Bal, Burak
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Bal, B. Bal, Burak Burak Bal
Job Title
Prof. Dr.
Email Address
burak.bal@agu.edu.tr
Main Affiliation
02.06. Makine Mühendisliği
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Current Staff
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No research topics data found.
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
0
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3GOOD HEALTH AND WELL-BEING
1
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4QUALITY EDUCATION
0
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5GENDER EQUALITY
0
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6CLEAN WATER AND SANITATION
0
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7AFFORDABLE AND CLEAN ENERGY
7
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8DECENT WORK AND ECONOMIC GROWTH
0
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9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
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10REDUCED INEQUALITIES
0
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11SUSTAINABLE CITIES AND COMMUNITIES
0
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12RESPONSIBLE CONSUMPTION AND PRODUCTION
0
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13CLIMATE ACTION
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14LIFE BELOW WATER
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15LIFE ON LAND
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
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17PARTNERSHIPS FOR THE GOALS
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Documents
46
Citations
871
h-index
16
Documents
41
Citations
768
No records found in other affiliations.
Scholarly Output
49
Articles
36
Views / Downloads
531/475
Supervised MSc Theses
3
Supervised PhD Theses
3
WoS Citation Count
654
Scopus Citation Count
743
Patents
0
Projects
0
WoS Citations per Publication
13.35
Scopus Citations per Publication
15.16
Open Access Source
18
Supervised Theses
6
| Journal | Count |
|---|---|
| International Journal of Hydrogen Energy | 7 |
| Materials Research Express | 4 |
| Journal of Engineering Materials and Technology-Transactions of the Asme | 4 |
| Materials Testing | 3 |
| Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing | 2 |
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49 results
Scholarly Output Search Results
Now showing 1 - 10 of 49
Conference Object Numerical Study of Magnesium-Based Metal Hydride Reactor Incorporating Multi-Phase Heat Exchanger for Thermal Energy Storage System(Scanditale AB, 2021-03-02) Yao, Jing; Zhu, Pengfei; Ren, Jianwei; Kapci, Mehmet Fazil; Bal, Burak; Kurko, Sandra V.; Zhang, Z. X.Metal hydride based thermal energy storage system is regarded as a promising method due to its good reversibility, low cost, and no by-product. Multi-phase heat exchange has much higher heat transfer coefficient than single-phase fluid heat exchange, thus facilitating the steam generation. In this study, a two-dimensional model of the metal hydride reactor using multi-phase heat exchange is proposed to estimate the performance and its feasibility of application in the concentrated solar power system. The results show that the velocity of the heat transfer fluid should match well with the thermal conductivity of the metal hydride bed to maintain the heat flux at a relatively constant value. The match of thermal conductivity of 3 or 5 W/(m·K) and fluid velocity of 0.0050 m/s results in the heat flux up to about 19 kW/m2, which is increased by 3 orders of magnitude than single-phase heat exchange. This study helps to facilitate the widespread application of metal hydride based thermal energy storage system in the concentrated solar power system. © 2024 Elsevier B.V., All rights reserved.Research Project Farklı Mikroyapısal Değişkenlerin Yüksek Manganlı Fe-%33Mn Çeliğinin Pekleşme Davranışına Etkilerinin Araştırılması(TUBİTAK, 2019) Bal, Burakİleri yüksek mukavemetli çelikler sahip olmuş oldukları yüksek mukavemet, yüksek süneklik ve_x000D_ yüksek pekleşme kabiliyeti gibi üstün özellikler sayesinde otomotiv, demiryolu, savunma sanayi_x000D_ uygulamalarında ve yapı endüstrisi gibi pek çok farklı alanda tercih edilmektedir. Bu projede yeni_x000D_ nesil yüksek mukavemetli çelikler sınıfından olan yüksek manganlı çeliklerin pekleşme_x000D_ davranışına etki eden farklı mikroyapısal değişkenlerin etkisi kristal plastisite modellemesi_x000D_ yoluyla araştırılmıştır. Öncelikle östenitik Fe-33Mn çeliğinin 1x10-4 s_x000D_ -1 gerinim hızındaki malzeme_x000D_ davranışının, tane sayısı gibi faktörleri girdi olarak kullanarak kristal plastisite modellemesi_x000D_ yapılmıştır ve pekleşme sabitleri bulunmuştur. Daha sonra bulunan pekleşme sabitleri sabit_x000D_ tutularak, malzeme dokusu, hız gradyanı, gerinim artışı ve etkileşim tensörü cinsi gibi tek bir_x000D_ mikroyapısal girdi değiştirilerek bu girdilerin malzemenin toplam pekleşme davranışına etkisi_x000D_ açığa çıkarılmıştır. Spesifik olarak, proje önerisinin üzerine konularak farklı karbon_x000D_ konsantrasyonlarının pekleşme sabitlerine olan etkisi de hesaplanmıştır. Bahsi geçen çeliğin_x000D_ oda sıcaklığında ve düşük gerinim hızındaki malzeme davranışı proje yürütücüsünün daha_x000D_ önceki çalışmalarında çekme testi yardımı ile makro ölçekte gözlemlenmiştir. Fe-33Mn çeliğinin_x000D_ seçilme nedeni, yüksek mangalı östenitik çeliklerinin sahip olduğu çok yüksek pekleşme_x000D_ kapasitesi ile birlikte yüksek süneklik değerleri ve aşınma direnci sayesinde uzay-havacılık,_x000D_ otomotiv, savunma sanayi gibi öncül sektörlerde yer alması ve önümüzdeki yıllarda çok daha_x000D_ fazla miktarda yer alacağına inanılmasıdır. Bu konunun seçilme nedeni ise, bugüne kadar_x000D_ yapılan kristal plastisite çalışmalarında deneysel davranışı modelleyebilmek için genelde tek tip_x000D_ malzeme dokusu, hız gradyanı, gerinim artışı ve etkileşim tensörü kullanılmıştır. Bu doğru bir_x000D_ yaklaşım olmasına rağmen bu girdilerin toplam malzeme pekleşme davranışına etkisi_x000D_ bilinmemektedir. Bu kapsamda kristal plastisite modellemeleri Visco-Plastic Self-Consistent_x000D_ (VPSC) algoritması yardımı ile gerçekleştirilmiştir. Fe-33Mn çeliğinin düşük gerinim hızındaki tek_x000D_ eksenli deformasyon davranışı voce tipi pekleşme teorisi ile modellenmiştir ve bulunan Voce_x000D_ parametreleri bütün simülasyonlarda aynı kalmıştır. Böylelikle değişik mikroyapısal değişkenlerin_x000D_ Fe-33Mn çeliğinin pekleşme davranışına etkileri aynı pekleşme teorisi ile açığa çıkarılmıştır.Article Citation - WoS: 4Citation - Scopus: 5Effect of Pre-Rolling Temperature on the Interfacial Properties and Formability of Steel-Steel Bilayer Sheet in Single Point Incremental Forming(Sage Publications Ltd, 2020-10-14) Hassan, Malik; Hussain, Ghulam; Ali, Aaqib; Ilyas, Muhammad; Malik, Sohail; Khan, Wasim A.; Bal, BurakThe aim of this research was to investigate the effect of pre-rolling temperature on the interfacial properties in delamination modes 1 and 2; and formability in Single Point Incremental Forming (SPIF) of Steel-Steel (St-St) bilayer sheet prepared by roll bonding process. The roll bonding process was performed at three pre-rolling temperatures, 700 degrees C, 800 degrees C, and 950 degrees C, with a constant thickness reduction ratio of 58%. The bond strength and critical strain energy release rate (CSERR) were measured to characterize the interface of St-St bilayer sheet. T-peel test for mode 1 and tensile shear test for mode 2 were conducted to determine the interfacial properties. The formability of St-St bilayer sheet in SPIF was measured in terms of maximum wall angle. The results showed that the increase in pre-rolling temperature from 700 degrees C to 950 degrees C enhanced the bond strength and CSERR, in both mode 1 and 2. The enhancement in bond strength with an increase in pre-rolling temperature was 149.5% and 203% in mode 1 and 2, respectively. However, the increase in CSERR in mode 1 and 2 was 115% and 367%, respectively. The formability of St-St bilayer sheet also showed an increasing trend with an increase in pre-rolling temperature. Moreover, a consistent relation between formability and interfacial parameters was observed. It was also found that to successively deform the bilayer sheet into the desired shape, it is necessary for the sheet to be heated above the critical temperature during fabrication to facilitate good bonding between two sheets.Article Citation - WoS: 14Citation - Scopus: 15Lateral Angular Co-Extrusion: Geometrical and Mechanical Properties of Compound Profiles(MDPI, 2020-08-28) Thuerer, Susanne Elisabeth; Peddinghaus, Julius; Heimes, Norman; Bayram, Ferdi Caner; Bal, Burak; Uhe, Johanna; Klose, Christian; Thürer, Susanne ElisabethA novel co-extrusion process for the production of coaxially reinforced hollow profiles has been developed. Using this process, hybrid hollow profiles made of the aluminum alloy EN AW-6082 and the case-hardening steel 20MnCr5 (AISI 5120) were produced, which can be forged into hybrid bearing bushings by subsequent die forging. For the purpose of co-extrusion, a modular tooling concept was developed where steel tubes made of 20MnCr5 are fed laterally into the tool. This LACE (lateral angular co-extrusion) process allows for a variation of the volume fraction of the reinforcement by using steel tubes with different wall thicknesses, which enabled the production of compound profiles having reinforcement contents of either 14 vol.