 sheets in terms of formability improvement, force reduction, and efficiency of forming. Based on the central composite design, data were collected during 20 runs and then variation analysis was performed. The experiments were performed on a 3 axis CNC milling machine equipped with a Kistler dynamometer plate. Subsequently, regression models have been developed to describe process responses by input factors. As crucial parameters, the relative velocity and step size of the tool that affect the forming force and the height of the fracture have been determined. Finally, the application of optimization algorithm has emerged optimal input factors in terms of selected multi-criteria goal. The results of this study suggest that there is a process window that allows the formation of 45° wall angle drawpieces of commercially pure titanium Grade 2.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1411--1418
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economical optimization of the mechanized longwall faces with top coal caving mining, in horizontal slices
Optymalizacja kosztów wydobycia ścianowego z prowadzeniem stropu na zawał, przy wybieraniu warstwami poziomymi
Autorzy:
Onica, I.
Mihailescu, V.
Andrioni, F.
Powiązania:
https://bibliotekanauki.pl/articles/964011.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wybierania na zawał
długość pola wybierania
wybierania warstwami poziomymi
parametry optymalizacji
koszt wydobycia
wysokość węgla stropowego
top coal caving mining
horizontal slice
parameters optimization
production cost
top coal height
panel length
Opis:
To increase the economic and technical performances of the Jiu Valley hard coal mines, the top coal caving, in horizontal slices, mining methods (Bourbaki methods) were introduced, adapted to the local geo-mining conditions. This mining was successfully experimented by using classical technology, using the individual supports and coal blasting. In the future, it is planned to adopt the mechanized technology, with frame supports and shearers. The mechanized longwall faces with top coal caving mining, in horizontal slices, of coal seam no. 3 could be efficient only if the sizes of the top coal height and the panel length determine a minimum cost of production. Therefore, the goal of this paper is the optimization of these parameters, from a technical and economic point of view, taking into account the general model of the cost function, at the panel level. For that, it was necessary to make a certain sequence of analysis involving: technological unit establishment, purpose function and optimizing model. Thus, there attaining to the mathematical model of the unit cost, after determination of all the individual calculation articles, regarding the preparatory workings, coal face equipments, materials, energy, workforce, etc. Because of the complexity of the obtained technical and economic model, to determine the optimum sizes of the panel length and top coal height, it was necessary to archive a sensitivity analysis of the unit cost function to the main parameters implied into this mathematical model.
W celu podniesienia wydajności i opłacalności wydobycia, w kopalniach węgla kamiennego w Dolinie Jiu wprowadzono metodę wybierania warstwami poziomymi, z prowadzeniem stropu na zawał (metoda Bourbaki), przystosowaną do panujących w terenie warunków geologicznych i górniczych. Wydobycie prowadzono z powodzeniem przy użyciu tradycyjnych technologii: prac strzałowych i systemu podpór. W przyszłości planuje się zastosowanie wybierania zmechanizowanego, z wykorzystaniem systemu obudów oraz wrębiarek. Wybieranie ścianowe warstwami poziomymi w prowadzeniem stropu na zawał w przypadku pokładu nr 3 będzie efektywne jedynie wtedy, gdy odpowiednio dobrane zostaną wysokość węgla stropowego i długość pola wybierania, tak by zapewnić minimalne koszty wydobycia. Celem niniejszego opracowania jest optymalizacja tych parametrów, z uwzględnieniem aspektów technicznych i ekonomicznych, z wykorzystaniem ogólnego modelu funkcji kosztu dla danego poziomu pola wybierania. W tym celu przeprowadzono wieloetapową analizę, obejmującą określenie parametrów jednostkowych, funkcji celu oraz modelu optymalizacyjnego. Matematyczny model funkcji kosztu opracowano po uwzględnieniu niezbędnych do procedury obliczeniowej aspektów: prac przygotowawczych, analizy sprzętu używanego w rejonie przodka, materiały, energii, siły roboczej. Z uwagi na złożoność otrzymanego modelu technologicznego i ekonomicznego, aby obliczyć optymalny wymiar pola wybierania i wysokość węgla stropowego, niezbędne było przeprowadzenie analizy wrażliwości funkcji kosztu jednostkowego na zmiany podstawowych parametrów modelu.
