Strain Analysis in Geological Materials Using Neutron Diffraction and AE Signal Measurement at J-PARC/BL19 "TAKUMI"

Jun Abe; Kotaro Sekine; Stefanus Harjo; Wu Gong; Kazuya Aizawa

doi:10.4028/www.scientific.net/MSF.777.219

Paper Titles

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Comparison of Synchrotron Radiation Diffraction and Micromagnetic Stress Analysis in Straightened Steel Pipes
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Synchrotron Diffraction Studies on the Transformation Strain in a High Strength Quenched and Tempered Structural Steel
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HomeMaterials Science ForumMaterials Science Forum Vol. 777Strain Analysis in Geological Materials Using...

Strain Analysis in Geological Materials Using Neutron Diffraction and AE Signal Measurement at J-PARC/BL19 "TAKUMI"

Abstract:

Acoustic emission (AE) is defined as a transient elastic wave generated by the rapid release of energy within a material. Crack initiation, phase transition and rupturing in rock materials are all detectable with the measurement of AE signals, and therefore such measurement helps to understand the underlying mechanism (s) of macroscopic deformation. In this study of the deformation mechanism (s) of rock samples, simultaneous measurements of the neutron diffraction pattern and AE signals were performed using the Engineering Materials Diffractometer TAKUMI at the Japan Proton Accelerator Research Complex (J-PARC). Two types of rock sample were tested in the experiments: sandstone and carbonate rock. A discrepancy was found between macroscopic strain (measured by strain gauge) and lattice strain (measured by neutron diffraction), and AE signals that would be generated by grain slip and pore collapse in rock samples were detected. Macroscopic strain in the rock samples was associated not only with lattice strain but also with mineral grain slip and pore collapse within the rock. The combination of AE signal measurements and neutron diffraction is an effective tool for investigating the deformation mechanisms of rock materials.

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Periodical:

Materials Science Forum (Volume 777)

Pages:

219-224

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.777.219

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Online since:

February 2014

Authors:

Jun Abe, Kotaro Sekine, Stefanus Harjo, Wu Gong, Kazuya Aizawa

Keywords:

Acoustic Emission (AE), Compression Test, Neutron Diffraction, Rock Material, Time-of-Flight

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