Browsing by Author "Baranoğlu,B."
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Article Citation Count: 0An adaptive element division algorithm for accurate evaluation of singular and near singular integrals in 3D(Turkiye Klinikleri, 2021) Yazıcı, Ali; Baranoğlu,B.; Baranoğlu, Besim; Software Engineering; Manufacturing EngineeringAn adaptive algorithm for evaluation of singular and near singular integrals in 3D is presented. The algorithm is based on successive adaptive/selective subdivisions of the element until a prescribed error criteria is met. For evaluating the integrals in each subdivision, Gauss quadrature is applied. The method is computationally simple, memory efficient and can be applied for both triangular and quadrilateral elements, including the elements with nonplanar and/or curved surfaces. To assess the method, several examples are discussed. It has shown that the algorithm performs well for singular and near-singular integral examples presented in the paper and evaluates the integrals with very high accuracy. © TÜBİTAKArticle Citation Count: 2A new formulation for the boundary element analysis of heat conduction problems with nonlinear boundary conditions;(Turk Isı Bilimi ve Teknigi Dernegi, 2019) Baranoğlu, Besim; Manufacturing EngineeringAn effective numerical method based on the boundary element formulation is presented to solve heat conduction equations which are governed by the Fourier equation, with nonlinear boundary conditions on one or more sections of the prescribed boundary. The solution involves the manipulation of the system matrices of the boundary element method and obtaining a smaller ranked matrix equation in which the unknown is only the temperature difference over the nonlinear boundary condition region. This way, the iterations to deal with the nonlinear conditions are performed faster. After finding the solution over the nonlinear boundary condition region, the solution over the entire boundary is obtained as a post-process through a prescribed relation. An example with a proven exact solution is employed to assess the results. © 2019 TIBTD Printed in TurkeyConference Object Citation Count: 0Predicting the topology of the bending corner in bending of ultra high strength steels through finite element analysis(TANGER Ltd., 2019) Billur, Eren; Baranoğlu, Besim; Baranoğlu,B.; Toptaş,U.; Aliç,Ö.; Manufacturing Engineering; Automotive EngineeringIn bending of plates, unlike the case of sheet metal forming, a 3-D stress state is valid. Moreover, apart from the some very specific cases, the plane strain assumption is not appropriate either. Therefore; bending of thick ultra-high strength steel (UHSS) plates is a deformation process where 3-D stress and strain states exist in general. This study basically focuses on the prediction of the bending corner topology with non-linear finite element analysis method, since the laser-cut edges of the UHSS are particularly prone to edge cracking during bending operation. Within the scope of this study, an experimental set-up is designed which consists of bending tools and a servo mechanical press. The samples were bent by means of this set-up in an air-bending operation up to 90°. This experimental work was followed by optical scanning measurements. And finally, the FEA results and the scanning data were compared in 3-D space. The results showed good correlation. As a future study, the 3-D strain field of the bending corner will be tried to be measured by a professional digital image correlation (DIC) system which could probably give more precise data when combined with the data from FEA. © 2019 TANGER Ltd., Ostrava.