An Assessment Procedure for the High Temperature Response of Structures

Goodall, I.W.; Ainsworth, R.A.

doi:10.1007/978-3-642-84455-3_35

Cited by 71 publications

(26 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Number of cycles to failure at each strain range is determined from fatigue endurance data. In this method non-linear fracture mechanics based modelling is employed to analyse the initiation period of a small crack extension [1][2][3]. This method uses the reference stress method for evaluating C* and assumes that the crack tip stresses can be described by steady state C*.…”

Section: Methods 1: Sigma σ D Approachmentioning

confidence: 99%

“…It is usual for the codes to discount initiation when fatigue is present. The methods proposed have been successfully employed in different European assessment codes [1][2][3][4][5][6][7][8][9]. Since little universal validation exist to justify the choice of one method over another it is proposed to implement four models for crack initiation at this stage.…”

Section: Modelling Initiation -Stagementioning

confidence: 99%

“…A number of defect assessment procedures (e.g. the British Energy R5 and the French A16, BS-7910 [1][2][3][4][5][6] and the German FBH and two-criteria method) [7][8] based on experimental and analytical models are available to assess crack initiation and growth and to determine the remaining useful life of such components.…”

Section: Introductionmentioning

confidence: 99%

“…It is clear that Europe is a leader in this developing field. Comparison of the existing European high temperature life assessment codes [1][2][3][4][5][6][7][8][9] lead to the conclusion that crack initiation is dealt with in different ways by the codes whereas creep and creep/fatigue crack growth are considered using the same models for analysis. At the same time whilst increasing sophistication is implemented in the analysis at the deterministic level insufficient emphasis is placed on the effects of the sensitivity and applicable bounds of the various parameters and material properties.…”

mentioning

confidence: 99%

See 3 more Smart Citations

A unified European approach to high temperature defect assessment code and its incorporation in a knowledge base system

Nikbin¹

2001

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

The background to high temperature defect assessment methodologies is investigated and similarities and differences are highlighted. It is clear that Europe is a leader in this developing field. Comparison of the existing European high temperature life assessment codes [1][2][3][4][5][6][7][8][9] lead to the conclusion that crack initiation is dealt with in different ways by the codes whereas creep and creep/fatigue crack growth are considered using the same models for analysis. At the same time whilst increasing sophistication is implemented in the analysis at the deterministic level insufficient emphasis is placed on the effects of the sensitivity and applicable bounds of the various parameters and material properties. The survey showed that for the same methods of analysis, widely different results can be derived depending on the choice of material properties, method for calculating K, reference stress σ ref and C*. The reason for the differences and the sensitivity to them is highlighted in this paper. The resulting conclusions suggest a methodology based on an expert system using both deterministic and probabilistic techniques would be beneficial. An outline of a defect assessment code structure, taking account of the major European codes, is presented which allows flexibility in terms of input of material data as well as the models used. The structure and the further development of the HIDA Knowledge Based System (KBS) is based on the concepts presented.Keyword: life assessment, creep, fatigue, power generation, knowledge based system Introduction Components in the power generation and petro-chemical industry operating at high temperatures are almost invariably submitted to static and/or combined loading. They may fail by crack growth, net section rupture or a combination of both. The present paper considers the defect assessment regime of failure. Figure 1 shows a schematic diagram of the range of crack initiation and growth bahaviour that a cracked component might show. A number of defect assessment procedures (e.g. the British Energy R5 and the French A16, BS-7910 [1-6] and the German FBH and two-criteria method) [7][8] based on experimental and analytical models are available to assess crack initiation and growth and to determine the remaining useful life of such components.

show abstract

Section: Methods 1: Sigma σ D Approachmentioning

confidence: 99%

Section: Modelling Initiation -Stagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A unified European approach to high temperature defect assessment code and its incorporation in a knowledge base system

Nikbin¹

2001

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

show abstract

“…References [1][2][3][4][5]), as applied in design procedures, and for the development of new methods. A number of methods exist for the inelastic analysis of structures, each has some beneÿt or drawback associated with it.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis and evaluation of design limits for structural materials in a cyclic state of creep

Boulbibane

Ponter

2003

Numerical Meth Engineering

View full text Add to dashboard Cite

SUMMARYIn this paper a direct non-time stepping method derived from the minimum theorems given by the authors (European Journal of Mechanics -A/Solids 2002; 21:915-925) is outlined. This method can be used in the prediction of the deformation and life assessment of structures subjected to cyclic mechanical and thermal loadings. It produces accurate predictions of failure modes based on material behaviour incorporated into constitutive equations. It also can be used to deÿne limit loads related to certain design criteria.Generally, for complex geometries and load histories, the identiÿcation of load histories that correspond to predeÿned design conditions, in the form of time or number of cycles to failure, can only be achieved by extensive and repeated calculations. For the Linear Matching Method, however, the representation of materially non-linear stress and strain ÿelds by linear behaviour with spatially varying moduli, indicates the possibility that direct evaluation of loads and temperature ranges that correspond to a design restriction may be evaluated directly through the construction of the exact cyclic state and via sequence of approximations. The technique employs the ÿnite element method combined with the cyclic state solution. The description of the material behaviour is given by a non-linear viscous model (Norton's law). It can also apply to any class of material behaviour that includes internal state variables. This technique has been applied successfully to a set of characteristics problems (Bree problem and plate containing a circular hole and subjected to radial temperature gradient).

show abstract

Limit States of Materials and Structures

Weichert

Alan

2009

View full text Add to dashboard Cite

To predict loading limits for structures and structural elements is one of the oldest and most important tasks of engineers. Among the theoretical and numerical methods available for this purpose, so-called "Direct Methods", embracing Limit-and Shakedown Analysis, play an eminent role due to the fact that they allow rapid access to the requested information in mathematically constructive manners.The collection of papers in this book is the outcome of a workshop held at Aachen University of Technology in November 2007. The individual contributions stem in particular from the areas of new numerical developments rendering the methods more attractive for industrial design, extensions of the general methodology to new horizons of application, probabilistic approaches and concrete technological applications.The papers are arranged according to the order of the presentations in the workshop and give an excellent insight into state-of-the-art developments in this broad and growing field of research.The editors warmly thank all the scientists, who have contributed by their outstanding papers to the quality of this edition. Special thanks go to Jaan Simon for his great help in putting together the manuscript to its final shape. We hope you may enjoy reading it!

show abstract

An Assessment Procedure for the High Temperature Response of Structures

Cited by 71 publications

References 4 publications

A unified European approach to high temperature defect assessment code and its incorporation in a knowledge base system

A unified European approach to high temperature defect assessment code and its incorporation in a knowledge base system

Finite element analysis and evaluation of design limits for structural materials in a cyclic state of creep

Limit States of Materials and Structures

Contact Info

Product

Resources

About