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Proceedings Papers

Determination of Crack-Initiation in Fracture Toughness Testing Using an Experimental Key-Curve Methodology

S. Pothana, G. Wilkowski, S. Kalyanam, J. K. Hong, C. J. Sallaberry
Proc. ASME. PVP2021, Volume 2: Computer Technology and Bolted Joints; Design and Analysis, V002T03A046, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61812
https://doi.org/10.1115/PVP2021-61812
View Paper titled, Determination of Crack-Initiation in Fracture Toughness Testing Using an Experimental Key-Curve Methodology
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Topics: Fracture (Materials), Fracture toughness, Testing, Stress, Fittings, Instrumentation, ASTM International, Deformation, Displacement, Electric potential
Proceedings Papers

Strain Based Damage Model Predictions of Ductile Crack Growth in Multiple Fracture Specimen Geometries

S. Kalyanam, L. T. Hill, G. Wilkowski, Y. Hioe, F. W. Brust
Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A001, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61172
https://doi.org/10.1115/PVP2021-61172
View Paper titled, Strain Based Damage Model Predictions of Ductile Crack Growth in Multiple Fracture Specimen Geometries
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Topics: Damage, Ductile fracture, Fracture (Materials), Modeling, Pipes, Stress, Tension, Doors, Electric potential, Failure
Proceedings Papers

Secondary Stress Weighting Factor and Plastic Reduction Factor for Circumferential Surface Cracked Pipe and Elbow Tests at Elevated Temperature and Internal Pressure

S. Pothana, G. Wilkowski, S. Kalyanam, Y. Hioe, F. Brust, F. Orth, P. Krishnaswamy, G. Hattery, S. Burger, S. Gilbert
Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A045, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-60449
https://doi.org/10.1115/PVP2021-60449
View Paper titled, Secondary Stress Weighting Factor and Plastic Reduction Factor for Circumferential Surface Cracked Pipe and Elbow Tests at Elevated Temperature and Internal Pressure
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Topics: Pipes, Pressure, Stress, Temperature, Fracture (Materials), Rotation, Displacement, Design, Fracture toughness, Pipe sizes
Proceedings Papers

Assessment of Flaws in Non-Stress Relieved Carbon Steel Welds Caused by Hydrogen Attack

K. E. Bagnoli, Z. A. Cater-Cyker, C. A. Hay, R. L. Holloman, Y. Hioe, G. Wilkowski, B. C. Rollins, K. M. Nikbin
Proc. ASME. PVP2021, Volume 4: Materials and Fabrication, V004T06A033, July 13–15, 2021
Publisher: American Society of Mechanical Engineers
Paper No: PVP2021-61603
https://doi.org/10.1115/PVP2021-61603
View Paper titled, Assessment of Flaws in Non-Stress Relieved Carbon Steel Welds Caused by Hydrogen Attack
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Topics: Carbon steel, Hydrogen, Stress, Welded joints, Fracture (Materials), Damage, Steel, Creep, High temperature, Inspection
Journal Articles

Secondary Stress Weighting Factor and Plastic Reduction Factor of Surface Cracked Pipes Under Bending

S. Pothana, G. Wilkowski, S. Kalyanam, Y. Hioe, G. Hattery, J. Martin
Journal: Journal of Pressure Vessel Technology
Publisher: ASME
Article Type: Research-Article
J. Pressure Vessel Technol. December 2021, 143(6): 061504.
Paper No: PVT-20-1159
https://doi.org/10.1115/1.4050987
Published Online: May 31, 2021
View Article titled, Secondary Stress Weighting Factor and Plastic Reduction Factor of Surface Cracked Pipes Under Bending
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Topics: Fracture (Materials), Pipes, Stress, Rotation, Design
Proceedings Papers

Flaw Design for d-c EP Monitoring of Crack Initiation and Growth During Full-Size Pipe Experiments

