Researcher:
Bal, Burak

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PhD Student

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Burak

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Bal

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Bal, Burak

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2014 - 20167

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Researcher Of Publications: search.filters.isAuthorOfPublication.2419c0e8-4512-4f88-8f57-6ed1933de855

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Now showing 1 - 7 of 7
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    Twinning activity in high-manganese austenitic steels under high velocity loading
    (Taylor & Francis Ltd, 2016) Gerstein, G.; Maier, H. J.; N/A; N/A; Department of Mechanical Engineering; Gümüş, Berkay; Bal, Burak; Canadinç, Demircan; PhD Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 23433
    Deformation temperature and manganese content dependencies of twinning activity in two types of high Mn austenitic steels were investigated upon high velocity tensile loading. It was observed that nanotwin formation within previously formed twins dominates at subzero temperatures and significantly contributes to work hardening.
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    On the micro-deformation mechanisms active in high-manganese austenitic steels under impact loading
    (Elsevier Science Sa, 2015) Gerstein, G.; Maier, H. J; N/A; N/A; Department of Mechanical Engineering; Bal, Burak; Gümüş, Berkay; Canadinç, Demircan; PhD Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 23433
    The composition and temperature dependencies of deformation response of TWIP and XIP steels were investigated under high-velocity impact loading with a focus on micro-scale deformation mechanisms. The promotion of twinning deformation under high-velocity loading over the slip-twin interactions usually observed in low-velocity loading conditions was comprehensively examined with scanning electron microscopy and transmission electron microscopy. In addition, thermal analyses of plastic deformation were carried out by in situ thermal imaging. The current findings demonstrate that the deformation of TWIP steel is dictated by two major twin systems at elevated temperatures, while nano-twin formation within one primary twin system dominates at subzero temperatures. The XIP steel, on the other hand, deforms mainly by slip at elevated temperatures, while competing slip and twin activities, and eventually nano-twin formation within primary twins dominates as the temperature decreases. Overall, the current findings shed light on the complicated work hardening mechanisms prevalent in high-manganese austenitic steels utilizing high-velocity deformation experiments. (C) 2015 Elsevier B.V. All rights reserved.
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    Experimental and numerical evaluation of thickness reduction in steel pate heat exchangers
    (Asme, 2015) Akdari, E.; N/A; N/A; Department of Mechanical Engineering; Önal, Orkun; Bal, Burak; Canadinç, Demircan; PhD Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 23433
    A multiscale modeling approach was utilized to predict thickness reduction in steel plate heat exchangers (PHEs) utilized in combi boilers. The roles of texture and microstructure were successfully accounted for by properly coupling crystal plasticity and finite element analysis (FEA). In particular, crystal plasticity was employed to determine the proper multiaxial hardening rule to describe the material flow during the forming of PHEs, which was then implemented into the finite element (FE) metal-forming simulations. The current findings show that reliable thickness distribution predictions can be made with appropriate coupling of crystal plasticity and FEA in metal forming. Furthermore, the multiscale modeling approach presented herein constitutes an important guideline for the design of new PHEs with improved thermomechanical performance and reduced manufacturing costs.
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    A new venue toward predicting the role of hydrogen embrittlement on metallic materials
    (Springer, 2016) N/A; N/A; Department of Chemical and Biological Engineering; Department of Mechanical Engineering; Bal, Burak; Şahin, İbrahim; Uzun, Alper; Canadinç, Demircan; PhD Student; PhD Student; Faculty Member; Faculty Member; Department of Chemical and Biological Engineering; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; N/A; N/A; 59917; 23433
    This paper presents a new crystal plasticity formulation to predict the role of hydrogen embrittlement on the mechanical behavior of metallic materials. Specifically, a series of experiments were carried out to monitor the role of hydrogen interstitial content on the uniaxial tensile deformation response of iron alloyed with hydrogen, and the classical Voce hardening scheme was modified to account for the shear stresses imposed on arrested dislocations due to the surrounding hydrogen interstitials. The proposed set of physically grounded crystal plasticity formulations successfully predicted the deformation response of iron in the presence of different degrees of hydrogen embrittlement. Moreover, the combined experimental and modeling effort presented herein opens a new venue for predicting the alterations in the performance of metallic materials, where the hydrogen embrittlement is unavoidable.
