A numerical method for reference stress in the evaluation of structure integrity

Haofeng Chen, Z.Z. Cen, B.Y. Xu, S.G. Zhan

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The important concepts of reference stress has been widely used in structural component integrity assessments, both below and within the creep range of temperatures, mainly in Nuclear Electric's (fomerly CEGB) R5 an R6 procedures. The reference-stress method (RSM) has been proven to be successful in problems pertaining to creep growth, rupture damage, creep buckling, and, more recently, elastic-plastic fracture toughness. However, determination of the reference stress is not always a simple task. In the present paper, some existing methods for reference stress in evaluation of structure integrity are investigated in detail. In accordance with the relationship between the reference stress and limit load under certain applied loads or moments, a direct iterative algorithm used to determine the reference stress is proposed which depends on the solution of limit load. The penalty-function method is used to deal with the plastic-incompressibility condition. The numerical difficulties caused by the nonlinearity and nonsmoothness of the goal function are overcome. Numerical examples are given to demonstrate the applicability of the procedure.
LanguageEnglish
Pages47-53
Number of pages7
JournalInternational Journal of Pressure Vessels and Piping
Volume71
Issue number1
DOIs
Publication statusPublished - 30 Apr 1997

Fingerprint

Numerical methods
Creep
Load limits
Plastics
Buckling
Fracture toughness
Loads (forces)
Temperature

Keywords

  • numerical methods
  • reference stress
  • structure integrity

Cite this

@article{b153c08d9bba4fc7b8e4c10e849f4050,
title = "A numerical method for reference stress in the evaluation of structure integrity",
abstract = "The important concepts of reference stress has been widely used in structural component integrity assessments, both below and within the creep range of temperatures, mainly in Nuclear Electric's (fomerly CEGB) R5 an R6 procedures. The reference-stress method (RSM) has been proven to be successful in problems pertaining to creep growth, rupture damage, creep buckling, and, more recently, elastic-plastic fracture toughness. However, determination of the reference stress is not always a simple task. In the present paper, some existing methods for reference stress in evaluation of structure integrity are investigated in detail. In accordance with the relationship between the reference stress and limit load under certain applied loads or moments, a direct iterative algorithm used to determine the reference stress is proposed which depends on the solution of limit load. The penalty-function method is used to deal with the plastic-incompressibility condition. The numerical difficulties caused by the nonlinearity and nonsmoothness of the goal function are overcome. Numerical examples are given to demonstrate the applicability of the procedure.",
keywords = "numerical methods, reference stress , structure integrity",
author = "Haofeng Chen and Z.Z. Cen and B.Y. Xu and S.G. Zhan",
year = "1997",
month = "4",
day = "30",
doi = "10.1016/S0308-0161(96)00040-3",
language = "English",
volume = "71",
pages = "47--53",
journal = "International Journal of Pressure Vessels and Piping",
issn = "0308-0161",
number = "1",

}

A numerical method for reference stress in the evaluation of structure integrity. / Chen, Haofeng; Cen, Z.Z.; Xu, B.Y.; Zhan, S.G.

In: International Journal of Pressure Vessels and Piping, Vol. 71, No. 1, 30.04.1997, p. 47-53.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A numerical method for reference stress in the evaluation of structure integrity

AU - Chen, Haofeng

AU - Cen, Z.Z.

AU - Xu, B.Y.

AU - Zhan, S.G.

PY - 1997/4/30

Y1 - 1997/4/30

N2 - The important concepts of reference stress has been widely used in structural component integrity assessments, both below and within the creep range of temperatures, mainly in Nuclear Electric's (fomerly CEGB) R5 an R6 procedures. The reference-stress method (RSM) has been proven to be successful in problems pertaining to creep growth, rupture damage, creep buckling, and, more recently, elastic-plastic fracture toughness. However, determination of the reference stress is not always a simple task. In the present paper, some existing methods for reference stress in evaluation of structure integrity are investigated in detail. In accordance with the relationship between the reference stress and limit load under certain applied loads or moments, a direct iterative algorithm used to determine the reference stress is proposed which depends on the solution of limit load. The penalty-function method is used to deal with the plastic-incompressibility condition. The numerical difficulties caused by the nonlinearity and nonsmoothness of the goal function are overcome. Numerical examples are given to demonstrate the applicability of the procedure.

AB - The important concepts of reference stress has been widely used in structural component integrity assessments, both below and within the creep range of temperatures, mainly in Nuclear Electric's (fomerly CEGB) R5 an R6 procedures. The reference-stress method (RSM) has been proven to be successful in problems pertaining to creep growth, rupture damage, creep buckling, and, more recently, elastic-plastic fracture toughness. However, determination of the reference stress is not always a simple task. In the present paper, some existing methods for reference stress in evaluation of structure integrity are investigated in detail. In accordance with the relationship between the reference stress and limit load under certain applied loads or moments, a direct iterative algorithm used to determine the reference stress is proposed which depends on the solution of limit load. The penalty-function method is used to deal with the plastic-incompressibility condition. The numerical difficulties caused by the nonlinearity and nonsmoothness of the goal function are overcome. Numerical examples are given to demonstrate the applicability of the procedure.

KW - numerical methods

KW - reference stress

KW - structure integrity

U2 - 10.1016/S0308-0161(96)00040-3

DO - 10.1016/S0308-0161(96)00040-3

M3 - Article

VL - 71

SP - 47

EP - 53

JO - International Journal of Pressure Vessels and Piping

T2 - International Journal of Pressure Vessels and Piping

JF - International Journal of Pressure Vessels and Piping

SN - 0308-0161

IS - 1

ER -