Źródło:
Archives of Mining Sciences; 2016, 61, 3; 651-676
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of geometric parameters of a ribbon impeller
Autorzy:
Kuncewicz, C.
Stelmach, J.
Powiązania:
https://bibliotekanauki.pl/articles/185034.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixing
laminar motion
ribbon impellers
optimization
ruch laminarny
wirnik taśmowy
optymalizacja
Opis:
Geometric parameters of a ribbon impeller were optimized on the basis of numerical calculations obtained from the solution of our own 3D/2D hybrid model. The optimization was made taking into account mixing power and homogenization time for ribbon impellers with a different number of ribbons and width operating in a laminar motion for Newtonian fluid. Due to minimum mixing energy required to stir a unit volume of liquid the most efficient impeller appeared to be that with one ribbon of width equal to 0.1 to 0.15 of the mixing vessel diameter. Impellers with more than one ribbon needed much higher mixing power but did not increase significantly secondary circulation in the vessel. These impellers increased first of all primary circulation, i.e. they increased only circular motion of liquid in the vessel.
Źródło:
Chemical and Process Engineering; 2017, 38, 3; 491-502
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Optimization Parameters on the Efficiency of Aluminium Melt Refining by using Physical Modelling
Autorzy:
Walek, Josef
Michalek, Karel
Tkadlečková, Markéta
Powiązania:
https://bibliotekanauki.pl/articles/2174623.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
physical modelling
refining ladle
blowing of inert gas
degassing of the melt
impeller
modelowanie fizyczne
kadź rafinacyjna
wdmuchiwanie gazu obojętnego
odgazowanie stopu
wirnik
Opis:
The article describes the influence of optimization parameters on the efficiency of aluminium melt refining by using physical modelling. The blowing of refining gas, through a rotating impeller into the ladle is a widely used operating technology to reduce the content of impurities in molten aluminium, e.g. hydrogen. The efficiency of this refining process depends on the creation of fine bubbles with a high interphase surface, wide-spread distribution, the residence time of its effect in the melt, and mostly on the wide-spread dispersion of bubbles in the whole volume of the refining ladle and with the long period of their effect in the melt. For physical modelling, a plexiglass model on a scale of 1:1 is used for the operating ladle. Part of the physical model is a hollow shaft used for gas supply equipped with an impeller and also two baffles. The basis of physical modelling consists in the targeted utilization of the similarities of the processes that take place within the actual device and its model. The degassing process of aluminium melt by blowing inert gas is simulated in physical modelling by a decrease of dissolved oxygen in the model liquid (water).
Źródło:
Archives of Foundry Engineering; 2022, 22, 3; 60--66
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taguchi Approach for Optimization of Parameters that Reduce Dimensional Variation in Investment Casting
Autorzy:
Bansode, S. N.
Phalle, V. M.
Mantha, S.
Powiązania:
https://bibliotekanauki.pl/articles/381195.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
innovative foundry material
investment casting
dimensional accuracy
Taguchi method
optimisation
innowacyjna technologia odlewnicza
innowacyjny materiał odlewniczy
odlewnictwo
dokładność wymiarowa
metoda Taguchi
optymalizacja
Opis:
Variation in final casting dimensions is a major challenge in the investment casting industry. Additional correction operations such as die tool reworking as well as coining operations affect foundry productivity significantly. In this paper influence of basic parameters such as wax material, mould material, number of ceramic coats and feed location on the dimensional accuracy of stainless-steel casting has been investigated. Two levels of each factor were chosen for experimental study. Taguchi approach has been used to design the experiment and to identify the optimal condition of each parameter for reduced dimensional deviation. Analysis of variance has been carried out to determine the contribution of each process parameter. The result reports that selected parameters have significant effect on the dimensional variability of investment casting. Mould material is the dominant parameter with the largest contribution followed by number of ceramic coats and wax material whereas feed location is having negligible contribution.
Źródło:
Archives of Foundry Engineering; 2019, 1; 5-12
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Parameters for a Damped Oscillator Excited by a Sequence of Random Pulses
Autorzy:
Ozga, A.
