Master Curve analysis of inhomogeneous ferritic steels

Kim Wallin (Corresponding Author), Pekka Nevasmaa, Anssi Laukkanen, Tapio Planman

Research output: Contribution to journalArticleScientificpeer-review

73 Citations (Scopus)

Abstract

The basic Master Curve (MC) method for analysis of brittle fracture test results is intended for macroscopically homogeneous ferritic steels only. In reality, the steels in question are seldom fully macroscopically homogeneous. The materials' toughness may depend on the specimen location in the sample. Inhomogeneity may be deterministic or random (or a mixture of both) in nature. Deterministic inhomogeneity can be accounted for, provided that the specimen extraction histories are known and enough specimens are tested. Random inhomogeneity is much more difficult to handle. The structural integrity assessment procedure SINTAP contains a lower tail modification of the MC analysis. This enables conservative lower bound type fracture toughness estimates also for inhomogeneous materials. The problem is that the SINTAP method, does not provide information of the tougher material. Therefore, a probabilistic description of the complete material is not possible. In this paper, a new comparatively simple extension of the MC is introduced for inhomogeneities governed by two separate MC distributions. The extension is shown to be extremely efficient in describing e.g. weld heat-affected zone (HAZ) data. In addition, a simple method for the analysis of random inhomogeneous material consisting of mixed data is presented. The method is also applicable for data sets including several different materials.
Original languageEnglish
Pages (from-to)2329 - 2346
Number of pages18
JournalEngineering Fracture Mechanics
Volume71
Issue number16-17
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Ferritic steel
Steel
Brittle fracture
Heat affected zone
Structural integrity
Toughness
Fracture toughness
Welds

Keywords

  • Master Curve
  • ferritic steels
  • inhomogeneity
  • brittle fracture
  • statistical analysis
  • fracture toughness
  • heat affected zones
  • weld
  • ProperTune

Cite this

Wallin, Kim ; Nevasmaa, Pekka ; Laukkanen, Anssi ; Planman, Tapio. / Master Curve analysis of inhomogeneous ferritic steels. In: Engineering Fracture Mechanics. 2004 ; Vol. 71, No. 16-17. pp. 2329 - 2346.
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Master Curve analysis of inhomogeneous ferritic steels. / Wallin, Kim (Corresponding Author); Nevasmaa, Pekka; Laukkanen, Anssi; Planman, Tapio.

In: Engineering Fracture Mechanics, Vol. 71, No. 16-17, 2004, p. 2329 - 2346.

Research output: Contribution to journalArticleScientificpeer-review

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