Soyarslan, Celal
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Soyarslan, C.
Soyarslan, Celal
C., Soyarslan
Celal, Soyarslan
C.,Soyarslan
S., Celal
S.,Celal
Soyarslan,C.
Soyarslan, Celal
C., Soyarslan
Celal, Soyarslan
C.,Soyarslan
S., Celal
S.,Celal
Soyarslan,C.
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Scholarly Output
7
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6
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81
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1
7 results
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Now showing 1 - 7 of 7
Master Thesis Yumuşamalı plastisite için viskoz ve yerel olmayan entegral tip regülarizasyon yöntemleri: (Infinitesimal genlemeli çatı)(2009) Kayhan, Erdem; Soyarslan, Celal; Soyarslan, Celal; Airframe and Powerplant Maintenance; Department of Mechatronics EngineeringGenlemeli yumuşama davranışını gösteren malzemeler için, klasik yerel süreklilik modellemesinin kullanıldığı sonlu elemanlar metodu, örgüye bağlı sonuçlar vermeye yatkındır. Malzeme temel modelinin kurulumu, termodinamik yaklaşımla iç değişkenlere bağlı olarak gerçekleştirilmiştir, bu çalışma, lokalizasyonu sınırlandıran, uygun örgü boyutunun kullanılmasına ve bir tek sonucun elde edileceği çözüme odaklıdır.Bu çerçevede, yerel olmayan entegral tip ortalama ve viskoz regülarizasyon yöntemleri geliştirilmiştir. Yumuşamalı malzeme davranışı, infinitesimal genlemeli çatı için plastisite teorisinin uyarlanması ile açıklanmıştır. Yerel entegrasyonun sayısal hesaplamasında, kapalı Euler geri yerine koyma tekniği temel alınmıştır. Bu yöntemde en yakın noktaya yansıtma esas alınır. Buraya kadar geliştirilmiş olan çözüm yöntemleri, ABAQUS için kullanıcı tanımlı malzeme arayüz yazılımına dönüştürülmüştür. Yazılımın doğrulanmasından sonra, iki boyutlu bir örnek kullanılarak, yerel olmayan ortalama yönteminin başarısı, yerel yaklaşımlardan elde edilen sonuçlar ile karşılaştırılarak gösterilmiştir. Her iki yöntemden elde edilen sonuçlar karşılaştırılarak, detaylı olarak değerlendirilmiştir..Article Citation Count: 0Elastostatics of star-polygon tile-based architectured planar lattices(Elsevier Sci Ltd, 2023) Argeşo, Ahmet Hakan; Gleadall, Andrew; Soyarslan, Celal; Argeso, Hakan; Sozumert, Emrah; Manufacturing Engineering; Department of Mechatronics EngineeringA panoptic view of architectured planar lattices based on star-polygon tilings was developed. Four starpolygon-based lattice sub-families, formed of systematically arranged triangles, squares, or hexagons, were investigated numerically and experimentally. Finite-element-based homogenization allowed computation of Poisson's ratio, elastic modulus, shear modulus, and planar bulk modulus. A comprehensive understanding of the range of properties and micromechanical deformation mechanisms was developed. Adjusting the star-polygon angle achieved an over 250-fold range in elastic modulus, over a 10-fold range in density, and a range of -0.919 to +0.988 for Poisson's ratio. Additively manufactured lattices, achieved by novel printing strategies, showed good agreement in properties. Parametric additive manufacturing procedures for all lattices are available on www.fullcontrol.xyz/#/models/1d3528. Three of the four sub-families exhibited in-plane elastic isotropy. One showed high stiffness with auxeticity at low density and a primarily axial deformation mode as opposed to bending deformation for the other three lattices. The range of achievable properties, demonstrated with property maps, proves the extension of the conventional material-property space. Lattice metamaterials with Triangle-Triangle, Kagome, Hexagonal, Square, Truncated Archimedean, Triangular, and Truncated Hexagonal topologies have been studied in the literature individually. Here, it is shown that these structures belong to the presented overarching lattice family. (c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Article Citation Count: 13Skeletonization-based beam finite element models for stochastic bicontinuous materials: Application to simulations of nanoporous gold(Cambridge Univ Press, 2018) Argeşo, Ahmet Hakan; Argeso, Hakan; Soyarslan, Celal; Manufacturing Engineering; Department of Mechatronics EngineeringAn efficient representative volume element generation strategy is developed in modeling nanoporous materials. It uses periodic 3D beam finite element (FE) models derived from skeletonization of spinodal-like stochastic microstructures produced by a leveled random field. To mimic stiffening with agglomeration of the mass at junctions, an increased Young's modulus is assigned to the elements within the junction zone. The effective Young's modulus, Poisson's ratio, and universal anisotropy index are computed. A good agreement of the Young's modulus predictions with those obtained from experimental results for phase volume fractions 0.20 < phi(B) < 0.50 is observed. Moreover, the elastic anisotropy index of the generated beam networks shows sufficient proximity to isotropy. Finally, it is demonstrated that, as compared to the simulation statistics of voxel-FE models, for the beam-FE models over 500-fold computational acceleration with 250-fold less memory requirement is provided.Article Citation