Using small punch test data to determine creep strain and strength reduction properties for heat affected zones

Stefan Holmström (Corresponding Author), Pertti Auerkari, R Hurst, D Blagoeva

    Research output: Contribution to journalArticleScientificpeer-review

    11 Citations (Scopus)

    Abstract

    The small punch (SP) test is a miniature technique that can provide information on creep performance of local features in welded components. However, the multiaxial stress and deformation history in SP test means that it can be a challenge to interpret the test results in a way that is comparable to uniaxial standard creep testing. This work aimed to compare SP test results from as new and service exposed P91 (9Cr-1Mo-V-Nb) base material (BM) and heat affected zones (HAZ) to uniaxial creep testing results from welded new and service exposed material. Two methods are proposed for predicting the uniaxial strain response for any zone of the weld: one alternative is to apply the SP rupture data and to accommodate the shape of the uniaxial base material creep curve to that of the zone of interest in the SP test. The other alternative is to use the SP deflection data and an appropriate translation function to the uniaxial creep curve. In both cases, the Wilshire creep equations have been used as the rupture model. The approach will also predict the stress reduction factors of welds and its constituent parts (including the subzones of HAZ). It is proposed that the approach is used to provide the local constitutive creep models for component assessment by finite element analysis (FEA
    Original languageEnglish
    Pages (from-to)63-66
    Number of pages4
    JournalMaterials Science and Technology
    Volume30
    Issue number1
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    punches
    heat affected zone
    Heat affected zone
    Creep
    Creep testing
    Welds
    Finite element method
    axial strain
    curves
    deflection
    histories

    Keywords

    • P91
    • small punch
    • uniaxial creep strain
    • weld srength

    Cite this

    @article{a8ab734a08fe46bc847fb4dabe5bf368,
    title = "Using small punch test data to determine creep strain and strength reduction properties for heat affected zones",
    abstract = "The small punch (SP) test is a miniature technique that can provide information on creep performance of local features in welded components. However, the multiaxial stress and deformation history in SP test means that it can be a challenge to interpret the test results in a way that is comparable to uniaxial standard creep testing. This work aimed to compare SP test results from as new and service exposed P91 (9Cr-1Mo-V-Nb) base material (BM) and heat affected zones (HAZ) to uniaxial creep testing results from welded new and service exposed material. Two methods are proposed for predicting the uniaxial strain response for any zone of the weld: one alternative is to apply the SP rupture data and to accommodate the shape of the uniaxial base material creep curve to that of the zone of interest in the SP test. The other alternative is to use the SP deflection data and an appropriate translation function to the uniaxial creep curve. In both cases, the Wilshire creep equations have been used as the rupture model. The approach will also predict the stress reduction factors of welds and its constituent parts (including the subzones of HAZ). It is proposed that the approach is used to provide the local constitutive creep models for component assessment by finite element analysis (FEA",
    keywords = "P91, small punch, uniaxial creep strain, weld srength",
    author = "Stefan Holmstr{\"o}m and Pertti Auerkari and R Hurst and D Blagoeva",
    year = "2014",
    doi = "10.1179/1743284713Y.0000000311",
    language = "English",
    volume = "30",
    pages = "63--66",
    journal = "Materials Science and Technology",
    issn = "0267-0836",
    publisher = "Maney Publishing",
    number = "1",

    }

    Using small punch test data to determine creep strain and strength reduction properties for heat affected zones. / Holmström, Stefan (Corresponding Author); Auerkari, Pertti; Hurst, R; Blagoeva, D.

    In: Materials Science and Technology, Vol. 30, No. 1, 2014, p. 63-66.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Using small punch test data to determine creep strain and strength reduction properties for heat affected zones

    AU - Holmström, Stefan

    AU - Auerkari, Pertti

    AU - Hurst, R

    AU - Blagoeva, D

    PY - 2014

    Y1 - 2014

    N2 - The small punch (SP) test is a miniature technique that can provide information on creep performance of local features in welded components. However, the multiaxial stress and deformation history in SP test means that it can be a challenge to interpret the test results in a way that is comparable to uniaxial standard creep testing. This work aimed to compare SP test results from as new and service exposed P91 (9Cr-1Mo-V-Nb) base material (BM) and heat affected zones (HAZ) to uniaxial creep testing results from welded new and service exposed material. Two methods are proposed for predicting the uniaxial strain response for any zone of the weld: one alternative is to apply the SP rupture data and to accommodate the shape of the uniaxial base material creep curve to that of the zone of interest in the SP test. The other alternative is to use the SP deflection data and an appropriate translation function to the uniaxial creep curve. In both cases, the Wilshire creep equations have been used as the rupture model. The approach will also predict the stress reduction factors of welds and its constituent parts (including the subzones of HAZ). It is proposed that the approach is used to provide the local constitutive creep models for component assessment by finite element analysis (FEA

    AB - The small punch (SP) test is a miniature technique that can provide information on creep performance of local features in welded components. However, the multiaxial stress and deformation history in SP test means that it can be a challenge to interpret the test results in a way that is comparable to uniaxial standard creep testing. This work aimed to compare SP test results from as new and service exposed P91 (9Cr-1Mo-V-Nb) base material (BM) and heat affected zones (HAZ) to uniaxial creep testing results from welded new and service exposed material. Two methods are proposed for predicting the uniaxial strain response for any zone of the weld: one alternative is to apply the SP rupture data and to accommodate the shape of the uniaxial base material creep curve to that of the zone of interest in the SP test. The other alternative is to use the SP deflection data and an appropriate translation function to the uniaxial creep curve. In both cases, the Wilshire creep equations have been used as the rupture model. The approach will also predict the stress reduction factors of welds and its constituent parts (including the subzones of HAZ). It is proposed that the approach is used to provide the local constitutive creep models for component assessment by finite element analysis (FEA

    KW - P91

    KW - small punch

    KW - uniaxial creep strain

    KW - weld srength

    U2 - 10.1179/1743284713Y.0000000311

    DO - 10.1179/1743284713Y.0000000311

    M3 - Article

    VL - 30

    SP - 63

    EP - 66

    JO - Materials Science and Technology

    JF - Materials Science and Technology

    SN - 0267-0836

    IS - 1

    ER -