Powiązania:
https://bibliotekanauki.pl/articles/177370.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
random pulses
oscillator with damping
vibroacoustics
Opis:
The paper is another step in discussion concerning the method of determining the distributions of pulses forcing vibrations of a system. Solving a stochastic problem for systems subjected to random series of pulses requires determining the distribution for a linear oscillator with damping. The goal of the study is to minimize the error issuing from the finite time interval. The applied model of investigations is supposed to answer the question how to select the parameters of a vibrating system so that the difference between the actual distribution of random pulses and that determined from the waveform is as small as possible.
Źródło:
Archives of Acoustics; 2014, 39, 4; 645-652
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Process Parameters of Ultrasonic Welding on Dissimilar Metal Joints
Autorzy:
Mohan Kumar, Anand
Rajasekar, R.
Karthik, Vaduganathan
Kheawhom, Soorathep
Powiązania:
https://bibliotekanauki.pl/articles/2049410.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
3105-H18 aluminium alloy
pure copper
ultrasonic welding
optimization
micro-hardness
Opis:
Nowadays the automotive industry mostly prefers innovative solid-state welding technologies that would enable to welding of lightweight and high-performance materials. In this work, 3105-H18 Aluminium alloy (Al) and pure Copper (Cu) specimens with 0.5 mm thickness have been ultrasonically welded in a dissimilar (Al-Cu) manner. Optimization of process parameters of ultra-sonic welding has been carried out through full factorial method, three levels of variables considered for this experimental studies namely, weld pressure, amplitude, and time, also each variable interaction with welding strength has been studied. Additionally, micro-hardness and microstructure investigation in welded joints has been studied. The result shows that the weld strength greatly influenced weld amplitude at a medium and higher level of weld pressure. The interface micro-hardness of the welded joint has lower compared to the base metal.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 887-892
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical Approach to Determining Dynamic Recrystallization Parameters Using Finite Element Optimization of Backward Extrusion Process
Autorzy:
Irani, Missam
Joun, Mansoo
Powiązania:
https://bibliotekanauki.pl/articles/352583.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamic recrystallization
grain size
optimization
simulation
Opis:
In this study, we present a new method for obtaining the parameters of the Johnson-Mehl-Avrami-Kolmogorov equation for dynamic recrystallization grain size. The method consists of finite-element analysis and optimization techniques. An optimization tool iteratively minimizes the error between experimental values and corresponding finite-element solutions. Isothermal backward extrusion of the AA6060 aluminum alloy was used to acquire the main parameters of the equation for predicting DRX grain size. We compared grain sizes predicted using optimized and reference parameters with experimental values from the literature and found better agreement when the optimized parameters were applied.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1175-1182
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of squeeze parameters and modification of AlSi7Mg alloy
Autorzy:
Zyska, A.
Konopka, Z.
Łągiewka, M.
Nadolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/381007.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical properties
Al alloy
squeeze casting technology
modification
właściwości mechaniczne
stop Al
technologia prasowania
modyfikacja
Opis:
The paper present the examination results concerning mechanical properties of castings made of AlSi7MG alloy in correlation both with the most significant squeeze casting parameters and with the modification treatment. Experiments were planned and held according to the 23 factorial design. The regression equations describing the influence of the squeeze pressure, the mould temperature, and the quantity of strontium modifier on the strength and elongation of the examined alloy were obtained. It was found that the main factor controlling the strength increase is the squeeze pressure, while the plasticity (A5) of the alloy is affected most advantageously by modification. The application of modification treatment in squeeze casting technology enables for production of the slab-type castings made of AlSi7Mg alloy exhibiting strength at the level of 230 MPa and elongation exceeding 14%.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2; 113-116
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taguchi Approach for Optimization of Parameters that Effect Grain Size of Cast A357 Alloy
Autorzy:
Çolak, M.
Dışpınar, D.
