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Firat Irmak
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Journal Articles

A Novel Yield Criterion for Nickel-Based Superalloys

Firat Irmak, Kevin Hanekom, Alex Torkaman, Ali P. Gordon
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. May 2023, 145(5): 051016.
Paper No: GTP-22-1364
DOI: https://doi.org/10.1115/1.4055920
Published Online: January 10, 2023
View Article titled, A Novel Yield Criterion for Nickel-Based Superalloys
Click here to open pdf in another window PDF for A Novel Yield Criterion for Nickel-Based Superalloys
Topics: Alloys, Anisotropy, Modeling, Nickel, Superalloys, Temperature, Stress, Crystals
Journal Articles

A Comparative Study of Crystal Viscoplastic Modeling of Directionally Solidified Nickel-Base Superalloys

Navindra Wijeyeratne, Firat Irmak, Ali P. Gordon
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2023, 145(2): 021017.
Paper No: GTP-22-1432
DOI: https://doi.org/10.1115/1.4055512
Published Online: November 29, 2022
View Article titled, A Comparative Study of Crystal Viscoplastic Modeling of Directionally Solidified Nickel-Base Superalloys
Click here to open pdf in another window PDF for A Comparative Study of Crystal Viscoplastic Modeling of Directionally Solidified Nickel-Base Superalloys
Topics: Crystals, Modeling, Nickel, Simulation, Superalloys, Temperature, Stress, Viscoplasticity
Proceedings Papers

A Comparative Study of Crystal Visco-Plastic Modeling of Directionally Solidified Nickel-Base Superalloys

Navindra Wijeyeratne, Firat Irmak, Ali P. Gordon
Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT24A008, June 13–17, 2022
Paper No: GT2022-82230
DOI: https://doi.org/10.1115/GT2022-82230
View Paper titled, A Comparative Study of Crystal Visco-Plastic Modeling of Directionally Solidified Nickel-Base Superalloys
Click here to open pdf in another window PDF for A Comparative Study of Crystal Visco-Plastic Modeling of Directionally Solidified Nickel-Base Superalloys
Topics: Crystals, Modeling, Nickel, Superalloys
Proceedings Papers

A Novel Yield Criterion for Nickel-Based Superalloys

Firat Irmak, Kevin Hanekom, Alex Torkaman, Ali P. Gordon
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T17A022, June 13–17, 2022
Paper No: GT2022-83274
DOI: https://doi.org/10.1115/GT2022-83274
View Paper titled, A Novel Yield Criterion for Nickel-Based Superalloys
Click here to open pdf in another window PDF for A Novel Yield Criterion for Nickel-Based Superalloys
Topics: Nickel, Superalloys, Alloys, Crystals, Stress, Anisotropy, Gas turbines, High temperature, Solidification, Blades
Proceedings Papers

Establishing a Generic Stress-Life Framework for Single-Crystal Nickel-Base Superalloys

Firat Irmak, Sahil Karim, Nathan O’Nora, Ali P. Gordon
Proc. ASME. GT2022, Volume 7: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications, V007T17A023, June 13–17, 2022
Paper No: GT2022-83276
DOI: https://doi.org/10.1115/GT2022-83276
View Paper titled, Establishing a Generic Stress-Life Framework for Single-Crystal Nickel-Base Superalloys
Click here to open pdf in another window PDF for Establishing a Generic Stress-Life Framework for Single-Crystal Nickel-Base Superalloys
Topics: Crystals, Nickel, Stress, Superalloys, Creep, Temperature, Alloys, Damage, Fatigue, Cycles
Proceedings Papers

Crystal Visco-Plastic Model for Directionally Solidified Ni-Base Superalloys Under Monotonic and Low Cycle Fatigue

Navindra Wijeyeratne, Firat Irmak, Ali P. Gordon
Proc. ASME. GT2021, Volume 9B: Structures and Dynamics — Fatigue, Fracture, and Life Prediction; Probabilistic Methods; Rotordynamics; Structural Mechanics and Vibration, V09BT26A008, June 7–11, 2021
Paper No: GT2021-59581
DOI: https://doi.org/10.1115/GT2021-59581
View Paper titled, Crystal Visco-Plastic Model for Directionally Solidified Ni-Base Superalloys Under Monotonic and Low Cycle Fatigue
Click here to open pdf in another window PDF for Crystal Visco-Plastic Model for Directionally Solidified Ni-Base Superalloys Under Monotonic and Low Cycle Fatigue
Topics: Crystals, Low cycle fatigue, Modeling, Superalloys, Grain boundaries, Temperature, Anisotropy, Constitutive equations, Deformation, Gas turbines
Proceedings Papers

Crystal Visco-Plastic Model for Ni-Base Superalloys Under Thermomechanical Fatigue

Navindra Wijeyeratne, Firat Irmak, Ali P. Gordon, Jun-Young Jeon
Proc. ASME. GT2020, Volume 10B: Structures and Dynamics, V10BT27A003, September 21–25, 2020
Paper No: GT2020-14163
DOI: https://doi.org/10.1115/GT2020-14163
View Paper titled, Crystal Visco-Plastic Model for Ni-Base Superalloys Under Thermomechanical Fatigue
Click here to open pdf in another window PDF for Crystal Visco-Plastic Model for Ni-Base Superalloys Under Thermomechanical Fatigue
Topics: Anisotropy, Crystals, Fatigue, Modeling, Superalloys, Thermomechanics, Temperature, Stress, Hardening, Simulation
Proceedings Papers

A Life Prediction Model for Single-Crystal Nickel-Base Alloys Under Low-Cycle Fatigue

