Instrumented impact testing machine with reduced specimen oscillation effects

Rauno Rintamaa, Klaus Rahka, Kim Wallin, Kari Ikonen, Heli Talja, Heikki Kotilainen, Erkki Sirkkola

    Research output: Book/ReportReport

    Abstract

    Owing to small and inexpensive specimens the Charpy impact test is widely used in quality control and alloy development. Limitations in power reactor surveillance capsules it is also widely used for safety analysis purposes. Instrumenting the tub and computerising data acquisition, makes dynamic fracture mechanics data measurement possible and convenient. However, the dynamic effects (inertia forces, specimen oscillations) in the impact test cause inaccuracies in the recorded load-time diagram and hence diminish the reliability of the calculated dynamic fracture mechanics parametres. To decrease inaccuracies a new pendulum type of instrumented impact test apparatus has been developed and constructed in the Metals Laboratory of the Technical Research Centre of Finland. This tester is based on a new principle involving inverted test geometry. The purpose of the geometry inversion is to reduce inertia load and specimen oscillation effects. Further, the new impact tester has some other novel features: e.g. the available initia impact energy is about double compared to the conventional standard (300 J) impact tester allowing the use of larger (10 x 20 x 110 mm) bend specimens than normal Charpy specimens. Also, the rotation axis in the three point bending is nearly stationary making COD-measurements possible. An experimental test series is described in which the inertia effects and specimen oscillation are compared in the conventional and new impact tester utilising Charpy V-notch specimens. Comparison of the two test geometries is also made with the aid of an analytical model using finite element method (FEM) analysis.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages46
    ISBN (Print)951-38-2098-X
    Publication statusPublished - 1984
    MoE publication typeD4 Published development or research report or study

    Publication series

    SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
    Number290
    ISSN0358-5077

    Fingerprint

    Impact testing
    Fracture mechanics
    Geometry
    Pendulums
    Quality control
    Analytical models
    Data acquisition
    Finite element method
    Metals

    Keywords

    • impact tests
    • quality control
    • power reactors (nuclear)

    Cite this

    Rintamaa, R., Rahka, K., Wallin, K., Ikonen, K., Talja, H., Kotilainen, H., & Sirkkola, E. (1984). Instrumented impact testing machine with reduced specimen oscillation effects. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 290
    Rintamaa, Rauno ; Rahka, Klaus ; Wallin, Kim ; Ikonen, Kari ; Talja, Heli ; Kotilainen, Heikki ; Sirkkola, Erkki. / Instrumented impact testing machine with reduced specimen oscillation effects. Espoo : VTT Technical Research Centre of Finland, 1984. 46 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 290).
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    Rintamaa, R, Rahka, K, Wallin, K, Ikonen, K, Talja, H, Kotilainen, H & Sirkkola, E 1984, Instrumented impact testing machine with reduced specimen oscillation effects. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 290, VTT Technical Research Centre of Finland, Espoo.

    Instrumented impact testing machine with reduced specimen oscillation effects. / Rintamaa, Rauno; Rahka, Klaus; Wallin, Kim; Ikonen, Kari; Talja, Heli; Kotilainen, Heikki; Sirkkola, Erkki.

    Espoo : VTT Technical Research Centre of Finland, 1984. 46 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 290).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Instrumented impact testing machine with reduced specimen oscillation effects

    AU - Rintamaa, Rauno

    AU - Rahka, Klaus

    AU - Wallin, Kim

    AU - Ikonen, Kari

    AU - Talja, Heli

    AU - Kotilainen, Heikki

    AU - Sirkkola, Erkki

    PY - 1984

    Y1 - 1984

    N2 - Owing to small and inexpensive specimens the Charpy impact test is widely used in quality control and alloy development. Limitations in power reactor surveillance capsules it is also widely used for safety analysis purposes. Instrumenting the tub and computerising data acquisition, makes dynamic fracture mechanics data measurement possible and convenient. However, the dynamic effects (inertia forces, specimen oscillations) in the impact test cause inaccuracies in the recorded load-time diagram and hence diminish the reliability of the calculated dynamic fracture mechanics parametres. To decrease inaccuracies a new pendulum type of instrumented impact test apparatus has been developed and constructed in the Metals Laboratory of the Technical Research Centre of Finland. This tester is based on a new principle involving inverted test geometry. The purpose of the geometry inversion is to reduce inertia load and specimen oscillation effects. Further, the new impact tester has some other novel features: e.g. the available initia impact energy is about double compared to the conventional standard (300 J) impact tester allowing the use of larger (10 x 20 x 110 mm) bend specimens than normal Charpy specimens. Also, the rotation axis in the three point bending is nearly stationary making COD-measurements possible. An experimental test series is described in which the inertia effects and specimen oscillation are compared in the conventional and new impact tester utilising Charpy V-notch specimens. Comparison of the two test geometries is also made with the aid of an analytical model using finite element method (FEM) analysis.

    AB - Owing to small and inexpensive specimens the Charpy impact test is widely used in quality control and alloy development. Limitations in power reactor surveillance capsules it is also widely used for safety analysis purposes. Instrumenting the tub and computerising data acquisition, makes dynamic fracture mechanics data measurement possible and convenient. However, the dynamic effects (inertia forces, specimen oscillations) in the impact test cause inaccuracies in the recorded load-time diagram and hence diminish the reliability of the calculated dynamic fracture mechanics parametres. To decrease inaccuracies a new pendulum type of instrumented impact test apparatus has been developed and constructed in the Metals Laboratory of the Technical Research Centre of Finland. This tester is based on a new principle involving inverted test geometry. The purpose of the geometry inversion is to reduce inertia load and specimen oscillation effects. Further, the new impact tester has some other novel features: e.g. the available initia impact energy is about double compared to the conventional standard (300 J) impact tester allowing the use of larger (10 x 20 x 110 mm) bend specimens than normal Charpy specimens. Also, the rotation axis in the three point bending is nearly stationary making COD-measurements possible. An experimental test series is described in which the inertia effects and specimen oscillation are compared in the conventional and new impact tester utilising Charpy V-notch specimens. Comparison of the two test geometries is also made with the aid of an analytical model using finite element method (FEM) analysis.

    KW - impact tests

    KW - quality control

    KW - power reactors (nuclear)

    M3 - Report

    SN - 951-38-2098-X

    T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

    BT - Instrumented impact testing machine with reduced specimen oscillation effects

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Rintamaa R, Rahka K, Wallin K, Ikonen K, Talja H, Kotilainen H et al. Instrumented impact testing machine with reduced specimen oscillation effects. Espoo: VTT Technical Research Centre of Finland, 1984. 46 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 290).