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Journal Articles

Determination and Sensitivity Analysis of Target Flaw Sizes for Performance Demonstration of Cast Austenitic Stainless Steel Pipe by Probabilistic Fracture Mechanics

Daiki Takagoshi, Yuji Momotani, Yuichiro Nomura, Wataru Nishi, Takatoshi Hirota, Kiminobu Hojo
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. April 2025, 147(2): 021303.
Paper No: PVT-23-1142
https://doi.org/10.1115/1.4067591
Published Online: January 29, 2025
View Article titled, Determination and Sensitivity Analysis of Target Flaw Sizes for Performance Demonstration of Cast Austenitic Stainless Steel Pipe by Probabilistic Fracture Mechanics
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Topics: Failure, Fracture (Materials), Fracture (Process), Fracture mechanics, Fracture toughness, Mechanical properties, Pipes, Probability, Stress, Tensile strength
Proceedings Papers

Plastic Constraint Correction Factor X for Brittle Fracture in Ductile-Brittle Transition Temperature Region

Kiminobu Hojo, Takatoshi Hirota, Yasuto Nagoshi, Takuya Fukahori, Kazuma Shimizu, Masaki Shimodaira, Takuya Ogawa, Kenji Yashirodai, Mitsuru Ohata, Fumiyoshi Minami
Proc. ASME. PVP2024, Volume 1: Codes & Standards; Computer Technology & Bolted Joints, V001T01A066, July 28–August 2, 2024
Publisher: American Society of Mechanical Engineers
Paper No: PVP2024-123140
https://doi.org/10.1115/PVP2024-123140
View Paper titled, Plastic Constraint Correction Factor X for Brittle Fracture in Ductile-Brittle Transition Temperature Region
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Topics: Brittle fracture, Ductile-brittle transition, Fracture (Materials), Fracture (Process), Temperature, Reactor vessels, Shapes, Yield strength, Ductile fracture, Geometry
Proceedings Papers

Comparison of K-Solutions of Rectangular Flaw With Semi-Elliptical Flaw for PWSCC Growth Analysis

Kiminobu Hojo, David Rudland
Proc. ASME. ICONE31, Volume 5: Nuclear Safety, Security, and Cyber Security; Nuclear Codes, Standards, Licensing, and Regulatory Issues, V005T06A009, August 4–8, 2024
Publisher: American Society of Mechanical Engineers
Paper No: ICONE31-136517
https://doi.org/10.1115/ICONE31-136517
View Paper titled, Comparison of K-Solutions of Rectangular Flaw With Semi-Elliptical Flaw for PWSCC Growth Analysis
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Topics: ASME Standards, Coolants, Fracture (Materials), Japan Society of Mechanical Engineers, JSME Standards, Metals, Pipes, Shapes, Stress corrosion cracking, Surges
Proceedings Papers

Constraint Effect on Fracture in Ductile-Brittle Transition Temperature Region (Report 3)

Kiminobu Hojo, Takatoshi Hirota, Yasuto Nagoshi, Takuya Fukahori, Kimihisa Sakima, Mitsuru Ohata, Fumiyoshi Minami
Proc. ASME. PVP2023, Volume 1: Codes & Standards, V001T01A006, July 16–21, 2023
Publisher: American Society of Mechanical Engineers
Paper No: PVP2023-105965
https://doi.org/10.1115/PVP2023-105965
View Paper titled, Constraint Effect on Fracture in Ductile-Brittle Transition Temperature Region (Report 3)
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Topics: Ductile fracture, Ductile-brittle transition, Fracture (Materials), Fracture (Process), Stress, Temperature
Proceedings Papers

Constraint Effect on Fracture in Ductile-Brittle Transition Temperature Region (Report 2)

Kiminobu Hojo, Takatoshi Hirota, Yasuto Nagoshi, Takuya Fukahori, Kimihisa Sakima, Mitsuru Ohata, Fumiyoshi Minami
Proc. ASME. PVP2022, Volume 1: Codes and Standards, V001T01A003, July 17–22, 2022
Publisher: American Society of Mechanical Engineers
Paper No: PVP2022-84186
https://doi.org/10.1115/PVP2022-84186
View Paper titled, Constraint Effect on Fracture in Ductile-Brittle Transition Temperature Region (Report 2)
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Topics: Ductile-brittle transition, Fracture (Materials), Fracture (Process), Stress, Temperature
Proceedings Papers

Fatigue Crack Growth Prediction of a Pipe With a Circumferential Surface Flaw Using Δ J and Reference Stress Method

Kiminobu Hojo, Satoshi Kumagai
Proc. ASME. PVP2022, Volume 4A: Materials and Fabrication, V04AT06A018, July 17–22, 2022
Publisher: American Society of Mechanical Engineers
Paper No: PVP2022-84555
https://doi.org/10.1115/PVP2022-84555
View Paper titled, Fatigue Crack Growth Prediction of a Pipe With a Circumferential Surface Flaw Using Δ J and Reference Stress Method
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Topics: Fatigue cracks, Pipes, Stress, Engineering standards, Computational methods, Cycles, Failure, Finite element analysis, Fitness-for-service, Fracture (Materials)
Proceedings Papers

