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Masahito Mochizuki
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Journal Articles

Diagnosis of Mechanical Properties with Instrumented Indentation Technique Using Multiple Pyramid Indenters

Shigetaka Okano, Masahito Mochizuki
Journal: Materials Performance and Characterization
Publisher: ASTM International
Article Type: Technical Papers
Matls. Perf. Charact.. August 2021, 10(1): 769–781.
Paper No: MPC20210044
https://doi.org/10.1520/MPC20210044
Published Online: November 22, 2021
View Article titled, Diagnosis of Mechanical Properties with Instrumented Indentation Technique Using Multiple Pyramid Indenters
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Proceedings Papers

Assessment of Residual Stress for Thick Butt-Welded Plate of a Reactor Pressure Vessel Steel

Yoosung Ha, Shigetaka Okano, Hisashi Takamizawa, Jinya Katsuyama, Masahito Mochizuki
Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A067, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61897
https://doi.org/10.1115/PVP2021-61897
View Paper titled, Assessment of Residual Stress for Thick Butt-Welded Plate of a Reactor Pressure Vessel Steel
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Topics: Drilling, Finite element analysis, Reactor vessels, Steel, Stress
Journal Articles

Coupling Computation between Weld Mechanics and Arc Plasma Process for Residual Stress Analysis

Shigetaka Okano, Hitoshi Tsuji, Ryohei Ihara, Masahito Mochizuki
Journal: Materials Performance and Characterization
Publisher: ASTM International
Article Type: Technical Papers
Matls. Perf. Charact.. October 2018, 7(4): 559–573.
Paper No: MPC20170089
https://doi.org/10.1520/MPC20170089
Published Online: October 3, 2018
View Article titled, Coupling Computation between Weld Mechanics and Arc Plasma Process for Residual Stress Analysis
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Journal Articles

Estimation of Stress Corrosion Cracking Growth Behavior Under Weld Residual Stress in the Bottom of a Reactor Pressure Vessel by Finite Element Analysis

Fuminori Iwamatsu, Katsumasa Miyazaki, Masahito Mochizuki
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. August 2015, 137(4): 041402.
Paper No: PVT-13-1073
https://doi.org/10.1115/1.4029256
Published Online: August 1, 2015
View Article titled, Estimation of Stress Corrosion Cracking Growth Behavior Under Weld Residual Stress in the Bottom of a Reactor Pressure Vessel by Finite Element Analysis
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Topics: Finite element analysis, Fracture (Materials), Stress, Shapes, Stress concentration
Proceedings Papers

Effect of Seal Welding Conditions on Residual Stress Field and Fracture Mechanics Parameter Around Remaining Crack

Masahito Mochizuki, Shigetaka Okano, Keisuke Torigata
Proc. ASME. PVP2013, Volume 6A: Materials and Fabrication, V06AT06A022, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-98069
https://doi.org/10.1115/PVP2013-98069
View Paper titled, Effect of Seal Welding Conditions on Residual Stress Field and Fracture Mechanics Parameter Around Remaining Crack
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Topics: Fracture (Materials), Fracture mechanics, Stress, Welding, Heat, Welded joints, Finite element analysis, Heat conduction, Reliability, Temperature distribution
Proceedings Papers

Probabilistic Study of SCC Initiation Stage Based on Statistical Analysis in 316L Austenitic Stainless Steel

Ryohei Ihara, Masahito Mochizuki, Shinji Fujimoto
Proc. ASME. PVP2013, Volume 6A: Materials and Fabrication, V06AT06A024, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-98155
https://doi.org/10.1115/PVP2013-98155
View Paper titled, Probabilistic Study of SCC Initiation Stage Based on Statistical Analysis in 316L Austenitic Stainless Steel
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Topics: Stainless steel, Statistical analysis, Fracture (Materials), Density, Probability, Boiling water reactors, Microcracks, Nuclear power stations, Corrosion, Metals
Proceedings Papers

SCC Assessment Based on Probability Fracture Mechanics Considering SCC Initiation and Propagation Under Residual Stress Fields Generated by Machining and Welding Process of Pipes

Masahito Mochizuki, Ryohei Ihara, Jinya Katsuyama, Makoto Udagawa
Proc. ASME. PVP2013, Volume 6A: Materials and Fabrication, V06AT06A025, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-98156
https://doi.org/10.1115/PVP2013-98156
View Paper titled, SCC Assessment Based on Probability Fracture Mechanics Considering SCC Initiation and Propagation Under Residual Stress Fields Generated by Machining and Welding Process of Pipes
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Topics: Fracture mechanics, Machining, Pipes, Probability, Stress, Welding, Butt welding, Stress concentration, Fracture (Materials), Finite element methods
Proceedings Papers

Mitigation of Welding-Induced Tensile Residual Stress at Surface of Heavy Section Plate by In-Process Control Welding With Trailing Heat Sink

