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

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

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.