Iiw Recommendations For The Fatigue Assessment Of Welded Structures By Notch Stress Analysis
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Iiw Recommendations For The Fatigue Assessment Of Welded Structures By Notch Stress Analysis
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Author : W Fricke
language : en
Publisher: Woodhead Publishing
Release Date : 2012-10-22
Iiw Recommendations For The Fatigue Assessment Of Welded Structures By Notch Stress Analysis written by W Fricke and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-10-22 with Technology & Engineering categories.
The notch stress approach for fatigue assessment of welded joints is based on the highest elastic stress at the weld toe or root. In order to avoid arbitrary or infinite stress results, a rounded shape with a reference radius instead of the actual sharp toe or root is usually assumed. IIW recommendations for the fatigue assessment of welded structures by notch stress analysis reviews different proposals for reference radii together with associated S-N curves. Detailed recommendations are given for the numerical analysis of notch stress by the finite or boundary element method. Several aspects are discussed, such as the structural weakening by keyhole-shaped notches and the consideration of multiaxial stress states. Appropriate S-N curves are presented for the assessment of the fatigue strength of different materials. Finally, four examples illustrate the application of the approach as well as the variety of structures which can be analysed and the range of results that can be obtained from different models. Provides detailed recommendations for the number analysis of notch stress by the finite or boundary element method Discusses structural weakening by keyhole-shaped notches and the consideration of multiaxial stress states Provides four comprehensive examples, illustrating the variety of structures which can be analysed and the range of results that can be obtained from different models
Iiw Guidelines On Weld Quality In Relationship To Fatigue Strength
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Author : Bertil Jonsson
language : en
Publisher: Springer
Release Date : 2016-04-13
Iiw Guidelines On Weld Quality In Relationship To Fatigue Strength written by Bertil Jonsson and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-13 with Technology & Engineering categories.
This book presents guidelines on quantitative and qualitative measures of the geometric features and imperfections of welds to ensure that it meets the fatigue strength requirements laid out in the recommendations of the IIW (International Institute of Welding). Welds that satisfy these quality criteria can be assessed in accordance with existing IIW recommendations based on nominal stress, structural stress, notch stress or linear fracture mechanics. Further, the book defines more restrictive acceptance criteria based on weld geometry features and imperfections with increased fatigue strength. Fatigue strength for these welds is defined as S-N curves expressed in terms of nominal applied stress or hot spot stress. Where appropriate, reference is made to existing quality systems for welds.In addition to the acceptance criteria and fatigue assessment curves, the book also provides guidance on their inspection and quality control. The successful implementation of these methods depends on adequate training for operators and inspectors alike. As such, the publication of the present IIW Recommendations is intended to encourage the production of appropriate training aids and guidelines for educating, training and certifying operators and inspectors.
Recommendations For Fatigue Design Of Welded Joints And Components
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Author : A. F. Hobbacher
language : en
Publisher: Springer
Release Date : 2015-12-23
Recommendations For Fatigue Design Of Welded Joints And Components written by A. F. Hobbacher and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-23 with Technology & Engineering categories.
This book provides a basis for the design and analysis of welded components that are subjected to fluctuating forces, to avoid failure by fatigue. It is also a valuable resource for those on boards or commissions who are establishing fatigue design codes. For maximum benefit, readers should already have a working knowledge of the basics of fatigue and fracture mechanics. The purpose of designing a structure taking into consideration the limit state for fatigue damage is to ensure that the performance is satisfactory during the design life and that the survival probability is acceptable. The latter is achieved by the use of appropriate partial safety factors. This document has been prepared as the result of an initiative by Commissions XIII and XV of the International Institute of Welding (IIW).
Fatigue Assessment Of Welded Joints By Local Approaches
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Author : Dieter Radaj
language : en
Publisher: Woodhead Publishing
Release Date : 2006-10-30
Fatigue Assessment Of Welded Joints By Local Approaches written by Dieter Radaj and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-10-30 with Technology & Engineering categories.
Local approaches to fatigue assessment are used to predict the structural durability of welded joints, to optimise their design and to evaluate unforeseen joint failures. This standard work provides a systematic survey of the principles and practical applications of the various methods. It covers the hot spot structural stress approach to fatigue in general, the notch stress and notch strain approach to crack initiation and the fracture mechanics approach to crack propagation. Seam-welded and spot-welded joints in structural steels and aluminium alloys are also considered. This completely reworked second edition takes into account the tremendous progress in understanding and applying local approaches which has been achieved in the last decade. It is a standard reference for designers, structural analysts and testing engineers who are responsible for the fatigue-resistant in-service behaviour of welded structures. Completely reworked second edition of a standard work providing a systematic survey of the principles and practical applications of the various methods Covers the hot spot structural stress approach to fatigue in general, the notch stress and notch strain approach to crack initiation and the fracture mechanics approach to crack propagation. Written by a distinguished team of authors
Fatigue Analysis Of Welded Components
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Author : E. Niemi
language : en
Publisher: Woodhead Publishing
Release Date : 2006-09-27
Fatigue Analysis Of Welded Components written by E. Niemi and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-09-27 with Technology & Engineering categories.
