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A non-iterative boundary element formulation for nonlinear viscoelasticity Akay, Ahmet Arda; Gürses, Ercan; Göktepe, Serdar (2024-06-01) In this study, we propose a non-iterative boundary element method (BEM) of highly nonlinear viscoelasticity in time domain. The computationally attractive iteration-free algorithmic structure is achieved by the linearizati...
Investigation of failure mechanisms in dual-phase steels through cohesive zone modeling and crystal plasticity frameworks Aydiner, Ilbilge Umay; Tatlı, Berkehan; Yalçinkaya, Tuncay (2024-03-01) Dual-phase (DP) steels are characterized by their good formability and interesting material properties, which primarily originate from their unique composition, combining the ductile ferrite phase with the hard martensite ...
Comparison of Linear and Nonlinear Twist Extrusion Processes with Crystal Plasticity Finite Element Analysis Şimşek, Ülke; Davut, Kemal; Miyamoto, Hiroyuki; Yalçınkaya, Tuncay (2024-03-01) The mechanical characteristics of polycrystalline metallic materials are influenced significantly by various microstructural parameters, one of which is the grain size. Specifically, the strength and the toughness of polyc...
High Aspect Ratio Composite Wings: Geometrically Nonlinear Aeroelasticity, Multi-Disciplinary Design Optimization, Manufacturing, and Experimental Testing Farsadi, Touraj; Ahmadi, Majid; Şahin, Melin; Haddad Khodaparast, Hamed; Kayran, Altan; Friswell, Michael I. (2024-03-01) In the field of aerospace engineering, the design and manufacturing of high aspect ratio composite wings has become a focal point of innovation and efficiency. These long, slender wings, constructed with advanced materials...
Phase field modeling of fatigue crack growth retardation under single cycle overloads Waseem, Sarim; Erdoğan, Can; Yalçınkaya, Tuncay (2024-02-01) A zone-based crack retardation model that responds to single cycle overloads is applied to a phase field fatigue framework. Fatigue crack growth is incorporated through the degradation of fracture toughness in the phase fi...
High-fidelity simulations of low-velocity impact induced matrix cracking and dynamic delamination progression in CFRP beams Batmaz, Onur Ali; Bozkurt, Mirac Onur; Gürses, Ercan; Çöker, Demirkan (2024-02-01) A high-fidelity finite element model is constructed to simulate the low-velocity line-impact experiments conducted by Bozkurt and Coker on [05/903]s CFRP beams. The simulations utilize a user-implemented three-dimensional ...
High-speed observation of dynamic delamination failure in tapered composite laminates under tensile loading Bozkurt, Mirac Onur; ÖZEN, EMİNE BURÇİN; Yavuz, Burak Ogun; Parnas, Kemal Levend; Çöker, Demirkan (2024-01-01) This article presents high-fidelity observations of the time evolution of unstable delamination growth in tapered composite beams under tensile loading via ultra-high-speed camera in conjunction with digital image correlat...
Adjoint based aerodynamic shape optimization of a semi-submerged inlet duct and upstream inlet surface Küçük, Umut Can; Tuncer, İsmail Hakkı (2024-01-01) Aerodynamic performance of a semi-submerged inlet exposed to a significant amount of boundary layer ingestion is optimized using the open-source flow and adjoint solver SU2. Pressure recovery is taken as the objective func...
Experimental study on efficient propulsion system for multicopter UAV design applications Goli, Srikanth; Kurtuluş, Dilek Funda; Alhems, Luai M.; Memon, Azhar M.; Imran, Imil Hamda (2023-12-01) The usage of multicopter unmanned aerial vehicles (UAVs) has increased for various military and civilian purposes. The choice of propulsion system of such a vehicle is crucial to fulfill the intended mission requirements. ...
Estimating the pressure force around swimming plankton using micro particle image velocimetry Ergin, Fahrettin Gokhan; Gunaydinoglu, Erkan; Kurtuluş, Dilek Funda; Wadhwa, Navish (2023-12-01) Obtaining pressure force for freely swimming microorganisms is a challenging yet important problem. Here, we report the swimming kinematics and dynamics of the zooplankton Acartia tonsa nauplius investigated using Micro Pa...
