Statistical Analysis of Residual Stress Profiles Using a Heuristic Method

Teng, Huaguo; Bate, S. K.; Beardsmore, D. W.

doi:10.1115/pvp2008-61378

Cited by 4 publications

(4 citation statements)

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“…The heuristic fitting method and the corresponding software tool have been used previously in data analysis for determining the residual stress profiles of pipe girth welds [3]. A brief description is given below.…”

Section: Analysis Methodologymentioning

confidence: 99%

“…In previous work the authors have developed a heuristic method [3] for determining residual stress profiles which is based on a combination of the weighted least-squares method and the application of expert judgment. The least-squares method allows a model of the best residual stress profile to be determined as a linear combination of basis functions, and the expert judgement allows weights to be chosen from the observed scatter in the measured residual stress data.…”

Section: Introductionmentioning

confidence: 99%

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Residual Stress Profiles of Pipe Girth Weld Using a Stress Decomposition Method

Teng

Bate

2014

Volume 6B: Materials and Fabrication

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The application of procedures such as R6 or BS7910 for the structural assessment of defects in pressurised components containing residual stresses requires knowledge of the throughwall residual stress profile. Currently there is much interest in improving the residual stress profiles that are provided in the procedures. In this paper we present an improved analysis of residual stresses of the pipe girth welds by applying the developed heuristic method to one set of extended residual stress measurement data. The through-thickness residual stress is decomposed into three stress components: membrane, bending and self-equilibrating. The heuristic method was applied to the three components separately, so that the residual stress profile was a combination of the three stress components. This form provides not only a clear physical basis for the residual stress profile, but is also convenient for defect assessment where only the membrane and bending stress components are important.

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Section: Analysis Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Residual Stress Profiles of Pipe Girth Weld Using a Stress Decomposition Method

Teng

Bate

2014

Volume 6B: Materials and Fabrication

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“…over-estimate) of the level of stress for use in assessment. Alternative statistical methods based on a heuristic method [8] and Bayesian analysis [9] are being developed which can account for the uncertainty associated with residual stress measurements and thus provide less pessimistic Level 2 profiles and more generic Level 3 profiles. Both methods were used to determine the residual stress profiles for austenitic stainless steel girth welds [10] and the derived profiles were compared with the current profiles in R6 and API 579 [11].…”

Section: Residual Stress Profilesmentioning

confidence: 99%

Developments in the Treatment of Residual Stresses in Welded Components

Bate

Symington

Sharples

et al. 2011

MSF

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A long-term UK research programme on environmentally assisted cracking (EAC), residual stresses [1, 2] and fracture mechanics [3, 4] was launched in 2004. It involves Rolls-Royce plc and Serco Technical Services, supported by UK industry and academia. The residual stress programme is aimed at progressing the understanding of residual stresses and on the basis of this understanding manage how residual stresses affect the structural integrity of plant components. Improved guidance being developed for the treatment of residual stresses in fracture assessments includes the use of stress intensity factor solutions for displacement controlled loading as opposed to the more commonly used load controlled solutions. Potential reductions in crack driving force are also being investigated in relation to (i) utilizing a residual stress field that has “shaken-down” due to operational loads, (ii) introducing a crack progressively as opposed to instantaneously, and (iii) allowing for the fact that a crack may have been initiated during the life of a component as opposed to being present from the start-of-life. This paper describes some of these latest developments in relation to residual stress effects

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“…They have the drawback that the inevitable scatter in published measurements tends to drive a simple upper bound towards the material yield strength, so there can often be little advantage in moving from a Level 1 to a Level 2 profile. Alternative estimation methods based upon heuristics, 21 Bayesian statistics, [22][23][24] and neural networks 25,26 are under active development in a bid to better handle uncertainty in the measured data and provide less pessimistic generic residual stress profiles.…”

Section: Introductionmentioning

confidence: 99%

Determination of residual stresses in welded components by finite element analysis

Bate¹,

Smith

2016

Materials Science and Technology

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The continued safe and reliable operation of plant invariably has to consider the assessment of defects in welded structural components. This requires some estimate of the residual stresses that have developed during the welding fabrication process. There is an increasing use of computational weld mechanics to evaluate residual stresses and this paper describes the development of guidelines for using finite element analysis, which are now incorporated into the EDF Energy R6 defect assessment procedure, to determine stresses for use in the procedure. Prior to use in assessment the predicted results should be validated by comparison with measurements and the guidelines provide advice on the differing standards of validation which may be applied including the manufacture and testing of validation mock-ups. This paper is part of a Themed Issue on Measurement, modelling and mitigation of residual stress.

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Statistical Analysis of Residual Stress Profiles Using a Heuristic Method

Cited by 4 publications

References 0 publications

Residual Stress Profiles of Pipe Girth Weld Using a Stress Decomposition Method

Residual Stress Profiles of Pipe Girth Weld Using a Stress Decomposition Method

Developments in the Treatment of Residual Stresses in Welded Components

Determination of residual stresses in welded components by finite element analysis

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