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    Incorporation of dynamic strain aging Into a viscoplastic self-consistent model for predicting the negative strain rate sensitivity of hadfield steel
    (Asme, 2016) N/A; N/A; Department of Mechanical Engineering; Bal, Burak; Gümüş, Berkay; Canadinç, Demircan; PhD Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 23433
    A new multiscale modeling approach is proposed to predict the contributions of dynamic strain aging (DSA) and the resulting negative strain rate sensitivity (NSRS) on the unusual strain-hardening response of Hadfield steel (HS). Mechanical response of HS was obtained from monotonic and strain rate jump experiments under uniaxial tensile loading within the 10(-4) to 10(-1) s(-1) strain rate range. Specifically, a unique strain-hardening model was proposed that incorporates the atomic-level local instabilities imposed upon by the pinning of dislocations by diffusing carbon atoms to the classical Voce hardening. The novelty of the current approach is the computation of the shear stress contribution imposed on arrested dislocations leading to DSA at the atomic level, which is then implemented to the overall strain-hardening rule at the microscopic level. The new model not only successfully predicts the role of DSA and the resulting NSRS on the macroscopic deformation response of HS but also opens the venue for accurately predicting the deformation response of rate-sensitive metallic materials under any given loading condition.
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    Twinning activities in high-mn austenitic steels under high-velocity compressive loading
    (2015) Gerstein, G.; Maier, H. J.; Güner, F.; Elmadağlı, M.; N/A; N/A; Department of Mechanical Engineering; Gümüş, Berkay; Bal, Burak; Canadinç, Demircan; PhD Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 23433
    High-velocity compression tests were carried out on three different types of high-manganese (Mn) austenitic steels, namely Hadfield, TWIP and XIP steels, with the purpose of favoring twinning over slip. The experiments were conducted at three temperatures: -170 degrees C, room temperature and 200 degrees C, in order to cover both ductile and brittle deformation ranges. Various mechanisms such as slip, formation of more than one twin variant, nano-twins inside primary twins and voids were activated in Hadfield steel, while the deformation was twin-dominated in TWIP steel at all temperatures, which stems from the increase in stacking fault energy (SFE) due to the higher Mn content. The XIP steel with the highest SFE, on the other hand, deformed mostly by slip at elevated temperatures, even though extensive twin and nano-twin formation was prevalent in the microstructure as the temperature decreased to room temperature, and then to -170 degrees C, respectively. The current set of results lay out the roles of temperature, deformation velocity and alloy content on the microstructure evolution of high-Mn steels, which altogether can be tailored to improve the work hardening capacity of this class of materials.
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    Microstructure-based modeling of the impact response of a biomedical niobium-zirconium alloy
    (Cambridge University Press (CUP), 2014) Maier, Hans J.; N/A; N/A; N/A; N/A; Department of Mechanical Engineering; Önal, Orkun; Bal, Burak; Toker, Sıdıka Mine; Mirzajanzadeh, Morad; Canadinç, Demircan; PhD Student; PhD Student; PhD Student; PhD Student; Faculty Member; Department of Mechanical Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 255504; N/A; 23433
    This article presents a new multiscale modeling approach proposed to predict the impact response of a biomedical niobium-zirconium alloy by incorporating both geometric and microstructural aspects. Specifically, the roles of both anisotropy and geometry-based distribution of stresses and strains upon loading were successfully taken into account by incorporating a proper multiaxial material flow rule obtained from crystal plasticity simulations into the finite element (FE) analysis. The simulation results demonstrate that the current approach, which defines a hardening rule based on the location-dependent equivalent stresses and strains, yields more reliable results as compared with the classical FE approach, where the hardening rule is based on the experimental uniaxial deformation response of the material. This emphasizes the need for proper coupling of crystal plasticity and FE analysis for the sake of reliable predictions, and the approach presented herein constitutes an efficient guideline for the design process of dental and orthopedic implants that are subject to impact loading in service.