A numerical ballistic performance investigation of Armox 500T steel through ductile damage models Göçmen, Yağmur; Erdoğan, Can; Yalçınkaya, Tuncay (2023-11-15) In this work, the ballistic response of an armor steel, Armox 500T, is numerically investigated through finite element (FE) analysis by utilizing the Johnson–Cook (JC) and modified Mohr–Coulomb (MMC) damage models, with a ...
A Numerical Study on the Ballistic Performance of Projectiles Formed by Shaped Charge Göçmen, Yağmur; Erdoğan, Can; Yalçınkaya, Tuncay (2023-11-01)
Analog sun sensor measurement correction using deep neural network Söken, Halil Ersin; Sozen, Semsettin Numan; Gokce, Murat; Yavuzyilmaz, Cagatay; Gulmammadov, Farid (2023-10-01) Sun sensors are commonly used attitude sensors because of their low cost, mass, volume, and power consumption. Analog Sun sensors (ANSS), which are smaller but usually less accurate than digital ones, are especially prefer...
Ductile failure of Inconel 718 during flow forming process and its numerical investigation Erdoğan, Can; Vural, Hande; Karakaş, Aptullah; Fenercioğlu, Tevfik Ozan; Yalçınkaya, Tuncay (2023-10-01) Understanding the fracture mechanisms and predicting failure in forming processes is of great interest to increase formability and numerical methods have been proven effective. Incremental forming processes such as flow fo...
Full envelope nonlinear flight controller design for a novel electric VTOL (eVTOL) air taxi Suiçmez, E.C.; Kutay, Ali Türker (2023-10-01) On-demand urban air transportation gains popularity in recent years with the introduction of the electric VTOL (eVTOL) aircraft concept. There is an emerging interest in short/medium range eVTOL air taxi considering the cr...
In-situ observation and numerical study of dynamic delamination in tapered composite laminates Dashatan, Saeid Hosseinpour; Parnas, Kemal Levend; Çöker, Demirkan; Bozkurt, Mirac Onur; Ozen, Emine Burcin (2023-05-15) In this study, dynamic delamination behavior in asymmetric GFRP tapered laminates under quasi-static tensile loading is investigated experimentally and numerically. Abaqus/Explicit cohesive interface modeling is utilized t...
Optimization of reward shaping function based on genetic algorithm applied to a cross validated deep deterministic policy gradient in a powered landing guidance problem Nugroho, Larasmoyo; Andiarti, Rika; Akmeliawati, Rini; Kutay, Ali Türker; Larasati, Diva Kartika; Wijaya, Sastra Kusuma (2023-04-01) One major capability of a Deep Reinforcement Learning (DRL) agent to control a specific vehicle in an environment without any prior knowledge is decision-making based on a well-designed reward shaping function. An importan...
Leading-Edge Vortex Characteristics of Surging-Translating Flexible Wings Yazdanpanah, Mahdi ; Perçin, Mustafa (2023-01-31) This study experimentally investigates the flow fields around rigid and chordwise-flexible wings, performing a rectilinear translational motion starting from rest. A rigid wing and two flexible wings with an intermediate d...
Creating tougher interfaces via suture morphology in 3D-printed multi-material polymer composites by fused filament fabrication Altuntas, Umut; Çöker, Demirkan; Yavas, Denizhan (2023-01-05) This study presents a facile strategy for architecting the interface morphology to create tougher and stronger interfaces in additively manufactured multi-material polymer composites. A sutural interfacial morphology betwe...
Unsteady aerodynamic performance of SD7062 airfoil at high Reynolds number Anilir, Berkan; Kurtuluş, Dilek Funda (2023-01-01) Aerodynamic performance of SD7062 airfoil in two-dimensional unsteady flows at high Reynolds number (Re approximate to 5 x 10(6)) has been investigated numerically for a wide range of angles of attack. The k-omega SST turb...

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