Shigetaka Okano, Masahito Mochizuki
Proc. ASME. PVP2013, Volume 6B: Materials and Fabrication, V06BT06A090, July 14–18, 2013
Publisher: American Society of Mechanical Engineers
Paper No: PVP2013-98071
https://doi.org/10.1115/PVP2013-98071
View Paper titled, Mitigation of Welding-Induced Tensile Residual Stress at Surface of Heavy Section Plate by In-Process Control Welding With Trailing Heat Sink
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Topics: Heat sinks, Stress, Welding, Simulation results, Carbon, Finite element analysis, Stainless steel, Temperature, X-rays
Proceedings Papers

Effect of Weld HAZ Mis-Matching on Joint Performances in High Chromium Steel Welded Joint

Masahito Mochizuki
Proc. ASME. ICONE20-POWER2012, Volume 1: Plant Operations, Maintenance, Engineering, Modifications, Life Cycle, and Balance of Plant; Component Reliability and Materials Issues; Steam Generator Technology Applications and Innovations; Advanced Reactors and Near-Term Deployment; Reactor Physics, Neutronics, and Transport Theory; Nuclear Education, Human Resources, and Public Acceptance, 457-466, July 30–August 3, 2012
Publisher: American Society of Mechanical Engineers
Paper No: ICONE20-POWER2012-54699
https://doi.org/10.1115/ICONE20-POWER2012-54699
View Paper titled, Effect of Weld HAZ Mis-Matching on Joint Performances in High Chromium Steel Welded Joint
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Topics: Steel, Welded joints, Tensile strength, Piping systems, Stainless steel, Welding, Base metals, Breeder reactors, Coolants, Design
Proceedings Papers

Improvement of Residual Stress Determination by Deep Hole Drilling Considering Plastic Deformation

Masahito Mochizuki, Houichi Kitano, Shigetaka Okano
Proc. ASME. PVP2012, Volume 6: Materials and Fabrication, Parts A and B, 1281-1285, July 15–19, 2012
Publisher: American Society of Mechanical Engineers
Paper No: PVP2012-78812
https://doi.org/10.1115/PVP2012-78812
View Paper titled, Improvement of Residual Stress Determination by Deep Hole Drilling Considering Plastic Deformation
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Topics: Deformation, Drilling, Stress, Residual stresses, Finite element analysis
Proceedings Papers

Estimation of SCC Crack Growth Behavior Under Weld Residual Stress in the Bottom of a Reactor Pressure Vessel by Finite Element Analysis

Fuminori Iwamatsu, Katsumasa Miyazaki, Masahito Mochizuki
Proc. ASME. PVP2012, Volume 6: Materials and Fabrication, Parts A and B, 703-709, July 15–19, 2012
Publisher: American Society of Mechanical Engineers
Paper No: PVP2012-78471
https://doi.org/10.1115/PVP2012-78471
View Paper titled, Estimation of SCC Crack Growth Behavior Under Weld Residual Stress in the Bottom of a Reactor Pressure Vessel by Finite Element Analysis
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Topics: Finite element analysis, Fracture (Materials), Reactor vessels, Stress, Shapes, Modeling, Crack propagation, Metals, Stress concentration, Stress corrosion cracking
Proceedings Papers

Effect of Undermatched Weld on Deformation and Brittle Fracture Behaviors in High-Tensile Strength Steel Plate Welded Joint

Masahito Mochizuki, Tomoya Kawabata
Proc. ASME. PVP2012, Volume 6: Materials and Fabrication, Parts A and B, 145-154, July 15–19, 2012
Publisher: American Society of Mechanical Engineers
Paper No: PVP2012-78813
https://doi.org/10.1115/PVP2012-78813
View Paper titled, Effect of Undermatched Weld on Deformation and Brittle Fracture Behaviors in High-Tensile Strength Steel Plate Welded Joint
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Topics: Brittle fracture, Deformation, Steel, Welded joints, Welding, Phase transitions, Cooling, Hydroelectric power stations, Stress, Temperature
Journal Articles

Long-Term Stability of Residual Stress Improvement by Water Jet Peening Considering Working Processes

Tadafumi Hashimoto, Yusuke Osawa, Shinsuke Itoh, Masahito Mochizuki, Kazutoshi Nishimoto
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. June 2013, 135(3): 031601.
Paper No: PVT-11-1188
https://doi.org/10.1115/1.4023417
Published Online: May 21, 2013
View Article titled, Long-Term Stability of Residual Stress Improvement by Water Jet Peening Considering Working Processes
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Topics: Stress, Stability, Water, Creep, Relaxation (Physics), X-rays, Shot peening
Proceedings Papers

Residual Stress by X-Ray Diffraction and Microstructure for Multi-Pass Girth Welded Pipe Joint in Austenitic Stainless Steel Type 316L