Count: 14Finite deformation plasticity coupled with isotropic damage: Formulation in principal axes and applications(Elsevier Science Bv, 2010) Soyarslan, Celal; Tekkaya, Ahmet Eeman; Manufacturing Engineering; Department of Mechatronics EngineeringA local, isotropic damage coupled hyperelastic-plastic framework is formulated in principal axes. It is shown that, in a functional setting, treatment of many damage growth models, including those originated from phenomenological models (with formal thermodynamical derivations), micromechanics or fracture criteria, proposed in the literature, is possible. As a model problem, a Lemaitre-variant damage model with quasi-unilateral damage evolutionary forms is given with special emphasis on the feasibility of formulations in principal axes. To this end, closed form expression for the inelastic tangent moduli, consistent with the linearization of the closest point projection algorithm, is derived. It is shown that, generally, even in the absence of quasi-unilateral damage evolutionary conditions, the consistent tangent moduli are unsymmetric. The model is implemented as a user defined material subroutine (UMAT) for ABAQUS/Standard. The predictive capability of the selected model problem is studied through axi-symmetric application problems involving forward extrusion of a cylindrical billet, upsetting of a tapered specimen and tension of a notched specimen, in which characteristic failure mechanisms are observed. (C) 2010 Elsevier B.V. All rights reserved.Article Citation Count: 38Application of Continuum Damage Mechanics in discontinuous crack formation: Forward extrusion chevron(Wiley-v C H verlag Gmbh, 2008) Soyarslan, Celal; Tekkaya, A. Erman; Tekkaya, Ahmet Eeman; Department of Mechatronics Engineering; Manufacturing EngineeringMaterializing Continuum Damage Mechanics (CDM), numerical modeling of discrete internal cracks, namely central bursts, in direct forward extrusion process is presented. Accordingly, in a thermodynamically consistent setting, a local Lemaitre variant damage model with quasi-unilateral evolution is coupled with hyperelastic-plasticity. The formulations are constructed in the principal axes where simultaneous local integration schemes are efficiently developed. To this end, the framework is implemented as ABAQUS/VUMAT subroutine to be used in an explicit FE solution scheme, and utilized in direct forward extrusion simulations for bearing steel, 100Cr6. Discontinuous cracks are obtained with the element deletion procedure, where the elements reaching the critical damage value are removed from the mesh. The periodicity of the cracks shows well accordance with the experimental facts. The investigations reveal that, application of the quasi-unilateral conditions together with the crack closure parameter has an indispensable effect on the damage accumulation zones by determining their internal or superficial character. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Article Citation Count: 15Prevention of Internal Cracks in Forward Extrusion by Means of Counter Pressure: A Numerical Treatise(verlag Stahleisen Mbh, 2009) Soyarslan, Celal; Tekkaya, Ahmet Eeman; Manufacturing Engineering; Department of Mechatronics EngineeringIn the context of forward bulk extrusion, where product defects are frequently observed, the effect of counter pressure on damage accumulation materializing a Continuum Damage Mechanics (CDM) approach is presented. A Lemaitre variant damage model accounting for unilateral damage evolution coupled with a multiplicative finite plasticity is utilized for this purpose. After a presentation of the crack governing mechanism, it is demonstrated that application of counter pressure introduces a marked decrease in the central damage accumulation, which in turn increases the formability of the material through keeping the tensile triaxiality in tolerable limits. It is also shown that, for a crack involving process, through systematic increase of the counter pressure, the crack sizes diminish; and at a certain level of counter pressure chevron cracks can be completely avoided.Article Citation Count: 1Finite element analysis of stress distribution on modified retentive tips of bar clasp(Taylor & Francis Ltd, 2012) Soyarslan, Celal; Demirci, Emrah; Can, G.; Demirci, E.; Department of Mechatronics EngineeringThis study used finite element analysis to evaluate the retentive tips of bar clasps made from different alloys and using different designs in order to determine whether or not different materials and tip forms are suitable for bar clasp applications. Co-Cr, Ti and Type IV Au alloys were selected based on their physical and mechanical properties. The 3D finite element models of three different bar clasp retentive tip geometries prepared from Co-Cr, Ti and Type IV Au alloys were constructed using the finite element software package MSC. Marc. Analysis of a concentrated load of 5N applied to the removable partial denture approach arms in an occlusal direction was performed. Although stress distribution and localisation within bar clasps with different retentive tips were observed to be similar and were concentrated in the approach arm, stress intensities differed in all models.