Ductile Tearing Prediction of Ferritic Pipes by GTN Model for ATLAS+ European Project (Report 2)

Satoshi Kumagai, Kiminobu Hojo, Takatoshi Hirota, Keiji Kawanishi
Proc. ASME. PVP2022, Volume 4A: Materials and Fabrication, V04AT06A036, July 17–22, 2022
Publisher: American Society of Mechanical Engineers
Paper No: PVP2022-84554
https://doi.org/10.1115/PVP2022-84554
View Paper titled, Ductile Tearing Prediction of Ferritic Pipes by GTN Model for ATLAS+ European Project (Report 2)
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Topics: Ductile fracture, Finite element analysis, Pipes, Fracture (Materials), Coolants, Damage mechanics, Errors, Fracture mechanics, Nuclear reactors, Pressure
Proceedings Papers

Constraint Effect on Fracture in Ductile-Brittle Transition Temperature Region

Kiminobu Hojo, Takatoshi Hirota, Yasuto Nagoshi, Takuya Fukahori, Kimihisa Sakima, Mitsuru Ohata, Fumiyoshi Minami
Proc. ASME. PVP2021, Volume 1: Codes and Standards, V001T01A055, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61318
https://doi.org/10.1115/PVP2021-61318
View Paper titled, Constraint Effect on Fracture in Ductile-Brittle Transition Temperature Region
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Topics: Ductile fracture, Ductile-brittle transition, Fracture (Materials), Temperature
Proceedings Papers

Technical Basis for Revision of Code Case N-809 on Reference Fatigue Crack Growth Curves for Austenitic Stainless Steels in Pressurized Water Reactor Environments

Russell C. Cipolla, Warren H. Bamford, Kiminobu Hojo, Yuichiro Nomura
Proc. ASME. PVP2021, Volume 1: Codes and Standards, V001T01A001, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61728
https://doi.org/10.1115/PVP2021-61728
View Paper titled, Technical Basis for Revision of Code Case N-809 on Reference Fatigue Crack Growth Curves for Austenitic Stainless Steels in Pressurized Water Reactor Environments
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Topics: Fatigue cracks, Pressurized water reactors, Stainless steel
Proceedings Papers

Benchmark Analysis by Beremin Model and GTN Model in CAF Subcommittee

Takatoshi Hirota, Yasuto Nagoshi, Kiminobu Hojo, Hiroshi Okada, Akiyuki Takahashi, Jinya Katsuyama, Takashi Ueda, Takuya Ogawa, Kenji Yashirodai, Mitsuru Ohata, Fumiyoshi Minami
Proc. ASME. PVP2021, Volume 1: Codes and Standards, V001T01A056, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61668
https://doi.org/10.1115/PVP2021-61668
View Paper titled, Benchmark Analysis by Beremin Model and GTN Model in CAF Subcommittee
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Topics: Brittleness, Computer simulation, Damage, Deformation, Ductile fracture, Ductile-brittle transition, Evaluation methods, Finite element analysis, Finite element model, Flat plates
Proceedings Papers

Ductile Tearing Prediction of Ferritic Pipe Material by GTN Model for ATLAS+ European Project

Kiminobu Hojo, Takatoshi Hirota, Naoki Ogawa, Satoshi Kumagai
Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A047, August 3, 2020
Publisher: American Society of Mechanical Engineers
Paper No: PVP2020-21645
https://doi.org/10.1115/PVP2020-21645
View Paper titled, Ductile Tearing Prediction of Ferritic Pipe Material by GTN Model for ATLAS+ European Project
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Topics: Pipes, Fracture (Materials), Fracture (Process), Coolants, Ductile fracture, Fracture mechanics, Nuclear reactors, Pressure, Simulation, Stress
Proceedings Papers

Investigation of Temperature Dependence of Weibull Parameters of the Beremin Model in Ductile-Brittle Transition Temperature Region

Kiminobu Hojo, Naoki Ogawa, Kentaro Yoshimoto, Takatoshi Hirota, Yasuto Nagoshi
Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A014, August 3, 2020
Publisher: American Society of Mechanical Engineers
Paper No: PVP2020-21651
https://doi.org/10.1115/PVP2020-21651
View Paper titled, Investigation of Temperature Dependence of Weibull Parameters of the Beremin Model in Ductile-Brittle Transition Temperature Region
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Topics: Ductile-brittle transition, Temperature, Temperature effects, Alloy steel, Fracture (Materials), Fracture (Process), Brittle fracture, Carbon steel, Ductile fracture, Electromagnetic scattering
Proceedings Papers

Mode I Ductile Crack Growth of 1TC(T) Specimen Under Large Cyclic Loading: Part IV