J. K. Hong, M. Brongers, S. Kalyanam, Y. Hioe, G. Wilkowski, Y. Zeng, J. F. Hallai
Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A013, August 3, 2020
Publisher: American Society of Mechanical Engineers
Paper No: PVP2020-21579
https://doi.org/10.1115/PVP2020-21579
View Paper titled, Flaw Design for d-c EP Monitoring of Crack Initiation and Growth During Full-Size Pipe Experiments
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Topics: Cracking (Materials), Design, Electric potential, Fracture (Materials), Fracture (Process), Modeling, Pipes, Stress
Proceedings Papers

Investigation of Circumferential Internal Surface-Cracked Pipes and Elbows Tested at Conditions Similar to PWR and an “Apparent Net-Section-Collapse” Prediction Methodology

G. Wilkowski, S. Kalyanam, S. Burger, S. Gilbert, S. Pothana, Y. Hioe, F. W. Brust, M. Myers, P. Krishnaswamy, F. Orth, G. Hattery
Proc. ASME. PVP2020, Volume 6: Materials and Fabrication, V006T06A057, August 3, 2020
Publisher: American Society of Mechanical Engineers
Paper No: PVP2020-21532
https://doi.org/10.1115/PVP2020-21532
View Paper titled, Investigation of Circumferential Internal Surface-Cracked Pipes and Elbows Tested at Conditions Similar to PWR and an “Apparent Net-Section-Collapse” Prediction Methodology
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Topics: Collapse, Pipes, Pressurized water reactors, Stress, Fracture (Materials), Leakage, Flow (Dynamics), Surface cracks, Temperature, Bending (Stress)
Proceedings Papers

A Novel Approach to Account for Weld Residual Stresses in Pressure Vessel Flaw Assessments

F. W. Brust, L. Hill, G. Wilkowski, Y. Hioe, K. Bagnoli
Proc. ASME. PVP2019, Volume 6A: Materials and Fabrication, V06AT06A055, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-94022
https://doi.org/10.1115/PVP2019-94022
View Paper titled, A Novel Approach to Account for Weld Residual Stresses in Pressure Vessel Flaw Assessments
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Topics: Finite element analysis, Pressure vessels, Residual stresses, Stress, Fracture (Materials), Vessels, Inspection, Pressure, Approximation, Finite element methods
Proceedings Papers

Constraint Effects of Surface Crack Depth on Toughness: Experimental and Numerical Assessments

G. Wilkowski, S. Kalyanam, Y. Hioe, F. W. Brust, S. Pothana, M. Uddin, F. Orth
Proc. ASME. PVP2019, Volume 6A: Materials and Fabrication, V06AT06A014, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93713
https://doi.org/10.1115/PVP2019-93713
View Paper titled, Constraint Effects of Surface Crack Depth on Toughness: Experimental and Numerical Assessments
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Topics: Fracture toughness, Surface cracks, Fracture (Materials), Stress, Pipes, Finite element analysis, Engineering standards, Errors, Failure, Failure analysis
Proceedings Papers

Direct-Current Electric Potential (D-C EP) Technique Validation Through an Experimental and Computational Study on Pipe With Surface Crack

Y. Hioe, S. Kalyanam, G. Wilkowski, F. W. Brust, E. Punch
Proc. ASME. PVP2019, Volume 6A: Materials and Fabrication, V06AT06A017, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93771
https://doi.org/10.1115/PVP2019-93771
View Paper titled, Direct-Current Electric Potential (D-C EP) Technique Validation Through an Experimental and Computational Study on Pipe With Surface Crack
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Topics: Electric potential, Pipes, Surface cracks, Fracture (Materials), Finite element analysis, Probes, Calibration, Corners (Structural elements), Electric current, Electrical discharge machining
Proceedings Papers

Role of Constraint in Specimen Geometries When Evaluating Fracture Toughness/Material Fracture Resistance for a Surface-Flawed Elbow

