IIW 2012 - 20
Commemorative Magazine
IIW International Conference 2012 - Abstracts
IIW International Conference 2012:
Welding for Repair and Life Extension of Plants and Infrastructure
Opening Session Houdremont Lecture: Welding and Materials Considerations for Repair and Life Extension
By: Dr. Carl D. Lundin, University of Tennessee, USA Houdremont Lecture Abstract: Repair of pressure vessels and structures for life extension must be undertaken with detailed and specific knowledge of the metallurgical condition of the pressure vessel or structure. Thus, a complete assessment of the existing structures must be undertaken before any repair or replacement decisions can be made. The information obtained from the material condition assessment is the first step leading to decisions as to which components can be repaired and which must be replaced. Only with this information at hand can the economic considerations related to enhanced lifetime and any potential operational limitation aspects of the equipment be addressed. In order to best assess and define the avenues required for optimum use of the existing structural components and which materials should and can be repaired or must be replaced, a full failure analysis or the determination of the material degradation mode must be carried out. This lecture will present several examples of successful life extensions involving structural, pressure vessel and piping applications for which a dedicated condition assessment was conducted before a successful refurbishment, within the economic constraints, was conducted. Abstract : This paper is aimed at looking at analysis methods for remaining life assessment of components, containing cracks in welds, at elevated temperatures. The methodologies presented are appropriate for testing welded specimens, remaining life assessment of welded components, as well as for their design. Guidelines for assessing the structural design, relevant failure criteria under creep and fatigue, and the significance of defects in welded components are discussed. The procedures will need to contain methodology for dealing with failure by net section rupture, incremental crack growth or some combination of both processes. The influence of creep and fatigue and the onset of brittle or ductile fracture in determining tolerable defect size need to be considered. For testing procedures of welded specimens, information will include methods for specifying loading conditions under normal and abnormal operating conditions and methods for characterizing defects in welds. The calculations of the parameters to describe cracking rates in welds will make use of limit analysis methods and fracture mechanics concepts. Several levels of complexity need to be discussed depending on the criticality of the problem and the materials properties data available. Approximations will be presented for dealing with cracked components when only some data are available. In essence, various means of analysis and detailed advice should be available to the user in a life assessment document to deal with the problem irrespective of the amount of data available. The level of safety factors used will need to be determined from available data and its extent of scatter. The defect assessment procedure presented may be applied to welded components containing planar defects, including cracking or lack of fusion. It may be applied, subject to restrictions, to defects, which are actually discovered during pre-service or in-service inspection (where possible). The objective is to decide whether the defect is innocuous and will never affect the integrity of the struc20 65TH IIW Annual Assembly & International Conference
Plenary Session 1 Design and Risk Assessment for Repair:
Paper 1: Fracture Mechanics Based Life Assessment Procedures for Weldments Containing esidual Stresses
By: K. Nikbin, Imperial College London, UK
IIW 2012
Table of Contents for the Digital Edition of IIW 2012
IIW 2012
Contents
Welcome Message
Annual Assembly Location
Colorado
Denver
General Information
IIW 65th Annual Assembly
IIW International Conference 2012 - Program
IIW International Conference 2012 - Abstracts
Speaker Bio Information
Smartphone App
Social Program
Technical Visits
Social Tours
Tour Schedule
Advertising Sponsor Profiles
Commission XIII Fracture Mechanics Seminar
IIW 2012 Sponsors
IIW 2012 - IIW 2012
IIW 2012 - Cover2
IIW 2012 - Contents
IIW 2012 - Welcome Message
IIW 2012 - 3
IIW 2012 - Annual Assembly Location
IIW 2012 - 5
IIW 2012 - Colorado
IIW 2012 - 7
IIW 2012 - Denver
IIW 2012 - 9
IIW 2012 - General Information
IIW 2012 - 11
IIW 2012 - 12
IIW 2012 - IIW 65th Annual Assembly
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IIW 2012 - 15
IIW 2012 - IIW International Conference 2012 - Program
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IIW 2012 - IIW International Conference 2012 - Abstracts
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IIW 2012 - Speaker Bio Information
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IIW 2012 - Smartphone App
IIW 2012 - Social Program
IIW 2012 - Technical Visits
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IIW 2012 - Social Tours
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IIW 2012 - Tour Schedule
IIW 2012 - Advertising Sponsor Profiles
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IIW 2012 - Commission XIII Fracture Mechanics Seminar
IIW 2012 - IIW 2012 Sponsors
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IIW 2012 - Cover3
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