Kiminobu Hojo
Proc. ASME. PVP2020, Volume 1: Codes and Standards, V001T01A031, August 3, 2020
Publisher: American Society of Mechanical Engineers
Paper No: PVP2020-21658
https://doi.org/10.1115/PVP2020-21658
View Paper titled, Mode I Ductile Crack Growth of 1TC(T) Specimen Under Large Cyclic Loading: Part IV
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Topics: Ductile fracture, Stress, Fitness-for-service, Fracture (Materials), Japan Society of Mechanical Engineers, Fatigue cracks, Hardening, Pipes, Computational methods, Computer simulation
Journal Articles

Special Issue: Current Trends for Pressure Vessels and Piping Technology

Akira Maekawa, Kiminobu Hojo, Marwan Hassan
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Guest Editorial
J. Pressure Vessel Technol. April 2020, 142(2): 020301.
Paper No: PVT-19-1255
https://doi.org/10.1115/1.4046178
Published Online: February 26, 2020
View Article titled, Special Issue: Current Trends for Pressure Vessels and Piping Technology
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Topics: Pipes, Pressure vessels, Engineering standards, Fracture (Process), Fluid structure interaction, Fracture (Materials), Design
Proceedings Papers

Introduction of CASS Pipe Flaw Evaluation of JSME Rules on Fitness for Service

Kiminobu Hojo
Proc. ASME. PVP2019, Volume 1: Codes and Standards, V001T01A052, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93933
https://doi.org/10.1115/PVP2019-93933
View Paper titled, Introduction of CASS Pipe Flaw Evaluation of JSME Rules on Fitness for Service
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Topics: Fitness-for-service, Japan Society of Mechanical Engineers, Pipes, Fracture (Materials), Fracture (Process), Stainless steel, Stress, Databases, Evaluation methods, Flat plates
Proceedings Papers

Mode I Ductile Crack Growth of 1TCT Specimen Under Large Cyclic Loading: Part III

Kiminobu Hojo
Proc. ASME. PVP2019, Volume 1: Codes and Standards, V001T01A028, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93476
https://doi.org/10.1115/PVP2019-93476
View Paper titled, Mode I Ductile Crack Growth of 1TCT Specimen Under Large Cyclic Loading: Part III
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Topics: Ductile fracture, Stress, Fitness-for-service, Fracture (Materials), Japan Society of Mechanical Engineers, Computational methods, Fatigue cracks, Hardening, Pipes, Piping systems
Journal Articles

Discussion: “Consideration of a Stress-Based Criterion for Local Failure and Its Implementation in a Damage Mechanics Model” (Nakamura, H., 2019, ASME J. Pressure Vessel Technol., 141 (4), p. 041405)

Kiminobu Hojo
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Discussions
J. Pressure Vessel Technol. December 2019, 141(6): 065501.
Paper No: PVT-19-1145
https://doi.org/10.1115/1.4044758
Published Online: October 9, 2019
View Article titled, Discussion: “Consideration of a Stress-Based Criterion for Local Failure and Its Implementation in a Damage Mechanics Model” (Nakamura, H., 2019, ASME J. Pressure Vessel Technol., 141 (4), p. 041405)
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Topics: Damage mechanics, Failure, Pressure vessels, Stress
Proceedings Papers

Guideline on Application Process of Techniques Developed for Repair, Replacement and Mitigation Activities

Koji Koyama, Hiroyuki Kobayashi, Kiminobu Hojo
Proc. ASME. PVP2018, Volume 1B: Codes and Standards, V01BT01A061, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-84480
https://doi.org/10.1115/PVP2018-84480
View Paper titled, Guideline on Application Process of Techniques Developed for Repair, Replacement and Mitigation Activities
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Topics: Maintenance, Nuclear power stations
Proceedings Papers

Revision to Stress Intensity Factor Equations for ASME Section XI Appendix C-4000: Determination of Failure Mode

Kiminobu Hojo, Steven Xu
Proc. ASME. PVP2018, Volume 1A: Codes and Standards, V01AT01A011, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-85051
https://doi.org/10.1115/PVP2018-85051
View Paper titled, Revision to Stress Intensity Factor Equations for ASME Section XI Appendix C-4000: Determination of Failure Mode
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Topics: Failure mechanisms, Stress, Pipes, Bending (Stress), Dimensions, Materials properties, Membranes, Shapes, Temperature
Proceedings Papers

Improvement of Target Flaw Sizes of CASS Pipe for PD Approval Using PFM Code Preface

Wataru Nishi, Takatoshi Hirota, Mayumi Ochi, Daiki Takagoshi, Kiminobu Hojo
Proc. ASME. PVP2018, Volume 1A: Codes and Standards, V01AT01A055, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-85015
https://doi.org/10.1115/PVP2018-85015
View Paper titled, Improvement of Target Flaw Sizes of CASS Pipe for PD Approval Using PFM Code Preface
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Topics: Pipes, Ferrites (Magnetic materials), Collapse, Mechanical properties, Stress, Ductile fracture, Failure mechanisms, Fracture mechanics, Nondestructive evaluation, Sensitivity analysis