Transmission imaging and strain mapping in the vicinity of internal crack tip using synchrotron white X-ray

放射光白色X線による内部き裂先端部のイメージング及びひずみ分布

柴野 純一*; 梶原 堅太郎*; 桐山 幸治*; 菖蒲 敬久  ; 鈴木 賢治*; 西村 優*; 三浦 節男*; 小林 道明*

Shibano, Junichi*; Kajiwara, Kentaro*; Kiriyama, Koji*; Shobu, Takahisa; Suzuki, Kenji*; Nishimura, Suguru*; Miura, Setsuo*; Kobayashi, Michiaki*

A transmission imaging and a strain mapping in the vicinity of a crack tip in steel were investigated using a high energy white X-ray obtained from BL28B2 beam line at SPring-8 in Japan. Low-alloy and high-tensile steel was used as a specimen prepared in the G-type geometry with a rectangular sectional part of 5 mm thickness for a four-point bending. As the results, the transmitted image of the crack showed that the crack in the specimen was propagated deeper than that on the surface. It became clear by the numerical simulation that the FWHM of diffracted X-ray profile measured near the crack tip was increased due to the steep change in the strain distribution. It was confirmed that the synchrotron white X-ray was useful for the imaging of the internal crack and the strain mapping near it.