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/ReportReportProfessional

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

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume290

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/ReportReportProfessional

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AU - Rintamaa, Rauno

AU - Rahka, Klaus

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AU - Ikonen, Kari

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AU - Kotilainen, Heikki

AU - Sirkkola, Erkki

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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.

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M3 - Report

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PB - VTT Technical Research Centre of Finland

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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).