Observation of Internal Crack of Steel Bar by Computed Tomography and Strain Mapping near Its Tip Using Synchrotron White X-Ray
Observation of Internal Crack of Steel Bar by Computed Tomography and Strain Mapping near Its Tip Using Synchrotron White X-Ray
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利用计算机断层扫描和同步加速器白光 X 射线尖端附近的应变映射观察钢筋内部裂纹
DOI：
10.2472/jsms.58.596
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Michiaki Kobayashi
中科院分区：
文献类型：
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作者：
J. Shibano;K. Kiriyama;K. Kajiwara;T. Shobu;Kenji Suzuki;Takayuki Arai;S. Miura;Michiaki Kobayashi
用BL28B2束线在日本SPRING-8获得的白X射线，对钢的内部裂纹进行了CT观察和尖端附近的应变图研究。用一种低合金钢和高强度钢作为试件，在直径为5 mm的平行部分拉杆中制备试件。在脉动拉伸载荷(应力比R=0)作用下，试件产生疲劳裂纹。利用能间接探测穿透试件的X射线的CCD相机对试件中的裂纹进行CT观察。为了利用能量色散X射线衍射技术测量应变，将高100μm、宽100μm的同步加速器白X射线束入射到布拉格角θ为5度的试件上。结果表明，在拉伸载荷作用下，利用X射线白光CT可以观察到试件中的裂纹。CT的分辨率约为18μm~3，远低于先前报道的单色X射线。在裂纹尖端附近测得了较大的拉应变。然而，与圆形分布的裂纹尖端相比，在细长规范体积的影响下，裂纹尖端相对较小。结果表明，由于应变分布的急剧变化，在裂纹尖端附近测得的X射线衍射面的半高宽增大。
Observation of the internal crack of steel by a computed tomography (CT) and strain mapping near its tip were investigated using a white X-ray obtained from BL28B2 beam line at SPring-8 in Japan. A low-alloy and high-tensile steel was used as a specimen prepared in the tensile bar with a parallel part of 5mm diameter. A fatigue crack was introduced into the specimen under the pulsating tension load (stress ratio R = 0). CT observation of the crack in the specimen was carried out by using the CCD camera that can detect indirectly the X-ray transmitted through the specimen. To measure the strain using the energy dispersive X-ray diffraction technique, the synchrotron white X-ray beam, which had a height of 100μm and a width of 100μm, was incident on the specimen with the Bragg angle θ of 5 degrees. As a result, the crack in the specimen under the tensile loading could be observed by the CT using the white X-ray. The resolution of CT, which was about 18μm3, was considerably lower than it using a monochromatic X-ray reported previously. The large tensile strain was measured near the crack tip. It was, however, relatively small under the influence of the long slender gauge volume as compared with the crack tip distributed circularly. It was confirmed that the FWHM of diffracted X-ray profile measured near the crack tip was increased due to the steep change in the strain distribution.
利用同步子辐射计算机断层扫描对铝合金疲劳裂纹进行成像
DOI：
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发表时间：
2007
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作者：
Y. Sano;K. Masaki;K. Akita;Y. Ochi;K. Kajiwara
通讯作者：
K. Kajiwara
使用同步辐射测量超细晶钢缺口和疲劳裂纹附近的应力分布
DOI：
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发表时间：
2004
期刊：
材料 53・7
影响因子：
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作者：
田野 誠;秋庭 義明
通讯作者：
秋庭 義明
Tada, H.：“感觉形态和精神负荷对眨眼率的影响。”
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