Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches

Ari Koskinen, Jonne Haapalainen, Iikka Virkkunen, Mika Kemppainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publication18th World Conference on Nondestructive Testing, WCNDT
    Number of pages8
    Publication statusPublished - 2012
    MoE publication typeA4 Article in a conference publication
    Event18th World Conference on Non-Destructive Testing, WCNDT - Durban, South Africa
    Duration: 16 Apr 201220 Apr 2012

    Conference

    Conference18th World Conference on Non-Destructive Testing, WCNDT
    Abbreviated titleWCNDT
    CountrySouth Africa
    CityDurban
    Period16/04/1220/04/12

    Fingerprint

    Thermal fatigue
    Ultrasonics
    Defects
    Nondestructive examination
    Inspection
    Acoustic microscopes
    Steel pipe
    Austenitic stainless steel
    Surface roughness
    Fatigue cracks
    Cracks
    Scanning

    Keywords

    • ultrasound
    • ultrasonic inspection
    • C-mode scanning acoustic microscope (C-SAM)
    • thermal fatigue
    • indication
    • discontinuity
    • defect
    • qualification

    Cite this

    Koskinen, A., Haapalainen, J., Virkkunen, I., & Kemppainen, M. (2012). Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches. In Proceedings : 18th World Conference on Nondestructive Testing, WCNDT
    Koskinen, Ari ; Haapalainen, Jonne ; Virkkunen, Iikka ; Kemppainen, Mika. / Differences in Ultrasonic Indications : Thermal Fatigue Cracks and EDM Notches. Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 2012.
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    title = "Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches",
    abstract = "Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.",
    keywords = "ultrasound, ultrasonic inspection, C-mode scanning acoustic microscope (C-SAM), thermal fatigue, indication, discontinuity, defect, qualification",
    author = "Ari Koskinen and Jonne Haapalainen and Iikka Virkkunen and Mika Kemppainen",
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    Koskinen, A, Haapalainen, J, Virkkunen, I & Kemppainen, M 2012, Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches. in Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 18th World Conference on Non-Destructive Testing, WCNDT, Durban, South Africa, 16/04/12.

    Differences in Ultrasonic Indications : Thermal Fatigue Cracks and EDM Notches. / Koskinen, Ari; Haapalainen, Jonne; Virkkunen, Iikka; Kemppainen, Mika.

    Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 2012.

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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    T2 - Thermal Fatigue Cracks and EDM Notches

    AU - Koskinen, Ari

    AU - Haapalainen, Jonne

    AU - Virkkunen, Iikka

    AU - Kemppainen, Mika

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    N2 - Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.

    AB - Different types of artificial defects are used for a qualification of NDT methods. The representativeness of these defects, as compared to service induce flaws, is crucial when the performance of NDT method or inspector is evaluated. Ultrasonic indications are highly dependent on defect characteristics like roughness, crack opening, tilt and branching. These characteristics are even more significant than the defect size. To develop performance and reliability of ultrasonic inspection methods and procedures more research on different type of discontinuity indications is needed. In this study, indications from different types of discontinuities are measured using C-mode scanning acoustic microscope (C-SAM). The inspection item is austenitic stainless steel pipe with thermal fatigue cracks and similar size of EDM notches. Clear difference can be seen between indications from the EDM notches and from the thermal fatigue cracks.

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    KW - ultrasonic inspection

    KW - C-mode scanning acoustic microscope (C-SAM)

    KW - thermal fatigue

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    KW - discontinuity

    KW - defect

    KW - qualification

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    Koskinen A, Haapalainen J, Virkkunen I, Kemppainen M. Differences in Ultrasonic Indications: Thermal Fatigue Cracks and EDM Notches. In Proceedings : 18th World Conference on Nondestructive Testing, WCNDT. 2012