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Journal Articles

Effect of gauge volume on strain measurement in rock materials using time-of-flight neutron diffraction

Abe, Jun*; Sekine, Kotaro*; Harjo, S.; Kawasaki, Takuro; Aizawa, Kazuya

Physica B; Condensed Matter, 551, p.283 - 286, 2018/12

 Times Cited Count:0 Percentile:100(Physics, Condensed Matter)

Journal Articles

Strain analysis in Geological materials using Neutron diffraction and AE signal measurement at J-PARC/BL19 "TAKUMI"

Abe, Jun*; Sekine, Kotaro*; Harjo, S.; Gong, W.; Aizawa, Kazuya

Materials Science Forum, 777, p.219 - 224, 2014/02

 Times Cited Count:2 Percentile:18.56

Oral presentation

Strain measurements of rock samples using neutron diffraction at J-PARC/TAKUMI

Abe, Jun; Sekine, Kotaro*; Harjo, S.; Ito, Takayoshi*; Arima, Hiroshi

no journal, , 

The Engineering Materials Diffractometer "TAKUMI", which was constructed at BL19 in MLF, was designed to research the stress of engineering materials. While the stress measurements using diffraction technique has been focused mostly on metals, the application to geological materials was examined. The aim of this study is to develop neutron diffraction technique applicable to the geological materials. Measurements of residual strain in a rock sample and in situ strain measurement on specimens under uniaxial compression have been performed at TAKUMI. Measurements of residual strain in a rock sample revealed that the anisotropy of strain value in respect to the direction. In the in situ strain measurements experiment, discrepancy was found in values obtained by strain gauge and quartz lattice spacing.

Oral presentation

Strain measurements in rock samples using neutron diffraction

Abe, Jun; Sekine, Kotaro*; Harjo, S.; Ito, Takayoshi*; Arima, Hiroshi; Aizawa, Kazuya

no journal, , 

Strain measurements using neutron diffraction are based on Bragg's law. Tensile or compressive stress causes change in lattice spacing, which results in peak shift of Bragg peak. Strain value can be derived from this peak shift value. Since neutron penetrate materials more than X-rays, the strain inside the material could be obtained nondestructively using neutron diffraction technique. While the stress measurements using diffraction technique has been focused mostly on metals, the application to geological materials was examined. The aim of this study is to develop neutron diffraction technique applicable to the geological materials. In situ strain measurement on specimens under uniaxial compression have been performed at "TAKUMI". Sufficient neutron diffraction patterns could be obtained. This indicates that the strain distribution in rocks is nondestructively measurable using "TAKUMI".

Oral presentation

Strain measurement in geological material with engineering materials diffractometer (BL-19) at J-PARC

Abe, Jun; Sekine, Kotaro*; Harjo, S.; Ito, Takayoshi*; Arima, Hiroshi*; Aizawa, Kazuya

no journal, , 

This study aims at the development of neutron diffraction technique of geological materials. Measurements of residual strain in a rock sample and in situ strain measurement on rock specimens under uniaxial compression have been performed at the engineering materials diffractometer at J-PARC. In the residual strain measurements, anisotropy of strain value in respect to the direction was found. On the other hand, in the in situ strain measurements, diffraction peaks shifted to lower value depend on compressive load. The engineering materials diffractometer at J-PARC has potential ability to clarify strain distribution inside rock specimen nondestructively. In situ strain measurements on rock specimens under various conditions will provide us a new insight into rock deformation and rock fracturing mechanism.

Oral presentation

Strain measurement in geological materials using neutron diffraction

Abe, Jun; Sekine, Kotaro*; Harjo, S.; Ito, Takayoshi*; Arima, Hiroshi*; Aizawa, Kazuya

no journal, , 

This study aims at the development of neutron diffraction technique of geological materials. Measurements of residual strain in a rock sample and in situ strain measurement on rock specimens under uniaxial compression have been performed at the Engineering Materials Diffractometer at J-PARC. In the residual strain measurements, anisotropy of strain value in respect to the direction was found. On the otherhand, in the in situ strain measurements, diffraction peaks shifted to lower value depend on compressive load. The Engineering Materials Diffractometer at J-PARC has potential ability to clarify strain distribution inside rock specimen nondestructively. In situ strain measurements on rock specimens under various conditions will provide us a new insight into rock deformation and rock fracturing mechanism.

Oral presentation

Strain measurements in geological material using neutron diffraction

Abe, Jun; Sekine, Kotaro*; Harjo, S.; Gong, W.; Aizawa, Kazuya

no journal, , 

Residual strain measurements in Borehole rock specimen were performed at Engineering Material Diffractometer "TAKUMI" in J-PARC. Lattice parameter of Quartz were varied with measurement gauge position. This indicated that residual tensile strain might be formed at around sample center.

Oral presentation

Strain analysis in Rock samples using Neutron diffraction at J-PARC/BL19 "TAKUMI"

Abe, Jun; Sekine, Kotaro*; Harjo, S.; Gong, W.; Aizawa, Kazuya

no journal, , 

In order to utilize underground environment, e.g. CCS, accurate estimate of crustal stress is indispensable. Rock sample might have residual strain corresponding to crustal stress the sample was taken. Neutron diffraction measurements of the rock sample have been performed, and we have attempted to analyze residual strain in the sample. It was speculated that quartz grains contain tensile strain, on the other; feldspar grain contains compression strain. Residual strain in the rock sample might become helpful to estimate states of the crustal stress where the sample was taken. Therefore, it is expected that strain measurements using neutron diffraction serve to understanding of stress state in underground environment.

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