Numerical and Experimental Analysis of a Frictionless Receding Contact between Cylindrical Indenter, Layer and Substrate

Rončević, Branimir; Bakić, Ante; Kodvanj, Janoš

doi:10.21278/tof.40201

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…The characteristic strength and Weibull modulus can be obtained by Weibull distribution graph of Figure 6b and Equation ( 4). [43,44] The characteristic strength corresponds to a survival probability of 37%, and Weibull modulus means distribution of the strength. Because Weibull modulus is obtained by slope of graph in Figure 6b, a lower value means a larger stress distribution.…”

Section: Mechanical Flexibility Of Ut C-si Wafersmentioning

confidence: 99%

Laser‐Assisted Nanotexturing for Flexible Ultrathin Crystalline Si Solar Cells

et al. 2023

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Ultrathin (UT) crystalline Si wafers, which are more flexible than conventional ones, can apply to curved surfaces, enabling a wide range of applications such as building‐integrated photovoltaics, vehicle‐integrated photovoltaics, and wearable devices. Thinner wafers require more effective light trapping; thus, surface texturing in microscale is a common approach to compensate for the reduced thickness by enhancing the light pathlength. Microscale textures, however, deteriorate the mechanical flexibility due to stress concentration in the valley of the microtextures. In this study, a laser‐assisted nanotexturing process is proposed for enhanced flexibility of the UT Si solar cells with a 50 μm thickness while maintaining light‐trapping performances. A nanolens array is used to focus laser onto the Si wafers, inducing the formation of nanoparticle etch masks for nanopyramid texturing in an alkaline solution. The origin of the enhanced flexibility of the nanotextured Si wafers is discussed by a micromechanics simulation study. Herein, nanotexturing technique is applied to UT Si‐based passivated emitter rear cells and the enhanced flexibility of the cells with a 26 mm critical bending radius is demonstrated. Also, it is shown that the nanotextured Si wafer provides a higher efficiency of 18.68%, whereas the microtextured one exhibits 18.10%.

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Section: Mechanical Flexibility Of Ut C-si Wafersmentioning

confidence: 99%

Laser‐Assisted Nanotexturing for Flexible Ultrathin Crystalline Si Solar Cells

et al. 2023

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“…Jedno eksperimentalno merenje omogućava prikupljanje velikog broja podataka koji zamenjuju veliki broj mernih traka, što utiče na smanjenje vremena pripreme eksperimenta, pa samim tim i troškova. Trodimenzionalna DIC metoda ima veliku preciznost (do 1 μm) i može da se koristi za ispitivanje različitih materijala [10][11][12][13][14][15], ispitivanje strukture [16][17][18][19][20][21][22][23], verifikaciju modela [23][24][25][26][27], mehaniku loma [28][29][30] itd. Metoda je takođe pogodna i za analizu nepravilnih geometrija objekata izrađenih od različitih materijala [31].…”

Section: Uvodunclassified

Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation

Pavkov

Bakić

Maksimović

et al. 2020

Hem Ind

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Jedan od važnih zadataka procene integriteta mašinskih elemenata i konstrukcija je određivanje lokalnih mehaničkih svojstava. U ovom radu izvršeno je eksperimentalno i numeričko ispitivanje mehaničkih svojstava cevi, izlaznog međupregrejača pare, izrađenog od toplotnopostojanog čelika 12H1MF, nakon 200.000 h rada. Cev izlaznog međupregrejača pare je isečena iz cevnog sistema tokom remonta termoelektrane, a potom hladno deformisana savijanjem, u cilju dobijanja cevnog luka, za potrebe eksperimenta. Namenski je konstruisan držač za ispitivanje takvog uzorka. Eksperimentalno istraživanje je bazirano na primeni 3D metode korelacije digitalnih slika, dok je metoda konačnih elemenata primenjena u numeričkoj simulaciji. Metoda 3D korelacije digitalnih slika predstavlja optičku i beskontaktnu eksperimentalnu metodu koja omogućava merenje polja pomeranja i deformacija geometrijski kompleksnih struktura. Za eksperimentalnu analizu kao i verifikaciju numeričkog modela korišćen je sistem Aramis, baziran na metodi korelacije digitalnih slika. Na osnovu dobijenih rezultata i uporedne analize eksperimentalnih i numeričkih vrednosti, koje se odnose na fon Mizesove deformacije na temenu cevnog luka, javlja se odstupanje od oko 18 %. Ovo odstupanje nastaje kao rezultat korišćenih metoda koje imaju bitne razlike u njihovim početnim uslovima ispitivanja. Ključne reči: čelik 12H1MF; gasna korozija; korelacija digitalnih slika; metoda konačnih elemenata.

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“…The same assumptions also apply to a regular pin-plate contact problem. The study by the authors in [25] has to a great degree refuted the soundness of these assumptions for the problem of layer indentation with an elastic indenter, where the problem proved to be nonlinear. However, in this case the structural behaviour is shown to be completely analogous to the classical linear case of receding contacts.…”

Section: Influence Of Load Intensity and Bushing Thicknessmentioning

confidence: 99%

Numerical Receding Contact Analysis of a Perfect-Fit Pin and Bushing in a Loaded Plate

Rončević¹,

Bakić

Kodvanj

2018

Teh. vjesn.

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Numerical analysis is carried out for a frictionless receding contact problem of a perfect-fit pin and bushing in a uniaxially loaded plate. The problem is analysed using the finite element method under the assumption of plane strain and linear elasticity. The problem is investigated for the influence of external load and for different geometries. The obtained contact pressures show uncharacteristic behaviour, where higher peak values occur on contact surfaces with larger contact angles. This seemingly contradicts not only the physics of receding contact problems, but also the physical laws of contact problems in general. It is shown that the reason for this unusual behaviour is, in fact, in the physical reduction of the contact area as the radius of curvature decreases. This class of problems shows to be linearly dependent on the intensity of load as regards the contact stresses, and load has no influence on the contact angles.

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Numerical and Experimental Analysis of a Frictionless Receding Contact between Cylindrical Indenter, Layer and Substrate

Cited by 7 publications

References 21 publications

Laser‐Assisted Nanotexturing for Flexible Ultrathin Crystalline Si Solar Cells

Laser‐Assisted Nanotexturing for Flexible Ultrathin Crystalline Si Solar Cells

Experimental and numerical analyses of an U-bend tube made of an output inter-heater tube after exploitation

Numerical Receding Contact Analysis of a Perfect-Fit Pin and Bushing in a Loaded Plate

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