Specimen size limitations in J-R curve testing

Standards versus reality

Kim Wallin

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

3 Citations (Scopus)

Abstract

Testing standards contain limitations on allowable J and crack growth, related to specimen size. In the case of unirradiated pressure vessel steel, it is usually possible to extract specimens of sufficient size to allow a standard determination of the J-R curve.
However, in the case of irradiated materials, especially irradiated internals, it is normally not possible to use specimens that would provide valid results according to the standard requirement.
This raises the question as to the relevance of the standard requirements. The size requirements stem from the dawn of elastic-plastic fracture mechanics. They have remained practically unchanged ever since, even though the understanding of elastic-plastic fracture mechanics and ductile fracture has evolved considerably.
In this paper, the state-of-art understanding of the ductile fracture process, and elastic-plastic fracture mechanics is combined with experimental test results to derive new more realistic size requirements for J-R curve testing. It is shown that a considerable relaxation of the standard requirements is possible without affecting the reliability of the test result.
This enables an effective and reliable testing of irradiated materials and structures whose dimensions inhibit the extraction of large specimens.
Original languageEnglish
Title of host publicationASTM Special Technical Publication
PublisherAmerican Society for Testing and Materials ASTM
Pages1-17
Volume1502 STP
Publication statusPublished - 2007
MoE publication typeA4 Article in a conference publication

Fingerprint

Fracture mechanics
Testing
Ductile fracture
Plastics
Steel structures
Crack propagation

Keywords

  • ductile fracture
  • J-R curve testing
  • size criteria
  • size effects

Cite this

Wallin, K. (2007). Specimen size limitations in J-R curve testing: Standards versus reality. In ASTM Special Technical Publication (Vol. 1502 STP, pp. 1-17). American Society for Testing and Materials ASTM.
Wallin, Kim. / Specimen size limitations in J-R curve testing : Standards versus reality. ASTM Special Technical Publication. Vol. 1502 STP American Society for Testing and Materials ASTM, 2007. pp. 1-17
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Wallin, K 2007, Specimen size limitations in J-R curve testing: Standards versus reality. in ASTM Special Technical Publication. vol. 1502 STP, American Society for Testing and Materials ASTM, pp. 1-17.

Specimen size limitations in J-R curve testing : Standards versus reality. / Wallin, Kim.

ASTM Special Technical Publication. Vol. 1502 STP American Society for Testing and Materials ASTM, 2007. p. 1-17.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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N2 - Testing standards contain limitations on allowable J and crack growth, related to specimen size. In the case of unirradiated pressure vessel steel, it is usually possible to extract specimens of sufficient size to allow a standard determination of the J-R curve. However, in the case of irradiated materials, especially irradiated internals, it is normally not possible to use specimens that would provide valid results according to the standard requirement. This raises the question as to the relevance of the standard requirements. The size requirements stem from the dawn of elastic-plastic fracture mechanics. They have remained practically unchanged ever since, even though the understanding of elastic-plastic fracture mechanics and ductile fracture has evolved considerably. In this paper, the state-of-art understanding of the ductile fracture process, and elastic-plastic fracture mechanics is combined with experimental test results to derive new more realistic size requirements for J-R curve testing. It is shown that a considerable relaxation of the standard requirements is possible without affecting the reliability of the test result. This enables an effective and reliable testing of irradiated materials and structures whose dimensions inhibit the extraction of large specimens.

AB - Testing standards contain limitations on allowable J and crack growth, related to specimen size. In the case of unirradiated pressure vessel steel, it is usually possible to extract specimens of sufficient size to allow a standard determination of the J-R curve. However, in the case of irradiated materials, especially irradiated internals, it is normally not possible to use specimens that would provide valid results according to the standard requirement. This raises the question as to the relevance of the standard requirements. The size requirements stem from the dawn of elastic-plastic fracture mechanics. They have remained practically unchanged ever since, even though the understanding of elastic-plastic fracture mechanics and ductile fracture has evolved considerably. In this paper, the state-of-art understanding of the ductile fracture process, and elastic-plastic fracture mechanics is combined with experimental test results to derive new more realistic size requirements for J-R curve testing. It is shown that a considerable relaxation of the standard requirements is possible without affecting the reliability of the test result. This enables an effective and reliable testing of irradiated materials and structures whose dimensions inhibit the extraction of large specimens.

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Wallin K. Specimen size limitations in J-R curve testing: Standards versus reality. In ASTM Special Technical Publication. Vol. 1502 STP. American Society for Testing and Materials ASTM. 2007. p. 1-17