Firat Irmak, Navindra Wijeyeratne, Taejun Yun, Ali Gordon
Proc. ASME. GT2020, Volume 10B: Structures and Dynamics, V10BT27A005, September 21–25, 2020
Paper No: GT2020-14250
DOI: https://doi.org/10.1115/GT2020-14250
View Paper titled, A Life Prediction Model for Single-Crystal Nickel-Base Alloys Under Low-Cycle Fatigue
Click here to open pdf in another window PDF for A Life Prediction Model for Single-Crystal Nickel-Base Alloys Under Low-Cycle Fatigue
Topics: Alloys, Crystals, Low cycle fatigue, Nickel, Creep, Damage, Fatigue, Superalloys, Blades, Deformation
Journal Articles

A Nonstationary Uncertainty Model and Bayesian Calibration of Strain-Life Models

Arinan Dourado, Firat Irmak, Felipe A. C. Viana, Ali P. Gordon
Journal: Journal of Verification, Validation and Uncertainty Quantification
Article Type: Research-Article
J. Verif. Valid. Uncert. March 2021, 6(1): 011002.
Paper No: VVUQ-20-1038
DOI: https://doi.org/10.1115/1.4049324
Published Online: January 7, 2021
View Article titled, A Nonstationary Uncertainty Model and Bayesian Calibration of Strain-Life Models
Click here to open pdf in another window PDF for A Nonstationary Uncertainty Model and Bayesian Calibration of Strain-Life Models
Topics: Calibration, Fatigue life, Uncertainty, Errors, Alloys, Fatigue
Proceedings Papers

A Bayesian Framework for Estimation of Strain Life Lower Bounds and its Application to IN617

Arinan Dourado, Firat Irmak, Felipe A. C. Viana, Ali P. Gordon
Proc. ASME. GT2019, Volume 7A: Structures and Dynamics, V07AT31A020, June 17–21, 2019
Paper No: GT2019-91958
DOI: https://doi.org/10.1115/GT2019-91958
View Paper titled, A Bayesian Framework for Estimation of Strain Life Lower Bounds and its Application to IN617
Click here to open pdf in another window PDF for A Bayesian Framework for Estimation of Strain Life Lower Bounds and its Application to IN617
Topics: Alloys, Calibration, Combustion, Cycles, Design, Electromagnetic scattering, Failure, Fatigue life, Low cycle fatigue, Optimization
Proceedings Papers

Modeling the Torsional Cyclic Response of Direct Metal Laser Sintered Inconel 718

Sanna F. Siddiqui, Firat Irmak, Nathan O’Nora, Ali P. Gordon
Proc. ASME. GT2019, Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy, V006T24A015, June 17–21, 2019
Paper No: GT2019-91056
DOI: https://doi.org/10.1115/GT2019-91056
View Paper titled, Modeling the Torsional Cyclic Response of Direct Metal Laser Sintered Inconel 718
Click here to open pdf in another window PDF for Modeling the Torsional Cyclic Response of Direct Metal Laser Sintered Inconel 718
Topics: Lasers, Metals, Modeling, Additive manufacturing, Aerospace industry, Die cutting, Fatigue, Gas turbines, Shearing (Deformation), Aircraft engines
Proceedings Papers

A Crystal Visco-Plastic Model for Ni-Base Superalloys Under Low Cycle Fatigue

Navindra Wijeyeratne, Firat Irmak, Grant Geiger, Jun-Young Jeon, Ali Gordon
Proc. ASME. GT2019, Volume 7A: Structures and Dynamics, V07AT31A019, June 17–21, 2019
Paper No: GT2019-91903
DOI: https://doi.org/10.1115/GT2019-91903
View Paper titled, A Crystal Visco-Plastic Model for Ni-Base Superalloys Under Low Cycle Fatigue
Click here to open pdf in another window PDF for A Crystal Visco-Plastic Model for Ni-Base Superalloys Under Low Cycle Fatigue
Topics: Crystals, Low cycle fatigue, Superalloys, Gas turbines, Matlab, Stress, Anisotropy, Blades, Constitutive equations, Deformation
Proceedings Papers

A Framework for Life Prediction of 2.25Cr-1Mo Under Creep and Thermomechanical Fatigue

Firat Irmak, Ali P. Gordon
Proc. ASME. GT2018, Volume 6: Ceramics; Controls, Diagnostics, and Instrumentation; Education; Manufacturing Materials and Metallurgy, V006T24A020, June 11–15, 2018
Paper No: GT2018-76669
DOI: https://doi.org/10.1115/GT2018-76669
View Paper titled, A Framework for Life Prediction of 2.25Cr-1Mo Under Creep and Thermomechanical Fatigue
Click here to open pdf in another window PDF for A Framework for Life Prediction of 2.25Cr-1Mo Under Creep and Thermomechanical Fatigue
Topics: Creep, Fatigue, Thermomechanics, Damage, Temperature, Databases, Failure, Alloy steel, Alloys, Boilers
Proceedings Papers

Application of a Non-Interactive Constitutive Model for Life Prediction of 2.25Cr-1Mo Under Creep-Fatigue

Ali P. Gordon, Firat Irmak, Thomas Bouchenot, Bassem Felemban
Proc. ASME. IMECE2017, Volume 9: Mechanics of Solids, Structures and Fluids; NDE, Structural Health Monitoring and Prognosis, V009T12A010, November 3–9, 2017
Paper No: IMECE2017-71540
DOI: https://doi.org/10.1115/IMECE2017-71540
View Paper titled, Application of a Non-Interactive Constitutive Model for Life Prediction of 2.25Cr-1Mo Under Creep-Fatigue
Click here to open pdf in another window PDF for Application of a Non-Interactive Constitutive Model for Life Prediction of 2.25Cr-1Mo Under Creep-Fatigue
Topics: Constitutive equations, Creep, Fatigue, Temperature, Damage, Alloys, Plasticity, Alloy steel, Boilers, Corrosion resistance