Neutron Diffraction Maps of Stress Concentration Near Notches Under Load at Temperature

[+] Author and Article Information
John H. Root, J. Katsaras

National Research Council of Canada, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0

John F. Porter

Defense Research Establishment Atlantic, HMC Dockyard, Halifax, Nova Scotia, Canada B3K 2X0e-mail: Porter@drea.dnd.ca

Brian W. Leitch

Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0e-mail: Leitchb@aecl.ca

J. Pressure Vessel Technol 124(3), 366-370 (Jul 26, 2002) (5 pages) doi:10.1115/1.1482407 History: Received December 19, 2000; Revised March 29, 2002; Online July 26, 2002
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Sketch of L3 neutron diffractometer
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Sketch of notched HY-100 bar in three-point bending configuration
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Maps of longitudinal strain (10−4), at various loading conditions: (a) 10×10−4, (b) 16.2×10−4, (c) 16.7×10−4, and (d) unloaded after 16.7×10−4
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Sketch of Zr-2.5Nb tensile specimen with semi-circular groove
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Neutron diffraction apparatus: (A) incident-beam slit, (B) load cell, (C) diffracted-beam slit, (D) XYZ translators, (E) Heater, (F) screw-driven cross-head
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Scan of crystal-lattice (elastic) strain versus depth below a blunt notch. Continuous and dashed lines are guides to the eye. Vertical bars indicate the typical measurement uncertainty ±σ.
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Peak broadening with time. Width is the Full-Width of a diffraction peak at half of its maximum height. Vertical bars indicate the typical measurement uncertainty ±σ. The dashed line shows the average peak width far from groove, at early times.



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