Yılmaz, Okan Deniz

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https://hdl.handle.net/20.500.14411/8271
Name Variants
O.D.Yilmaz
Yilmaz, Okan Deniz
Okan Deniz, Yilmaz
Y.,Okan Deniz
O., Yilmaz
Yılmaz, Okan Deniz
O.D.Yılmaz
Yılmaz,O.D.
Y., Okan Deniz
Yilmaz,O.D.
O.,Yılmaz
Okan Deniz, Yılmaz
Job Title
Araştırma Görevlisi
Email Address
okan.yilmaz@atilim.edu.tr
Main Affiliation
Manufacturing Engineering
Status
Former Staff
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Scholarly Output

7

Articles

5

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36/370

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WoS Citation Count

50

Scopus Citation Count

63

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Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi1
Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi1
Journal of Materials Research and Technology1
Machining Science and Technology1
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Subject: Constitutive material model

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    Article
    Citation - WoS: 12
    Citation - Scopus: 11
    Effect of Constitutive Material Model on the Finite Element Simulation of Shear Localization Onset
    (Elsevier, 2020) Yilmaz, Okan Deniz; Oliaei, Samad Nadimi Bavil
    One of the most challenging problems in the field of machining is to determine the onset of shear localization. The consequences of the emergence of shear localized chips are fluctuations in the machining forces, tool wear, deterioration of the surface quality and out-of-tolerance machined components. Several constitutive material models are developed for the simulation of shear localization during machining, especially for Ti6Al4V. However, the accuracy and capability of the proposed models for the prediction of shear localization onset have not been investigated yet. In this study, the effect of different constitutive material models in the prediction of shear localization onset has been investigated. Different material models are studied including the Johnson-Cook (J-C) material model with Cockcroft-Latham damage model, J-C material model with a J-C damage model, models based on modified J-C material models (MJ-C) with strain softening terms, and material model with power-law type strain hardening and strain rate sensitivity, with polynomial thermal softening and polynomial temperature-dependent damage. The results of the finite element models are verified using orthogonal cutting experiments in terms of chip morphology and machining forces. Metallography techniques are used along with SEM observations to elucidate the distinction between continuous and shear localized chips. The results of this study indicate that three models are capable of predicting shear localization onset. However, when compared to the experiments, where a critical cutting speed of 2.8 m/min is obtained for shear localization onset, the results revealed that the model proposed by Sima and Ozel (2016) which is a model based on MJ-C model with temperature-dependent overarching modifier and temperature-dependent material model parameters is more accurate for the prediction of shear localization onset during machining Ti6Al4V. This model is shown to reveal a good prediction for the machining forces as well.