S. Kalyanam, G. Wilkowski, F. W. Brust, Y. Hioe, E. Punch
Proc. ASME. PVP2019, Volume 6A: Materials and Fabrication, V06AT06A065, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93732
https://doi.org/10.1115/PVP2019-93732
View Paper titled, Role of Constraint in Specimen Geometries When Evaluating Fracture Toughness/Material Fracture Resistance for a Surface-Flawed Elbow
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Topics: Fracture (Materials), Fracture toughness, Surface cracks, Pipes, Finite element analysis, Tension, Displacement, Fatigue, Manufacturing, Pressure
Proceedings Papers

Modeling of Cracked Pipe System: Effect of Boundary Conditions on Displacement-Controlled and Load-Controlled Leak-Before-Break

M. Uddin, G. Wilkowski, E. Kurth, L. Hill, K. Bagnoli
Proc. ASME. PVP2019, Volume 6A: Materials and Fabrication, V06AT06A066, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93927
https://doi.org/10.1115/PVP2019-93927
View Paper titled, Modeling of Cracked Pipe System: Effect of Boundary Conditions on Displacement-Controlled and Load-Controlled Leak-Before-Break
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Topics: Boundary-value problems, Displacement, Leak-before-break, Modeling, Pipes, Stress, Leakage, Design, Failure, Nuclear industry
Proceedings Papers

Flaw Evaluation Procedure for Cast Austenitic Stainless Steel Materials Using a Newly Developed Statistical Thermal Aging Model

M. Uddin, C. Sallaberry, G. Wilkowski
Proc. ASME. PVP2019, Volume 1: Codes and Standards, V001T01A051, July 14–19, 2019
Publisher: American Society of Mechanical Engineers
Paper No: PVP2019-93711
https://doi.org/10.1115/PVP2019-93711
View Paper titled, Flaw Evaluation Procedure for Cast Austenitic Stainless Steel Materials Using a Newly Developed Statistical Thermal Aging Model
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Topics: Stainless steel, Fracture toughness, Pipes, Stress, Pressurized water reactors, Casting, Ferrites (Magnetic materials), Databases, Dimensions, Embrittlement
Proceedings Papers

Analysis of Full-Scale Burst Test Data by Examining Effects of Insulation and Using Fully-Instrumented Standard Pressed-Notch and Modified Backslot DWTT Specimens

M. Uddin, G. Wilkowski, C. Guan
Proc. ASME. IPC2018, Volume 3: Operations, Monitoring, and Maintenance; Materials and Joining, V003T05A015, September 24–28, 2018
Publisher: American Society of Mechanical Engineers
Paper No: IPC2018-78243
https://doi.org/10.1115/IPC2018-78243
View Paper titled, Analysis of Full-Scale Burst Test Data by Examining Effects of Insulation and Using Fully-Instrumented Standard Pressed-Notch and Modified Backslot DWTT Specimens
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Topics: Insulation, Pipes, Fracture toughness, Fracture (Materials), Soil, Ductile fracture, Steel, Testing, Clearances (Engineering), Cooling
Proceedings Papers

Next Generation Ductile Fracture Arrest Analyses for High Energy Pipelines Based on Detail Coupling of CFD and FEA Approach

K. K. Botros, E. J. Clavelle, M. Uddin, G. Wilkowski, C. Guan
Proc. ASME. IPC2018, Volume 3: Operations, Monitoring, and Maintenance; Materials and Joining, V003T05A002, September 24–28, 2018
Publisher: American Society of Mechanical Engineers
Paper No: IPC2018-78097
https://doi.org/10.1115/IPC2018-78097
View Paper titled, Next Generation Ductile Fracture Arrest Analyses for High Energy Pipelines Based on Detail Coupling of CFD and FEA Approach
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Topics: Computational fluid dynamics, Ductile fracture, Finite element analysis, Pipelines, Fracture (Materials), Fracture toughness, Pipes, Geometry, Pressure, American Petroleum Institute
Proceedings Papers

Initial Developments for LBB Application to HTHA Sensitive Non-Stress Relieved Carbon Steel Girth Welds in Refinery Plants

