Phase contrast stereometry: fatigue crack mapping in three dimensions
Phase contrast stereometry: fatigue crack mapping in three dimensions
复制标题
相衬立体测量：三维疲劳裂纹测绘
DOI：
10.1080/14786430500155387
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发表时间：
2005
影响因子：
1.6
通讯作者：
S. R. Stock *
中科院分区：
文献类型：
--
作者：
K. Ignatiev;W.;K. Fezzaa;S. R. Stock *
下面报告的工作描述了一种新的方法，称为X射线相衬立体测量，用于重建的三维（3D）的标本内的功能的位置的发展。该方法需要测量的位置，一个给定的功能在相位显微射线照片记录在不同的视角和细化功能的位置数字。该方法旨在解决传统实验室或同步加速器X射线吸收显微计算机断层扫描（microCT）的局限性，特别是那些固有的研究板状样品。相位立体重建技术被施加到一个小的紧凑的拉伸样品的铝合金AA 2090（20.3毫米宽，从缺口尖端到背面和2.7毫米厚）含有疲劳裂纹，并用于映射的3D裂纹表面非侵入性。在大约2.7 mm × 6.0 mm的表面上映射2269个点，每个点使用多达10个视角。三维立体测量得到的裂纹表面与同一样品的吸收显微CT表面图一致。相位技术是上级在其裂纹敏感性方面，相位图像允许裂纹被跟踪到其尖端，即使施加零载荷，而吸收microCT只能检测到约5毫米的裂纹6毫米长时，加载到40公斤力。用于立体测量映射的对比度的起源被证实是从裂纹面上的峰;从第二个（完整的）样品的相位显微射线照片显示出与当样品被劈开时在表面上显示的特征相同的图案。作为原位负载的函数的裂纹开口测量裂纹表面上的相同点，使用相位立体测量和吸收microCT的开口是在良好的协议。
The work reported below describes development of a novel method, termed X-ray phase contrast stereometry, for reconstructing the three-dimensional (3D) positions of features within a specimen. The approach takes measured positions of a given feature in phase microradiographs recorded at different viewing angles and refines that feature's position numerically. The approach is designed to address limitations in conventional laboratory or synchrotron X-ray absorption micro computed tomography (microCT), particularly those inherent in studying plate-like samples. The phase stereometric reconstruction technique was applied to a small compact tension sample of aluminium alloy AA 2090 (20.3 mm wide from notch tip to back face and 2.7 mm thick) containing a fatigue crack and was used to map the 3D crack surface non-invasively. Up to ten viewing angles were used for each of 2269 points mapped on the approximately 2.7 mm × 6.0 mm surface. The 3D stereometry-derived crack surface agreed with the surface map from absorption microCT of the same sample. The phase technique was superior in terms of its crack sensitivity; the phase images allowed the crack to be followed to its tip, even with zero applied load while absorption microCT could only detect about 5 mm of the crack 6 mm long when loaded to 40 kgf. The origin of the contrast used for stereometric mapping was confirmed to be from the peaks on the crack face; phase microradiographs from a second (intact) sample showed a pattern of features identical with those revealed on the surface when the sample was split open. Crack opening as a function of in-situ load was measured for the same points on the crack surface using both phase stereometry and absorption microCT; the openings were in good agreement.
影响因子：
3
作者：
Stock, SR;Ignatiev, KI;De Carlo, F
通讯作者：
De Carlo, F