% or 34 vol.%. The shear strength of the bonding area of these samples was determined in push-out tests. Additionally, mechanical testing of segments of the hybrid profiles using shear compression tests was employed to provide information about the influence of different bonding mechanisms on the strength of the composite zone.Doctoral Thesis Yapay Zeka Destekli Shot Peening Prosesinin Optimizasyonu ve İkincil Proseslerin SLM ile Üretilen AlSi10Mg Alaşımının Hidrojen Kırılganlık Direnci ve Mekanik Performansı Üzerindeki Etkilerinin İncelenmesi(2025) Karaveli, Kadir Kaan; Bal, BurakBu tez, Seçici Lazer Ergitme (SLM) yöntemiyle üretilen AlSi10Mg alaşımlarında bilyalı dövme işlemlerinin optimizasyonunu ve hidrojen gevrekliğinin azaltılmasını araştırmaktadır. Birinci bölümde, süreç optimizasyon yöntemleri (ör. Taguchi, Box-Behnken), metal katkı üretimdeki (AM) sorunlar (artık gerilme, gözeneklilik) ve hidrojen gevrekliğinin mekanizmaları ile test yöntemleri ele alınmıştır. İkinci ve üçüncü bölümler, Almen testleriyle doğrulanan yapay zeka tabanlı yaklaşımlarla bilyalı dövme yoğunluğunun optimizasyonunu ve Bell 412EP ile Piper PA-32R gibi gerçek havacılık arızalarını inceleyerek hidrojen gevrekliğinin bileşenlerdeki etkilerini analiz etmektedir. Dördüncü ve beşinci bölümler, SLM ile üretilen AlSi10Mg alaşımlarının mekanik performansına, gerinim hızı ve işlem sonrası uygulamaların (bilyalı dövme, ısıl işlem) etkilerini değerlendirmiş ve yorulma direncinde önemli iyileşmeler göstermiştir. Ayrıca hidrojen gevrekliğini önlemek için ileri düzey stratejiler önerilmiştir. Tez, artırılmış malzeme güvenilirliği ve sürdürülebilirliğin toplumsal faydalarını vurgulamakta ve yapay zeka destekli yöntemler ile üretimde gerçek zamanlı izleme sistemleri üzerine gelecekteki araştırmaları önermektedir.Article Citation - WoS: 12Citation - Scopus: 12Edge Dislocation Depinning From Hydrogen Atmosphere in Α-Iron(Pergamon-Elsevier Science Ltd, 2024-07) Kapci, Mehmet Fazil; Yu, Ping; Marian, Jaime; Liu, Guisen; Shen, Yao; Li, Yang; Bal, BurakUnderstanding the dislocation motion in hydrogen atmosphere is essential for revealing the hydrogen-related degradation in metallic materials. Atomic simulations were adopted to investigate the interaction between dislocations and hydrogen atoms, where the realistic hydrogen distribution in the vicinity of the dislocation core was emulated from the Grand Canonical Monte Carlo computations. The depinning of edge dislocations in alpha-Fe at different temperatures and hydrogen concentrations was then studied using Molecular Dynamics simulations. The results revealed that an increase in bulk hydrogen concentration increases the flow stress due to the pinning effect of solute hydrogen. The depinning stress was found to decrease due to the thermal activation of the edge dislocation at higher temperatures. In addition, prediction of the obtained results was performed by an elastic model that can correlate the bulk hydrogen concentration to depinning stress.Conference Object Citation - Scopus: 1Data-Driven Discovery and DFT Modeling of Fe4H on the Atomistic Level(Elsevier B.V., 2024) Zagorac, Dejan; Zagorac, Jelena; Djukic, Milos B.; Bal, Burak; Schön, Johann ChristianSince their discovery, iron and hydrogen have been two of the most interesting elements in scientific research, with a variety of known and postulated compounds and applications. Of special interest in materials engineering is the stability of such materials, where hydrogen embrittlement has gained particular importance in recent years. Here, we present the results for the Fe-H system. In the past, most of the work on iron hydrides has been focused on hydrogen-rich compounds since they have a variety of interesting properties at extreme conditions (e.g. superconductivity). However, we present the first atomistic study of an iron-rich Fe4H compound which has been predicted using a combination of data mining and quantum mechanical calculations. Novel structures have been discovered in the Fe4H chemical system for possible experimental synthesis at the atomistic level. © 2024 Elsevier B.V., All rights reserved.Article Citation - WoS: 4Citation - Scopus: 4A Phenomenological Hydrogen Induced Edge Dislocation Mobility Law for Bcc Fe Obtained by Molecular Dynamics(Pergamon-Elsevier Science Ltd, 2024-10) Baltacioglu, Mehmet Furkan; Kapci, Mehmet Fazil; Schoen, J. Christian; Marian, Jaime; Bal, Burak; Schön, J. ChristianInvestigating the interaction between hydrogen and dislocations is essential for understanding the origin of hydrogen-related fractures, specifically