Estimation of crack-arrest toughness transition and NDT temperatures from Charpy force-displacement impact traces

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Abstract

A force-displacement trace of a Charpy impact test of a reactor pressure vessel (RPV) steel in the transition range has a characteristic point, the so-called "force at the end of unstable crack propagation", F a. A two-parameter Weibull probability function is used to model the distribution of the Fa in Charpy tests performed at ORNL on different RPV steels in the unirradiated and irradiated conditions. These data have a good replication at a given test temperature, thus, the statistical analysis was applicable. It is shown that when temperature is normalized to TNDT (T-TNDT) or to T100a (T-T100a) the median Fa values of different RPV steels have a tendency to form the same shape of temperature dependence. Depending on normalization temperature, T NDT or T100a, it suggests a universal shape of the temperature dependence of Fa for different RPV steels. The best fits for these temperature dependencies are presented. These dependencies are suggested for use in estimation of NDT or T100a from randomly generated Charpy impact tests. The maximum likelihood method is used to derive equations to estimate TNDT and T100a from randomly generated Charpy impact tests.

Original languageEnglish
Title of host publicationProceedings of the ASME Pressure Vessels and Piping Conference 2009 - Materials and Fabrication
Pages811-815
Number of pages5
EditionPART A
DOIs
StatePublished - 2010
Event2009 ASME Pressure Vessels and Piping Conference - Prague, Czech Republic
Duration: Jul 26 2009Jul 30 2009

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
NumberPART A
Volume6
ISSN (Print)0277-027X

Conference

Conference2009 ASME Pressure Vessels and Piping Conference
Country/TerritoryCzech Republic
CityPrague
Period07/26/0907/30/09

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