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Nathan O'Nora
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Journal Articles

Temperature Margin Calculation During Finite Element Creep Simulations

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William David Day, Nathan O'Nora, Ali P. Gordon
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. May 2025, 147(5): 051030.
Paper No: GTP-24-1666
https://doi.org/10.1115/1.4066896
Published Online: December 20, 2024
View Articletitled, Temperature Margin Calculation During Finite Element Creep Simulations
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Topics: Creep, Damage, Finite element analysis, Stress, Temperature, Simulation
Proceedings Papers

Temperature Margin Calculation During Finite Element Creep Simulations

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William Day, Nathan O’Nora, Ali P. Gordon
Proc. ASME. GT2024, Volume 9: Manufacturing Materials and Metallurgy; Microturbines, Turbochargers, and Small Turbomachines; Oil & Gas Applications; Steam Turbine, V009T17A004, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-121776
https://doi.org/10.1115/GT2024-121776
View Paper titled, Temperature Margin Calculation During Finite Element Creep Simulations
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Topics: Creep, Damage, Finite element analysis, Rupture, Simulation, Temperature
Proceedings Papers

Expansion of Neuber Rule to 3-D Stress States for Anisotropic Materials

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Nathan O’Nora, William D. Day
Proc. ASME. GT2023, Volume 11B: Structures and Dynamics — Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction; Probabilistic Methods; Rotordynamics; Structural Mechanics and Vibration, V11BT24A007, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104031
https://doi.org/10.1115/GT2023-104031
View Paper titled, Expansion of Neuber Rule to 3-D Stress States for Anisotropic Materials
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Topics: Anisotropy, Crystals, Stress
Proceedings Papers

A Novel Multiaxial Strain-Life Approach for Nickel-Base Superalloys

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Firat Irmak, Nathan O’Nora, Ali P. Gordon
Proc. ASME. GT2023, Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy, V008T17A015, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103044
https://doi.org/10.1115/GT2023-103044
View Paper titled, A Novel Multiaxial Strain-Life Approach for Nickel-Base Superalloys
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Topics: Nickel, Superalloys, Stress, Fatigue, Fatigue life, High temperature, Modeling, Alloys, Anisotropy, Blades
Proceedings Papers

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

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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-83276
https://doi.org/10.1115/GT2022-83276
View Paper titled, Establishing a Generic Stress-Life Framework for Single-Crystal Nickel-Base Superalloys
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Topics: Crystals, Nickel, Stress, Superalloys, Creep, Temperature, Alloys, Damage, Fatigue, Cycles
Proceedings Papers

Experimental and Analytical Investigation of Cyclic Crack Initiation in Nickel Based Super Alloy With Stress Concentration Features

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Alex Torkaman, Steve Fiebiger, Nathan O’Nora, Devin O’Neal, Ali Gordon
Proc. ASME. GT2021, Volume 9B: Structures and Dynamics — Fatigue, Fracture, and Life Prediction; Probabilistic Methods; Rotordynamics; Structural Mechanics and Vibration, V09BT26A009, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59608
https://doi.org/10.1115/GT2021-59608
View Paper titled, Experimental and Analytical Investigation of Cyclic Crack Initiation in Nickel Based Super Alloy With Stress Concentration Features
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Topics: Alloys, Fracture (Materials), Nickel, Stress concentration, Turbine blades
Proceedings Papers

Comparison of Viscoplastic Modeling of an Equiaxed and Directionally Solidified Ni-Base Superalloy

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Nathan O’Nora, Alex Torkaman, Ali P. Gordon
Proc. ASME. GT2020, Volume 10B: Structures and Dynamics, V10BT27A026, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16244
https://doi.org/10.1115/GT2020-16244
View Paper titled, Comparison of Viscoplastic Modeling of an Equiaxed and Directionally Solidified Ni-Base Superalloy
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Topics: Modeling, Superalloys, Viscoplasticity
Proceedings Papers

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

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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91056
https://doi.org/10.1115/GT2019-91056
View Paper titled, Modeling the Torsional Cyclic Response of Direct Metal Laser Sintered Inconel 718
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Topics: Lasers, Metals, Modeling, Additive manufacturing, Aerospace industry, Die cutting, Fatigue, Gas turbines, Shearing (Deformation), Aircraft engines
Proceedings Papers

Constitutive Modeling of TMF and Creep-Fatigue of a Ni-Base Alloy

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Nathan O’Nora, Thomas Bouchenot, Grant Geiger, Ali P. Gordon
Proc. ASME. GT2019, Volume 7A: Structures and Dynamics, V07AT31A016, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91695
https://doi.org/10.1115/GT2019-91695
View Paper titled, Constitutive Modeling of TMF and Creep-Fatigue of a Ni-Base Alloy
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Topics: Alloys, Creep, Fatigue, Modeling, Hardening, Stress, Fittings, High temperature, Kinematics, Engineering simulation
Proceedings Papers

Modeling the Influence of Build Orientation on the Monotonic and Cyclic Response of Additively Manufactured Stainless Steel GP1/17-4PH

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Sanna F. Siddiqui, Nathan O’Nora, Abiodun A. Fasoro, Ali P. Gordon
Proc. ASME. IMECE2017, Volume 14: Emerging Technologies; Materials: Genetics to Structures; Safety Engineering and Risk Analysis, V014T11A003, November 3–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2017-71561
https://doi.org/10.1115/IMECE2017-71561
View Paper titled, Modeling the Influence of Build Orientation on the Monotonic and Cyclic Response of Additively Manufactured Stainless Steel GP1/17-4PH
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Topics: Additive manufacturing, Modeling, Stainless steel, Equipment performance, Failure, Low cycle fatigue, Manufacturing, Approximation, Constitutive equations, Design