Tadafumi Hashimoto, Shigetaka Okano, Shinro Hirano, Masahito Mochizuki, Kazutoshi Nishimoto
Proc. ASME. PVP2011, Volume 6: Materials and Fabrication, Parts A and B, 1479-1488, July 17–21, 2011
Publisher: American Society of Mechanical Engineers
Paper No: PVP2011-57434
https://doi.org/10.1115/PVP2011-57434
View Paper titled, Residual Stress by X-Ray Diffraction and Microstructure for Multi-Pass Girth Welded Pipe Joint in Austenitic Stainless Steel Type 316L
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Topics: Pipe joints, Stainless steel, Stress, X-ray diffraction, Welding, Ferrites (Magnetic materials), Brittle fracture, Crack propagation, Cycles, Fatigue failure
Proceedings Papers

Long Term Stability of Compressive Residual Stress Introduced in Alloy 600 by Water Jet Peening Under Elevated Temperature Environment

Tadafumi Hashimoto, Yusuke Osawa, Masashi Kameyama, Shinro Hirano, Naoki Chigusa, Kazuyoshi Saida, Masahito Mochizuki, Kazutoshi Nishimoto
Proc. ASME. PVP2011, Volume 6: Materials and Fabrication, Parts A and B, 605-612, July 17–21, 2011
Publisher: American Society of Mechanical Engineers
Paper No: PVP2011-57091
https://doi.org/10.1115/PVP2011-57091
View Paper titled, Long Term Stability of Compressive Residual Stress Introduced in Alloy 600 by Water Jet Peening Under Elevated Temperature Environment
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Topics: Indium alloys, Shot peening, Stability, Stress, Temperature, Water, Pressurized water reactors, Deformation, Machining, Relaxation (Physics)
Proceedings Papers

Deformation State Evaluation Around Deep Drilled Hole After Three-Dimensional Stress Release

Houichi Kitano, Shigetaka Okano, Masahito Mochizuki
Proc. ASME. PVP2011, Volume 6: Materials and Fabrication, Parts A and B, 1429-1436, July 17–21, 2011
Publisher: American Society of Mechanical Engineers
Paper No: PVP2011-57193
https://doi.org/10.1115/PVP2011-57193
View Paper titled, Deformation State Evaluation Around Deep Drilled Hole After Three-Dimensional Stress Release
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Topics: Deformation, Stress, Residual stresses, Shear stress, Cutting, Drilling, Numerical analysis, Theoretical methods
Journal Articles

Prediction of Ductile-to-Brittle Transition Under Different Strain Rates in Undermatched Welded Joints

Masahito Mochizuki, Masao Toyoda
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research Papers
J. Pressure Vessel Technol. June 2011, 133(3): 031401.
https://doi.org/10.1115/1.4002670
Published Online: March 29, 2011
View Article titled, Prediction of Ductile-to-Brittle Transition Under Different Strain Rates in Undermatched Welded Joints
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Topics: Brittle fracture, Brittleness, Deformation, Ductile fracture, Dynamic testing (Materials), Fracture (Materials), Fracture (Process), Fracture toughness, Numerical analysis, Stress
Journal Articles

The Effects of Residual Stress Distribution and Component Geometry on the Stress Intensity Factor of Surface Cracks

Katsumasa Miyazaki, Masahito Mochizuki
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research Papers
J. Pressure Vessel Technol. February 2011, 133(1): 011701.
https://doi.org/10.1115/1.4002671
Published Online: January 20, 2011
View Article titled, The Effects of Residual Stress Distribution and Component Geometry on the Stress Intensity Factor of Surface Cracks
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Topics: Fracture (Materials), Stress, Surface cracks, Geometry, Pipes, Tension, Compression
Proceedings Papers

Prediction of SCC Initiation in Weld Components by Multi-Scale Analysis Incorporating Crystal Plasticity

Masahito Mochizuki, Yoshiki Mikami
Proc. ASME. PVP2010, ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B, 189-195, July 18–22, 2010
Publisher: American Society of Mechanical Engineers
Paper No: PVP2010-25899
https://doi.org/10.1115/PVP2010-25899
View Paper titled, Prediction of SCC Initiation in Weld Components by Multi-Scale Analysis Incorporating Crystal Plasticity
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Topics: Crystals, Plasticity, Stress, Stress concentration, Crystal structure, Fracture (Materials), Grain boundaries, Stress corrosion cracking, Temperature, Alloys
Proceedings Papers

Coupling Computation Between Weld Mechanics and Arc Plasma Processes

Masahito Mochizuki, Shigetaka Okano
Proc. ASME. PVP2010, ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B, 1449-1460, July 18–22, 2010
Publisher: American Society of Mechanical Engineers
Paper No: PVP2010-25901
https://doi.org/10.1115/PVP2010-25901
View Paper titled, Coupling Computation Between Weld Mechanics and Arc Plasma Processes
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Topics: Computation, Electric arcs, Temperature distribution, Welding, Deformation, Heat transfer, Modeling, Numerical analysis, Simulation, Stress analysis (Engineering)