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放射光白色X線による内部き裂先端近傍のイメージングとひずみマッピングの検討

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

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*

An imaging and a strain mapping in the vicinity of crack tip in materials were investigated using high energy white X-ray obtained from BL28B2 beam line at SPring-8 Japan. Low-alloy and high-tensile steel (JIS G3128 SHY685) was used as a specimen shaped into G-type and introduced a fatigue crack into the beam of it. As the results, the imaging of the crack of the length of about 1mm in the specimen with loading of crack opening is practicable by using high energy synchrotron white X-ray. The plastic region estimated from the distribution of FWHM almost agreed with the theoretical value calculated by fracture mechanics. It was confirmed that the high energy white X-ray was useful for the imaging of the crack and the strain mapping in the vicinity of it in the depth of the order of millimeter.

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