The linear matching method applied to the high temperature life integrity of structures. Part 1. Assessments involving constant residual stress fields

Haofeng Chen, Alan R.S. Ponter, R.A. Ainsworth

Research output: Contribution to journalArticle

42 Citations (Scopus)
45 Downloads (Pure)

Abstract

Design and life assessment procedures for high temperatures are based on 'expert knowledge' in structural mechanics and materials science, combined with simplified methods of structural analysis. Of these R5 is one of the most widely used life assessment methods internationally with procedures based on reference stress techniques and shakedown calculations using linear elastic solutions. These have been augmented by full finite element analysis and, recently, the development of a new programming method, the Linear Matching Method (LMM), that allows a range of direct solutions that include shakedown methods and simplified analysis in excess of shakedown. In this paper LMM procedures are compared with calculations typical of those employed in R5 for cyclic loading problems when the assumption of a constant residual stress field is appropriate including shakedown and limit analyses, creep rupture analysis and the evaluation of accumulated creep deformation. A typical example of a 3D holed plate subjected to a cyclic thermal load and a constant mechanical load is assessed in detail. These comparisons demonstrate the significant advantages of linear matching methods for a typical case. For a range of cyclic problems when the residual stress field varies during the cycle, which include the evaluation of plastic strain amplitude, ratchet limit and accumulated creep strains during a high temperature dwell periods, the corresponding LMM and R5 procedures are discussed in an accompanying paper.
Original languageEnglish
Pages (from-to)123-135
Number of pages12
JournalInternational Journal of Pressure Vessels and Piping
Volume83
DOIs
Publication statusPublished - 2006

Keywords

  • linear matching
  • shakedown
  • creep rupture
  • rapid cycle solution
  • materials science

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