hydrogen embrittlement (HE). This study investigates the effect of hydrogen on the mobility of 1/2<111>{110} and 1/2<111>{112} edge dislocations in body-centered cubic (BCC) iron (Fe). Specifically, molecular dynamics (MD) simulations are conducted at various stress levels and temperatures for hydrogen-free and hydrogen-containing lattices. The results show that hydrogen significantly reduces dislocation velocities due to the pinning effect. Based on the results of MD simulations, phenomenological mobility laws for both types of dislocations as a function of stress, temperature and hydrogen concentration are proposed. Current findings provide a comprehensive model for predicting dislocation behavior in hydrogencontaining BCC lattices, thus enhancing the understanding of HE. Additionally, the mobility laws can be utilized in dislocation dynamics simulations to investigate hydrogen-dislocation interactions on a larger scale, aiding in the design of HE-resilient materials for industrial applications.Article Tuning Mechanical Performance of PCL Scaffolds: Influence of 3D Bioprinting Parameters, Polymer Concentration, and Solvent Selection(IOP Publishing Ltd, 2025-09-01) Ceylan, Saniye Aylin; Baltacioglu, Mehmet Furkan; Bal, Burak; Bayram, Ferdi Caner; Isoglu, Ismail AlperThe mechanical performance of three-dimensional (3D) bioprinted scaffolds is susceptible to printing parameters and material formulation. In this study, poly (epsilon-caprolactone) (PCL) scaffolds were fabricated using four different polymer concentrations (10%, 25%, 50%, and 75% w/v) to investigate how these variations, along with process parameters, influence mechanical behavior. Maintaining the structural integrity of bioprinted constructs requires careful optimization of polymer concentration and precise control over parameters such as printing speed, pressure, and infill density. Tensile tests were conducted to evaluate the effects of these variables. Among the tested conditions, a 50% (w/v) concentration allowed for a broader operational window, enabling fabrication across a range of printing speeds and pressures. At a printing speed of 5 mm s-1, PCL-DCM exhibited a Young's modulus of 39.0 MPa, while PCL-CF samples printed at 10 mm s-1 achieved the highest modulus of 32.0 MPa. Notably, when the printing speed was kept constant, applying higher pressures led to an increase in Young's modulus, suggesting that pressure plays a key role in enhancing scaffold stiffness. When comparing the 50% and 75% (w/v) polymer concentrations, the 50% (w/v) formulation stood out by offering both higher elongation and greater stiffness, which makes it particularly suitable for load-bearing applications. These findings provide a quantitative framework for optimizing extrusion-based bioprinting of PCL scaffolds, with implications for customized biomedical implants and regenerative medicine.Article Citation - WoS: 9Citation - Scopus: 13The Precise Determination of the Johnson-Cook Material and Damage Model Parameters and Mechanical Properties of an Aluminum 7068-T651 Alloy(ASME, 2019-03-12) Bal, B.; Karaveli, K. K.; Cetin, B.; Gumus, B.Al 7068-T651 alloy is one of the recently developed materials used mostly in the defense industry due to its high strength, toughness, and low weight compared to steels. The aim of this study is to identify the Johnson-Cook (J-C) material model parameters, the accurate Johnson-Cook (J-C) damage parameters, D-1, D-2, and D-3 of the Al 7068-T651 alloy for finite element analysis-based simulation techniques, together with other damage parameters, D-4 and D-5. In order to determine D-1, D-2, and D-3, tensile tests were conducted on notched and smooth specimens at medium strain rate, 10(0) s(-1), and tests were repeated seven times to ensure the consistency of the results both in the rolling direction and perpendicular to the rolling direction. To determine D-4 and D-5 further, tensile tests were conducted on specimens at high strain rate (10(2) s(-1)) and temperature (300 degrees C) by means of the Gleeble thermal-mechanical physical simulation system. The final areas of fractured specimens were calculated through optical microscopy. The effects of stress triaxiality factor, rolling direction, strain rate, and temperature on the mechanical properties of the Al 7068-T651 alloy were also investigated. Damage parameters were calculated via the Levenberg-Marquardt optimization method. From all the aforementioned experimental work, J-C material model parameters were determined. In this article, J-C damage model constants, based on maximum and minimum equivalent strain values, were also reported which can be utilized for the simulation of different applications.