Fracture experiments with cracked and embrittled hexcan sections

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Crack-like flaws that might exist in hexagonal subassembly ducts are not generally expected to initiate brittle fracture, but there is reason to be concerned about the integrity of cracked hexcans that have been severely embrittled by fast-neutron irradiation. In order to check the applicability of linear elastic fracture mechanisms analysis to such ducts, a program of experiments with deliberately cracked and embrittled hexcan sections has been undertaken. Type 446 stainless steel was used for the test sections because this material may be heat treated to alter its room-temperature mechanical properties to such an extent that they simulate those of irradiated ... continued below

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Pages: 15

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Petroski, H.J. & Yamada, H. January 1, 1979.

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Description

Crack-like flaws that might exist in hexagonal subassembly ducts are not generally expected to initiate brittle fracture, but there is reason to be concerned about the integrity of cracked hexcans that have been severely embrittled by fast-neutron irradiation. In order to check the applicability of linear elastic fracture mechanisms analysis to such ducts, a program of experiments with deliberately cracked and embrittled hexcan sections has been undertaken. Type 446 stainless steel was used for the test sections because this material may be heat treated to alter its room-temperature mechanical properties to such an extent that they simulate those of irradiated 20% cold-worked Type 316 stainless steel at reactor operating temperature. Although these different materials are not metallurgically comparable in their fracture properties, the structural response of hexcan sections fabricated from Type 446 may be assumed similar to that of irradiated Type 316 stainless steel hexcans. A series of experiments involving several different crack depths at either the corners or midflats of hexcan sections has been begun. After heat treatment and fatigue-sharpening of the cracks, the duct sections were loaded at two opposite midflats, and the load vs crack opening displacement was recorded for each test. Earlier analytical work provides stress intensity factor calibrations for the test conditions, and these calibrations enable one to predict analytically the load at which brittle fracture could occur. In this paper, a comparison of these analytical predictions and experimental results will be made and discussed.

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Pages: 15

Notes

Dep. NTIS, PC A02/MF A01.

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  • International conference on structural mechanics in reactor technology, Berlin, F.R. Germany, 13 Aug 1979

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  • Report No.: CONF-790802-51
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 5855001
  • Archival Resource Key: ark:/67531/metadc1094862

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 18, 2018, 6:50 p.m.

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Petroski, H.J. & Yamada, H. Fracture experiments with cracked and embrittled hexcan sections, article, January 1, 1979; Illinois. (digital.library.unt.edu/ark:/67531/metadc1094862/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.