ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 11 December 2008
Page Count: 8

The Influence of Instrumented Striker Configuration on the Results of Dynamic Toughness Testing

Lucon, Enrico
Institute of Nuclear Material Science, SCK⋅CEN, Mol,

(Received 21 August 2008; accepted 10 October 2008)

Abstract

Several studies are available on the influence of the edge radius of instrumented strikers (ASTM — 8 mm or ISO — 2 mm) on the results of both non-instrumented and instrumented Charpy tests. This paper investigates the effect of using either a 2 mm or a 8 mm striker when performing dynamic toughness tests at impact loading rates on precracked Charpy specimens. Existing data from tests run in the ductile-to-brittle region (dynamic Master Curve reference temperature) and in the upper shelf regime (ductile initiation fracture toughness and crack resistance curves) have been analyzed. The results show that 2 mm strikers tend to yield lower cleavage fracture toughness in the transition region (although the effect cannot be considered statistically significant), whereas the influence of striker configuration is negligible in the upper shelf regime when data are generated using the low-blow multiple-specimen technique.

Keywords:
instrumented Charpy tests, striking edge radius, dynamic toughness tests, precracked Charpy specimens, dynamic Master Curve, low-blow technique

Paper ID: JAI102092
DOI: 10.1520/JAI102092
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