Quantifying Tstress controlled constraint by the master curve transition temperature T0

Kim Wallin (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    102 Citations (Scopus)


    Specimen size, crack depth and loading conditions may effect the materials fracture toughness. In order to safeguard against these geometry effects, fracture toughness testing standards prescribe the use of highly constrained deep cracked bend specimens having a sufficient size to guarantee conservative fracture toughness values. One of the more advanced testing standards, for brittle fracture, is the master curve standard ASTM E1921-97, which is based on technology developed at VTT Manufacturing Technology. When applied to a structure with low constraint geometry, the standard fracture toughness estimates may lead to strongly over-conservative estimate of structural performance. In some cases, this may lead to unnecessary repairs or even to an early “retirement” of the structure. In the case of brittle fracture, essentially three different methods to quantify constraint have been proposed, J small scale yielding correction, Q-parameter and the Tstress. Here, a relation between the Tstress and the master curve transition temperature T0 is experimentally developed and verified. As a result, a new engineering tool to assess low constraint geometries with respect to brittle fracture has been obtained.
    Original languageEnglish
    Pages (from-to)303-328
    Number of pages26
    JournalEngineering Fracture Mechanics
    Issue number3
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed


    • master curve
    • constraint
    • T stress
    • brittle fracture
    • shallow flaws


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