NDLI: Limit Load Solution of Non-Aligned Multiple Flaws

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Volume 1B: Codes and Standards

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

New Fatigue Screening Criteria for the Fitness-for-Service Assessment of In-Service Process Piping Vibrations

A Residual Stress Profile Estimation Method for Narrow Groove Girth Welds

A Comprehensive Structural Strain Method Incorporating Strain-Hardening Effects: From LCF to Ratcheting Evaluations

Stress Intensity Factor Coefficients for Circumferential OD Surface Flaws in Cylinders for Appendix A of ASME Section XI

Fatigue Crack Growth in Low Alloy Steels Under Tension-Compression Loading in Air

Three Approaches to Quantification of NDE Uncertainty and a Detailed Exposition of the Expert Panel Approach Using the Sheffield Elicitation Framework

Limit Load Solution of Non-Aligned Multiple Flaws

Definition of Fatigue Crack Growth Thresholds for Ferritic Steels in Fitness-for-Service Codes

Fatigue Crack Growth for Ferritic Steel Under Negative Stress Ratio

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

Investigation of Calculating Stress Intensity Factor at Surface Point and its Inclusion in Engineering Standards

INCEFA-PLUS: Increasing Safety in NPPs by Covering Gaps in Environmental Fatigue Assessment

Ensuring Data Quality for Environmental Fatigue: INCEFA-PLUS Testing Procedure and Data Evaluation

Low Cycle Fatigue (EAF) of AISI 304L and 347 in PWR Water

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Effect of Surface Condition on the Fatigue Life of Austenitic Stainless Steels in High Temperature Water Environments

Negative R Fatigue Crack Growth Rate Testing on Austenitic Stainless Steel in Air and Simulated Primary Water Environments

Environmental Assisted Fatigue and EDF 900 MWe PWRs Fleet: Towards an Exemption of Environmental Effects Consideration for Secondary Circuit Components

ASME Section XI Appendix L Flaw Tolerance Evaluation of Pressurized Water Reactor Piping Systems to Support Second License Renewal (80-Years Operation)

Influence of Mean Strain on Fatigue Life of Stainless Steel in PWR Water Environment

Study on the Influence of Strain Rate on Crack Initiation and Growth in Simulated Reactor Coolant Environment of Type 316 Stainless Steel

Creep-Fatigue Damage Evaluation of Grade 91 Steel Using Interrupt Creep Fatigue Test

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Numerical Study on Longitudinal Distance Effect on Failure Stress of Non-Aligned Twin Cracked Pipe

Prediction for Plastic Collapse Stresses for Pipes With Inner and Outer Circumferential Flaws

Alternative Characterization Rules for Multiple Surface Planar Flaws

Tensile Tests for Cast Stainless Steel: Evolution of the RCC-M Code

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

Evaluation of Reactor Internals Integrity and Lifetime According to the NTD ASI

Fracture Analysis of Ductile-Brittle Transition Temperature Region Considering Specimens With Different Constraints

Analysis of a Weld Overlay to Address Fatigue Cracking in a Stainless Steel Nozzle

Reactor Vessel Nozzle Inner Radius Fracture Analyses Using Elastic-Plastic Fracture Mechanics

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2018 RCC-MRx Code Edition: Context, Overview, On-Going Developments

A Perspective of the Small Punch Test Application to the Evaluation of Hydrogen Embrittlement in Steels: Effect of Punch Rate on Fracture Properties

Interlaboratory Study for Small Punch Testing Preliminary Results

Estimation of the Reference Temperature, T0, by Means of the Small Punch Testing Technique

Assessment of Master Curve Material Inhomogeneity Using Small Data Sets

Fracture Toughness Evaluation of Heat-Affected Zone Under Weld Overlay Cladding in Reactor Pressure Vessel Steel

Crack Resistance Curve Measurement With Miniaturized CT Specimen

Master Curve Testing on Reconstituted Surveillance Charpy Specimens

Use of Mini-CT Specimens for Fracture Toughness Characterization of Low Upper-Shelf Linde 80 Weld Before and After Irradiation

Evaluation of Through Wall Fracture Toughness Distribution of IAEA Reference Material JRQ by Mini-C(T) Specimens and the Master Curve Method

Trial Study of the Master Curve Fracture Toughness Evaluation by Mini-C(T) Specimens for Low Upper Shelf Weld Metal Linde-80

Inter-Laboratory Results and Analyses of Mini-C(T) Specimen Testing of an Irradiated Linde 80 Weld Metal

Fracture Toughness Characterization of Low Upper-Shelf Linde 80 Weld Using Mini-C(T) Specimens

Study on Applicability of Master Curve Methodology Using Miniature C(T) Specimen to a Reactor Pressure Vessel With Low Upper Shelf Energy

Master Curve Fracture Toughness Characterization of Eurofer97 Using Miniature Multi-Notch Bend Bar Specimens for Fusion Applications

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Limit Load Solution of Non-Aligned Multiple Flaws

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Iwamatsu, Fuminori Miyazaki, Katsumasa Saito, Koichi
Copyright Year	2018
Abstract	Limit load solutions have been applied to estimate the collapse load of a component made of ductile material. Worldwide maintenance codes for power plants, such as ASME Boiler and Pressure Vessels Code, Section XI, and JSME fitness-for-service code, describe limit load solutions under the assumption of a single flaw. Detected flaws are, however, not always a single flaw, and adjacent flaws due to stress corrosion cracking have been detected in power plants. Thus, development of a limit load solution to estimate the collapse load in the case of multiple flaws remains an issue of structural integrity evaluation. Under the aim of developing a method for evaluating the effect of multiple flaws on collapse load as a part of a limit load solution, fracture tests of flat plates and pipes with multiple flaws were conducted. Although experimental approaches have been attempted to establish the evaluation method, further efforts are required to incorporate the evaluation procedure into a code rule. Effective parameters for considering reduction of collapse load on the basis of test results for specimens with multiple flaws were identified. Test results clearly show a correlation between collapse load and ratios of net-section areas. This correlation leads to the conclusion that distance parameters and flaw length of a smaller flaw determine the existence of an effect on the collapse load by multiple flaws. To investigate the physical sense of the correlation, finite element analysis (FEA) was performed. The FEA results show that strain distributions at the flaw tip under several conditions correspond at the time of maximum load of the fracture tests regardless of the effect of multiple flaws. Also according to the FEA results, the extent of the strain field is linearly proportional to flaw length. These FEA results are consistent with the correlation obtained by the test results.
Sponsorship	Pressure Vessels and Piping Division
File Format	PDF
ISBN	9780791851586
DOI	10.1115/PVP2018-84809
Volume Number	Volume 1A: Codes and Standards
Conference Proceedings	ASME 2018 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2018-07-15
Publisher Place	Prague, Czech Republic
Access Restriction	Subscribed
Subject Keyword	Collapse Japan society of mechanical engineers Flat plates Fitness-for-service Boilers Fracture (materials) Maintenance Stress corrosion cracking Stress Experimental methods Fracture (process) Evaluation methods Pressure vessels Power stations Finite element analysis Pipes
Content Type	Text
Resource Type	Article

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