Powiązania:
https://bibliotekanauki.pl/articles/379886.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
A357 alloy
grain refinement
alloy modification
Taguchi approach
stop A357
rafinowanie ziarna
modyfikacja stopu
metoda Taguchi
Opis:
Grain refining and modification are common foundry practice for improving properties of cast Al-Si alloys. In general, these types of treatments provide better fluidity, decreased porosity, higher yield strength and ductility. However, in practice, there are still some discrepancies on the reproducibility of the results from grain refining and effect of the refiner’s additions. Several factors include the fading effect of grain refinement and modifiers, inhomogeneous dendritic structure and non-uniform eutectic modification. In this study, standard ALCAN test was used by considering Taguchi’s experimental design techniques to evaluate grain refinement and modification efficiency. The effects of five casting parameters on the grain size have been investigated for A357 casting alloy. The results showed that the addition of the grain refiner was the most effective factor on the grain size. It was found that holding time, casting temperature, alloy type and modification with Sr were less effective over grain refinement.
Źródło:
Archives of Foundry Engineering; 2017, 17, 4; 35-42
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of cutting parameters in pocket milling of tempered and cryogenically treated 5754 aluminum alloy
Autorzy:
Samtas, G.
Korucu, S.
Powiązania:
https://bibliotekanauki.pl/articles/200335.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloys
cryogenic treatment
surface roughness
Taguchi technique
optimization
Opis:
Aluminum alloys are widely used today in plastic injection molds in the automotive and aerospace industries due to their high strength and weight ratio, good corrosion and fatigue resistance as well as high feed rates. The 5754 aluminum alloy has high corrosion resistance and a structure suitable for cold forming. In this study, an AA 5754-H111 tempered aluminum alloy with the dimensions of 80£80£30 mm was used, and some of the materials were cryogenically heat treated. For the milling operations, φ12 mm diameter 76 mm height uncoated as well as TiCN and TiAlN coated end mills were used. Different levels of cutting depth (1.25, 2.0, 2.5 mm), cutting speed (50, 80, 100 m/ min), feed rate (265, 425, 530 m/ min) and machining pattern (concentric, back and forth and inward helical) were used. The number of experiments was reduced from 486 to 54 using the Taguchi L54 orthogonal array. The values obtained at the end of the experiments were evaluated using the signal-to-noise ratio, ANOVA, three-dimensional graphs and the regression method. Based on the result of the verification experiments, the processing accuracy for surface roughness was improved from 3.20 μm to 0.90 μm, with performance increase of 71.88%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 697-707
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Process Parameters During End Milling and Prediction of Work Piece Temperature Rise
Autorzy:
Bhirud, N. L.
Gawande, R. R.
Powiązania:
https://bibliotekanauki.pl/articles/140078.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dry milling
end milling
Al 6063
Taguchi method
variance analysis ANOVA
regression analysis
frezowanie na sucho
frezowanie wykończeniowe
metoda Taguchiego
analiza wariancji (ANOVA)
analiza regresji
Opis:
During the machining processes, heat gets generated as a result of plastic deformation of metal and friction along the tool–chip and tool–work piece interface. In materials having high thermal conductivity, like aluminium alloys, large amount of this heat is absorbed by the work piece. This results in the rise in the temperature of the work piece, which may lead to dimensional inaccuracies, surface damage and deformation. So, it is needed to control rise in the temperature of the work piece. This paper focuses on the measurement, analysis and prediction of work piece temperature rise during the dry end milling operation of Al 6063. The control factors used for experimentation were number of flutes, spindle speed, depth of cut and feed rate. The Taguchi method was employed for the planning of experimentation and L18 orthogonal array was selected. The temperature rise of the work piece was measured with the help of K-type thermocouple embedded in the work piece. Signal to noise (S/N) ratio analysis was carried out using the lower-the-better quality characteristics. Depth of cut was identified as the most significant factor affecting the work piece temperature rise, followed by spindle speed. Analysis of variance (ANOVA) was employed to find out the significant parameters affecting the work piece temperature rise. ANOVA results were found to be in line with the S/N ratio analysis. Regression analysis was used for developing empirical equation of temperature rise. The temperature rise of the work piece was calculated using the regression equation and was found to be in good agreement with the measured values. Finally, confirmation tests were carried out to verify the results obtained. From the confirmation test it was found that the Taguchi method is an effective method to determine optimised parameters for minimization of work piece temperature.
