SYMPOSIA PAPER Published: 01 January 2002
STP10836S

RESQUE: Determination of the Lowest Acceptable Insert Length for Reconstituted C -impact and Precracked C Specimen

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One of the tasks within the framework of the EU “RESQUE”- project was to determine the lowest acceptable insert length for reconstituted Charpy V impact (Cv) and pre-cracked Charpy V (PC Cv) specimens. In order to obtain an optimized insert length, Cv impact specimens with three insert lengths ranging from 10 to 20 mm and fracture toughness PC Cv specimens with two different insert lengths of a reference material were manufactured by stud-welding or electron-beam welding and tested under various test conditions. Cv tests on reconstituted specimens exhibited the normal scatter in Charpy energies and that there was no significant influence of the insert length on the transition temperatures. However, the 10 mm insert caused a reduction in the upper shelf energy of 10–15%. The fracture toughness tests carried out in the transition regime showed that the 10 mm insert resulted in a lower estimate (non-conservative) of T0 compared with the values measured on 12mm insert and baseline specimens. It is therefore recommended that at least 12 mm long inserts should be used for fracture toughness testing in the transition region. In the ductile region a trend to lower initiation toughness values at higher temperatures was observed. To avoid this, 20 mm long inserts should be used for J-Δa curves at higher temperatures.

Author Information

Keim, E
Siemens, Erlangen, Germany
Langer, R
Siemens, Erlangen, Germany
van Walle, E
SCK•CEN, Mol, Belgium
Scibetta, M
SCK•CEN, Mol, Belgium
Valo, MJ
VTT Manufacturing Technology, Espoo, Finland
Viehrig, H-W
Research Center Rossendorf Inc., Dresden, Germany
Richter, H
Research Center Rossendorf Inc., Dresden, Germany
Atkins, T
AEA Technology, Harwell, UK
Wootton, MR
BNFL Magnox Generation, Berkeley, UK
Debarberis, L
JRC/IAM, Petten, The Netherlands
Horsten, M
NRG, Petten, The Netherlands
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Developed by Committee: E10
Pages: 426–437
DOI: 10.1520/STP10836S
ISBN-EB: 978-0-8031-5465-0
ISBN-13: 978-0-8031-2897-2