Browsing by Keywords "Homogenization"
Now showing items 1-20 of 20
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Aspects of computational homogenization in magneto-mechanics: Boundary conditions, RVE size and microstructure composition
(Elsevier, 2018-01)In the present work, the behavior of heterogeneous magnetorheological composites subjected to large deformations and external magnetic fields is studied. Computational homogenization is used to derive the macroscopic ... -
A computational homogenization framework for soft elastohydrodynamic lubrication
(Springer, 2012)The interaction between microscopically rough surfaces and hydrodynamic thin film lubrication is investigated under the assumption of finite deformations. Within a coupled micro-macro analysis setting, the influence of ... -
Determining the effective constitutive parameters of finite periodic structures: Photonic crystals and metamaterials
(Institute of Electrical and Electronics Engineers, 2008)A novel approach to find the effective electric and magnetic parameters of finite periodic structures is proposed. The method uses the reflection coefficients at the interface between a homogenous half-space and the periodic ... -
Homogenization accounting for size effects in particulate composites due to general interfaces
(Elsevier, 2019)Two analytical approaches are developed to determine the overall size-dependent response of composites embedding general interfaces. The first approach extends the composite sphere assemblage (CSA) approach and the generalized ... -
Homogenization of composites embedding general imperfect interfaces
(Bilkent University, 2019-06)The objective of this work is to present a systematic study on the overall behavior of composites embedding general interfaces between the constituents. The zero-thickness interface model represents a finite-thickness ... -
Homogenization of soft interfaces in time-dependent hydrodynamic lubrication
(Springer Verlag, 2015)The difficulty behind the unsteady lubrication problem is the oscillation of the film thickness in both position and time. The present study aims to extend the multiscale analysis of lubricated interfaces to the unsteady ... -
Homogenization-based design of surface textures in hydrodynamic lubrication
(John Wiley and Sons Ltd, 2016)An optimization framework is developed for surface texture design in hydrodynamic lubrication. The microscopic model of the lubrication interface is based on the Reynolds equation, and the macroscopic response is characterized ... -
Homogenization-based microscopic texture design and optimization in hydrodynamic lubrication
(Bilkent University, 2016-08)The aim of this thesis is to develop an optimization framework for the texture optimization in hydrodynamic lubrication using multi-scale homogenization technique. In hydrodynamic lubrication the asperities do not come ... -
Isogeometric analysis for numerical plate testing of dry woven fabrics involving frictional contact at meso-scale
(Springer, 2019-01)With a view to application to meso–macro decoupled two-scale draping simulations of dry woven fabrics, the method of isogeometric analysis (IGA) is applied to the numerical plate testing (NPT) for their periodic unit ... -
A method of two-scale chemo-thermal-mechanical coupling for concrete
(CIMNE, 2011)The Alkali Silica Reaction(ASR) is one of the most important reasons to cause damage in cementitious constructions, which can be attributed to the expansion of hydrophilic gel produced in the reaction. In this contribution, ... -
Micro-texture design and optimization in hydrodynamic lubrication via two-scale analysis
(Springer Verlag, 2017)A novel computational surface engineering framework is developed to design micro-textures which can optimize the macroscopic response of hydrodynamically lubricated interfaces. All macroscopic objectives are formulated and ... -
Microscopic design and optimization of hydrodynamically lubricated dissipative interfaces
(John Wiley & Sons, Ltd., 2019)A homogenization‐based topology optimization framework is developed, which can endow hydrodynamically lubricated interfaces with a micro‐texture, to achieve optimal macroscopic responses by addressing both dissipative and ... -
Modeling of thermal sensitivity of a fiber optic gyroscope coil with practical quadrupole winding
(SPIE, 2017)Thermally induced bias error is one of the main performance limits for the fiber optic gyroscopes (FOGs). We reviewed the thermal sensitivity of FOG in detail and created a simulation environment by the Finite Element ... -
Multiscale hydro-thermo-chemo-mechanical coupling: application to alkali-silica reaction
(Elsevier, 2014)Alkali-Silica Reaction (ASR) is a complex chemical process that affects concrete structures and so far various mechanisms to account for the reaction at the material level have already been proposed. The present work adopts ... -
On the asymptotic expansion treatment of two-scale finite thermoelasticity
(Elsevier, 2012-04)The asymptotic expansion treatment of the homogenization problem for nonlinear purely mechanical or thermal problems exists, together with the treatment of the coupled problem in the linearized setting. In this contribution, ... -
Subverting the secular-religious dichotomy: religious exclusion and nation-building in Turkey and Pakistan
(Bilkent University, 2015)This study investigates the role of religion in nation building processes of Turkey and Pakistan. Current literature on these two countries is divided between those who claim that Islam was an essential arm of nation-building ... -
Systematic study of homogenization and the utility of circular simplified representative volume element
(Sage Publications, 2019-01)Although both computational and analytical homogenization are well-established today, a thorough and systematic study to compare them is missing in the literature. This manuscript aims to provide an exhaustive comparison ... -
Thermally induced bias errors for a fiber coil with practical quadrupole winding
(Institute of Electrical and Electronics Engineers Inc., 2017)This paper presents an advanced thermal modeling of a fiber optic gyroscope (FOG) coil. We extended the current models to practical quadrupole winding. Model covers homogenization/dehomogenization parameters of fiber coil. ... -
Understanding the role of general interfaces in the overall behavior of composites and size effects
(Elsevier, 2019)The objective of this contribution is to investigate the role of generalized interfaces in the overall response ofparticulate composites and the associated size effects. Throughout this work, the effective properties of ... -
Wave propagation in metamaterial structures and retrieval of homogenization parameters
(Bilkent University, 2007)Electromagnetic wave propagation in metamaterial structures (metamaterial slabs, metamaterial cylinders, metamaterial coated conducting cylinders etc.) are investigated. Scattered and transmitted electromagnetic fields ...
