High-temperature crack-arrest tests using 152-mm-thick SEN wide plates of low-upper-shelf base material: Tests WP-2. 2 and WP-2. 6

Technical Report · Thu Feb 01 00:00:00 EST 1990

DOI:https://doi.org/10.2172/7258827· OSTI ID:7258827

Naus, D. J.; Keeney-Walker, J.; Bass, B. R.; Iskander, S. K. ^[1]; Fields, R. J.; deWit, R.; Low, III, S. R. ^[2]

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1. Oak Ridge National Lab., TN (USA)
2. National Inst. of Standards and Technology, Gaithersburg, MD (USA)

Two 152-mm-thick wide-plate crack-arrest tests (WP-2 series) are discussed in this report. Each test used a 1 {times} 1 {times} 0.15 m thick single-edge-notch specimen (a/w = 0.2), fabricated from a low-upper-shelf base material, that was subjected to a linear thermal gradient along the plane of crack propagation. The tests were conducted at the National Institute of Standards and Technology and were designed to provide fracture-toughness measurements at temperatures approaching or above the onset of the Charpy upper-shelf regime in a rising toughness region and with an increasing driving force. Results obtained from these tests have produced crack-arrest toughness values well above the limit recognized by the current ASME guidelines (220 MPa {center dot} {radical}m) with arrests occurring at 44 to 102{degrees}C above the material DW{sub NDT} (60{degrees}C). The fracture data support (1) the use of fracture mechanics concepts to analyze cleavage run-arrest events, (2) the treatment of cleavage run-arrest and ductile fracture modes as separate events, and (3) the fact that cleavage arrest occurs above the ASME limit. 124 refs., 83 figs., 18 tabs.

• Research Organization: US Nuclear Regulatory Commission (NRC), Washington, DC (United States). Div. of Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); National Inst. of Standards and Technology, Gaithersburg, MD (USA)
• Sponsoring Organization: USNRC
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7258827
• Report Number(s): NUREG/CR-5450; ORNL/TM-11352; ON: TI90007786; TRN: 90-008875
• Country of Publication: United States
• Language: English

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