This report provides background and guidance on the use of the structural hot spot stress approach to the fatigue design of welded components and structures. It complements the IIW recommendations for 'Fatigue Design of Welded Joints and Components' and extends the information provided in the IIW recommendations on 'Stress Determination for Fatigue Analysis of Welded Components'. This approach is applicable to cases of potential fatigue cracking from the weld toe. It has been in use for many years in the context of tubular joints. The present report concentrates on its extension to structures fabricated from plates and non-tubular sections. Following an explanation of the structural hot spot stress, its definition and its relevance to fatigue, the authors describe methods for its determination. Stress determination from both finite element analysis and strain gauge measurements is considered. Parametric formulae for calculating stress increases due to misalignment and structural discontinuities are also presented. Special attention is paid to the use of finite element stress analysis and guidance is given on the choice of element type and size for use with either solid or shell elements. Design S-N curves for use with the structural hot spot stress are presented for a range of weld details. Finally, practical application of the recommendations is illustrated in two case studies involving the fatigue assessment of welded structures using the structural hot spot stress approach. Provides practical guidance on the application of the structural hot-spot stress approach Discusses stress determination from both finite element analysis and strain gauge measurements Practical application of the recommendations is illustrated in two case studies
Fatigue Assessment Of Welded Joints By Local Approaches
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Author : Dieter Radaj
language : en
Publisher: Woodhead Publishing
Release Date : 1998
Fatigue Assessment Of Welded Joints By Local Approaches written by Dieter Radaj and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Technology & Engineering categories.
Structural Hot Spot Stress Approach To Fatigue Analysis Of Welded Components
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Author : Erkki Niemi
language : en
Publisher: Springer
Release Date : 2017-08-28
Structural Hot Spot Stress Approach To Fatigue Analysis Of Welded Components written by Erkki Niemi and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-28 with Technology & Engineering categories.
This book provides background and guidance on the use of the structural hot-spot stress approach to fatigue analysis. The book also offers Design S-N curves for use with the structural hot-spot stress for a range of weld details, and presents parametric formulas for calculating stress increases due to misalignment and structural discontinuities. Highlighting the extension to structures fabricated from plates and non-tubular sections. The structural hot-spot stress approach focuses on cases of potential fatigue cracking from the weld toe and it has been in use for many years in tubular joints. Following an explanation of the structural hot-spot stress, its definition and its relevance to fatigue, the book describes methods for its determination. It considers stress determination from both finite element analysis and strain gauge measurements, and emphasizes the use of finite element stress analysis, providing guidance on the choice of element type and size for use with either solid or shell elements. Lastly, it illustrates the use of the recommendations in four case studies involving the fatigue assessment of welded structures using the structural hot-spot stress
Iiw Recommendations On Methods For Improving The Fatigue Strength Of Welded Joints
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Author : P J Haagensen
language : en
Publisher: Woodhead Publishing
Release Date : 2013-01-25
Iiw Recommendations On Methods For Improving The Fatigue Strength Of Welded Joints written by P J Haagensen and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-01-25 with Technology & Engineering categories.
The weld toe is a primary source of fatigue cracking because of the severity of the stress concentration it produces. Weld toe improvement can increase the fatigue strength of new structures significantly. It can also be used to repair or upgrade existing structures. However, in practice there have been wide variations in the actual improvements in fatigue strength achieved. Based on an extensive testing programme organised by the IIW, this report reviews the main methods for weld toe improvement to increase fatigue strength: burr grinding, TIG dressing and hammer and needle peening. The report provides specifications for the practical use of each method, including equipment, weld preparation and operation. It also offers guidance on inspection, quality control and training as well as assessments of fatigue strength and thickness effects possible with each technique. IIW recommendations on methods for improving the fatigue strength of welded joints will allow a more consistent use of these methods and more predictable increases in fatigue strength. Provides specifications for the practical use of each weld toe method, including equipment, weld preparation and operation Offers guidance on inspection, quality control and training, as well as assessments of fatigue strength and thickness effects possible with each technique This report will allow a more consistent use of these methods and more predictable increases in fatigue strength
Iiw Recommendations For The Hfmi Treatment
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Author : Gary B. Marquis
language : en
Publisher: Springer
Release Date : 2016-09-29
Iiw Recommendations For The Hfmi Treatment written by Gary B. Marquis and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-29 with Technology & Engineering categories.
This book of recommendations presents an overview of High Frequency Mechanical Impact (HFMI) techniques existing today in the market and their proper procedures, quality assurance measures and documentation. Due to differences in HFMI tools and the wide variety of potential applications, certain details of proper treatments and quantitative quality control measures are presented generally. An example of procedure specification as a quality assurance measure is given in the Appendix. Moreover, the book presents procedures for the fatigue life assessment of HFMI-improved welded joints based on nominal stress, structural hot spot stress and effective notch stress. It also considers the extra benefit that has been experimentally observed for HFMI-treated high-strength steels. The recommendations offer proposals on the effect of loading conditions like high mean stress fatigue cycles, variable amplitude loading and large amplitude/low cycle fatigue cycles. Special considerations for low stress concentration welded joints are also given. In order to demonstrate the use of the guideline, the book provides several fatigue assessment examples.
Design And Analysis Of Fatigue Resistant Welded Structures
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Author : Dieter Radaj
language : en
Publisher: Woodhead Publishing
Release Date : 1990-01-03
Design And Analysis Of Fatigue Resistant Welded Structures written by Dieter Radaj and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990-01-03 with Medical categories.
An English version of a sucessful German book. Both traditional and modern concepts are described.