Źródło:
Archive of Mechanical Engineering; 2017, LXIV, 3; 327-346
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of grippers for laparoscopic surgery and optimization of experimental parameters for maximum tissue weight holding capacity
Autorzy:
Erturk, S.
Samtas, G.
Powiązania:
https://bibliotekanauki.pl/articles/202210.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Laparoscopic gripper
noncontact gripper
tissue type
Taguchi method
optimization
Opis:
Grippers are routinely used to hold, lift and move organs in laparoscopic operations. They are generally toothed to prevent organs from slipping during retention. Organs held by grippers are always at risk of being damaged by the clamping force. In this study, noncontact grippers working with the Bernoulli principle and using air pressure were developed, and vacuum performance was compared in terms of maximum tissue weight holding capacity. For this purpose, Taguchi method was employed for experimental design and optimization, and Taguchi L16 orthogonal array was selected for experimental design. The experimental parameters were 4 gripper types, 4 air-pressure levels (3.5, 4.5, 5, and 5.5 bar), 4 flow rates (2.2, 2.6, 2.8 and 3 m3/h) and two animal tissue types (ventriculus/gizzard and skin). Values from the experimental procedures were evaluated using signal-to-noise ratio, analysis of variance and three-dimension graphs. An equation was obtained by using 3rd-order polynomial regression model for weight values. Optimization reliability was tested by validation tests and the revealed test results were within the estimated confidence interval. The results obtained from this study are important for future studies in terms of organ injury prevention due to traditional grippers in laparoscopic surgery.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1125-1132
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of process parameters of friction stir welded AA 5083-O aluminum alloy using Response Surface Methodology
Autorzy:
Jannet, S.
Mathews, P. K.
Raja, R.
Powiązania:
https://bibliotekanauki.pl/articles/202208.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir welding
optimization
Response Surface Analysis
Analysis of Variance
tensile strength
spawanie
tarcie
optymalizacja
RSA
wytrzymałość na rozciąganie
Opis:
A methodology was exhibited to create the experimental model for assessing the Ultimate Tensile Strength of AA 5083-O aluminum compound which is broadly utilized as a part of boat building industry by Friction Stir Welding (FSW). FSW process parameters, such as: tool rotational speed, welding speed, and axial force were optimized for better results. FSW was completed considering three-component 3-level Box Behnekn Design. Response surface Methodology (RSM) was implemented to obtain the relationship between the FSW process parameters and ultimate Tensile Strength. Analysis of Variance (ANOVA) procedure was utilized to check the aptness of the created model. The FSW process parameters were additionally streamlined utilizing Response Surface Methodology (RSM) to augment tensile strength. The joint welded at a rotational speed of 1100 rpm, a welding speed of 75 mm/min and a pivotal energy of 2.5 t displays higher tensile strength compared with different joints in comparison with other joints.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 851-855
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of process parameters of friction stir welded AA5082-AA7075 butt joints using resonance fatigue properties
Autorzy:
Kumar, G.
Kumar, R.
Powiązania:
https://bibliotekanauki.pl/articles/200299.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir welding
dissimilar Al welding
resonance fatigue analysis
fracture surface analysis
ANOVA
Opis:
In this work, experiments were carried out to quantify the behaviour of friction stir welded (FSW) AA5082-AA7075 butt joints under tensile loading and completely reversed fatigue loading. Different samples were prepared to identify optimum tool rotational and travel speeds to produce FSW AA5082-AA7075 butt joints with the maximum fatigue life. ANOVA was performed, which confirmed that both tool speed nad tool rotation speed affect the tensile strength of the weld. The samples exhibit a considerable difference in their fatigue life and tensile strenght. This difference can be accounted to the presence of welding defects such as surface defects and porosity. S-N curve plotted for the sample shows a significantly high fatigue life at the lower stress ranges. Fracture surfaces were also analysed under scanning electron microscope (SEM). Study of the fracture surface of the sample that failed under fatigue loading showed that the surface was mainly divided in two zones. The first zone was the area of fatigue crack growth where each stress cycle, slowly and gradually, helped in the growth of crack. The second zone was the region of fast fracture where the crack growth resulted in the failure of the joint instantaneously. The fracture surface study of the sample that failed under tensile loading showed that the mode of failure was ductile in nature.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 99-108
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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