G. Wilkowski, Y. Hioe, E. Kurth, E. Punch, M. Uddin, F. Brust, K. Bagnoli, G. Pioszak
Proc. ASME. PVP2018, Volume 1A: Codes and Standards, V01AT01A001, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: PVP2018-84669
https://doi.org/10.1115/PVP2018-84669
View Paper titled, Initial Developments for LBB Application to HTHA Sensitive Non-Stress Relieved Carbon Steel Girth Welds in Refinery Plants
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Topics: Carbon steel, Stress, Welded joints, Hydrogen, Cracking (Materials), Fracture (Materials), Fracture (Process), Pipes, American Petroleum Institute, Methane
Proceedings Papers

“Apparent Net-Section-Collapse” Methodology for Circumferential Surface Flaws in Piping

S. Kalyanam, G. Wilkowski, S. Pothana, Y. Hioe, C. Sallaberry, J. Martin
Proc. ASME. PVP2017, Volume 6B: Materials and Fabrication, V06BT06A015, July 16–20, 2017
Publisher: American Society of Mechanical Engineers
Paper No: PVP2017-65438
https://doi.org/10.1115/PVP2017-65438
View Paper titled, “Apparent Net-Section-Collapse” Methodology for Circumferential Surface Flaws in Piping
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Topics: Collapse, Pipes, Fracture (Materials), Stress, Leakage, Surface cracks, Fracture toughness, Stainless steel, Temperature, Base metals
Proceedings Papers

Development of Secondary Stress Weighting Factor and Plastic Reduction Factor From Moment-Rotation Curves of Surface Cracked Pipe Tests

S. Pothana, G. Wilkowski, S. Kalyanam, Y. Hioe, G. Hattery, J. Martin
Proc. ASME. PVP2017, Volume 6B: Materials and Fabrication, V06BT06A027, July 16–20, 2017
Publisher: American Society of Mechanical Engineers
Paper No: PVP2017-66033
https://doi.org/10.1115/PVP2017-66033
View Paper titled, Development of Secondary Stress Weighting Factor and Plastic Reduction Factor From Moment-Rotation Curves of Surface Cracked Pipe Tests
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Topics: Pipes, Rotation, Stress, Plasticity, Fracture (Materials), Design, Fracture toughness, Stress analysis (Engineering), Displacement, Hinges
Proceedings Papers

Fracture Toughness Variation With Flaw Depth in Various Specimen Geometries and Role of Constraint in Material Fracture Resistance

Y. Hioe, S. Kalyanam, G. Wilkowski, S. Pothana, J. Martin
Proc. ASME. PVP2017, Volume 6A: Materials and Fabrication, V06AT06A032, July 16–20, 2017
Publisher: American Society of Mechanical Engineers
Paper No: PVP2017-65441
https://doi.org/10.1115/PVP2017-65441
View Paper titled, Fracture Toughness Variation With Flaw Depth in Various Specimen Geometries and Role of Constraint in Material Fracture Resistance
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Topics: Fracture (Materials), Fracture toughness, Pipes, Surface cracks, Stress, Collapse, Displacement, Failure mechanisms, Flat plates, Fracture mechanics
Proceedings Papers

Validation of Axial Crack Stability Assessment Methods in xLPR Version 2.0 Code

S. Kalyanam, F. W. Brust, G. Wilkowski, D. J. Shim, D. Rudland
Proc. ASME. PVP2016, Volume 6A: Materials and Fabrication, V06AT06A028, July 17–21, 2016
Publisher: American Society of Mechanical Engineers
Paper No: PVP2016-63830
https://doi.org/10.1115/PVP2016-63830
View Paper titled, Validation of Axial Crack Stability Assessment Methods in xLPR Version 2.0 Code
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Topics: Fracture (Materials), Stability, Stress, Pipes, Fracture mechanics, American Petroleum Institute, Collapse, Dimensions, Ductile fracture, Fitness-for-service