Numerical modeling of ductile tearing effects on cleavage fracture toughness

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Experimental studies demonstrate a significant effect of specimen size, a/W ratio and prior ductile tearing on cleavage fracture toughness values (J{sub c}) measured in the ductile-to-brittle transition region of ferritic materials. In the lower-transition region, cleavage fracture often occurs under conditions of large-scale yielding but without prior ductile crack extension. The increased toughness develops when plastic zones formed at the crack tip interact with nearby specimen surfaces which relaxes crack-tip constraint (stress triaxiality). In the mid-to-upper transition region, small amounts of ductile crack extension (often < 1-2 mm) routinely precede termination of the J-{Delta}a curve by brittle fracture. Large-scale yielding, ... continued below

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33 p.

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Dodds, R. H. Jr.; Tang, M. & Anderson, T. L. May 1, 1994.

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Description

Experimental studies demonstrate a significant effect of specimen size, a/W ratio and prior ductile tearing on cleavage fracture toughness values (J{sub c}) measured in the ductile-to-brittle transition region of ferritic materials. In the lower-transition region, cleavage fracture often occurs under conditions of large-scale yielding but without prior ductile crack extension. The increased toughness develops when plastic zones formed at the crack tip interact with nearby specimen surfaces which relaxes crack-tip constraint (stress triaxiality). In the mid-to-upper transition region, small amounts of ductile crack extension (often < 1-2 mm) routinely precede termination of the J-{Delta}a curve by brittle fracture. Large-scale yielding, coupled with small amounts of ductile tearing, magnifies the impact of small variations in microscale material properties on the macroscopic fracture toughness which contributes to the large amount scatter observed in measured J{sub c}-values. Previous work by the authors described a micromechanics fracture model to correct measured J{sub c}-values for the mechanistic effects of large-scale yielding. This new work extends the model to also include the influence of ductile crack extension prior to cleavage. The paper explores development of the new model, provides necessary graphs and procedures for its application and demonstrates the effects of the model on fracture data sets for two pressure vessel steels (A533B and A515).

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33 p.

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INIS; OSTI as TI94015146; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

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  • Other Information: PBD: May 1994

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  • Other: TI94015146
  • Report No.: NUREG/CR--6162
  • Report No.: UILU-ENG--93-2014
  • DOI: 10.2172/10166576 | External Link
  • Office of Scientific & Technical Information Report Number: 10166576
  • Archival Resource Key: ark:/67531/metadc1346913

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  • May 1, 1994

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  • Nov. 28, 2018, 2:33 p.m.

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Dodds, R. H. Jr.; Tang, M. & Anderson, T. L. Numerical modeling of ductile tearing effects on cleavage fracture toughness, report, May 1, 1994; United States. (https://digital.library.unt.edu/ark:/67531/metadc1346913/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.