Neutron Bragg-edge-imaging for strain mapping under in situ tensile loading

Journal of Applied Physics - Tập 109 Số 9 - 2011
Robin Woracek1,2, Dayakar Penumadu2, Nikolay Kardjilov1, André Hilger1, Markus Ströbl1, Robert C. Wimpory1, Ingo Manke1, John Banhart1
1Helmholtz Zentrum Berlin 2 , Hahn Meitner Platz 1, D-14109 Berlin, Germany
2University of Tennessee, CEE Department 1 , 223 Perkins Hall, Knoxville, Tennessee 37996, USA

Tóm tắt

Wavelength selective neutron radiography at a cold neutron reactor source was used to measure strain and determine (residual) stresses in a steel sample under plane stress conditions. We present a new technique that uses an energy-resolved neutron imaging system based on a double crystal monochromator and is equipped with a specially developed (in situ) biaxial load frame to perform Bragg edge based transmission imaging. The neutron imaging technique provides a viewing area of 7 cm by 7 cm with a spatial resolution on the order of ∼ 100 μm. The stress-induced shifts of the Bragg edge corresponding to the (110) lattice plane were resolved spatially for a ferritic steel alloy A36 (ASTM international) sample. Furthermore it is demonstrated that results agree with comparative data obtained using neutron diffraction and resistance based strain-gauge rosettes.

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Journal of Applied Physics

Tập 109 Số 9

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