301不锈钢模拟裂纹可探测性的数字射线照相研究

IF 1 4区 工程技术 Q4 INSTRUMENTS & INSTRUMENTATION Insight Pub Date : 2023-09-01 DOI:10.1784/insi.2023.65.9.508
P M Adams, S Kenderian, A Gregorian
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引用次数: 0

摘要

本研究在301不锈钢(SS)中制造了一系列由深度为板厚12.8% ~ 40%的裂缝组成的模拟裂纹。检查包括一个微聚焦x射线管和一个0.075 mm像素的数字探测器阵列(DDA),三个入射角(0°,5°和10°)。最小可检测狭缝宽度方法的基础源于图像中的噪声统计和最小可检测的噪比(CNR)为3。在0°入射条件下,当狭缝深度分别为12.8%和40.0%时,最小可检测宽度范围为0.019 mm至0.003 mm。当入射角增加到10°时,最小可探测狭缝宽度的大小也会增加,对于较浅的狭缝,可以增加两倍。值得注意的是,这些模拟裂缝具有直的平行边和平坦的底部,不能准确地代表具有不规则路径和深度锥度的自然裂缝。因此,本研究的结果代表了检测的最佳方案,建立了一些裂缝宽度可检测性的界限。
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A digital radiography study of the detectability of simulated cracks in 301 stainless steel
A series of simulated cracks in 301 stainless steel (SS), consisting of slits with depths from 12.8% to 40% of the plate thickness, is fabricated in this study. The examination includes a microfocus X-ray tube and a digital detector array (DDA) with 0.075 mm pixels at three angles of incidence (0°, 5° and 10°). The basis of the methodology for the minimum detectable slit width stems from the noise statistics in the images and a minimum detectable contrast-to-noise ratio (CNR) of 3. These minimum detectable widths range from 0.019 mm to 0.003 mm for 12.8%-deep and 40.0%-deep slits, respectively, for the 0° incidence condition. As the incident angle increases to 10°, the size of the minimum detectable slit width also increases, up to a factor of two for the shallower slits. It is noted that these simulated cracks, which have straight parallel sides and flat bottoms, do not accurately represent natural cracks that have irregular paths and taper at depth. Therefore, the results in this study represent the best scenario for detection, establishing some bounds of crack width detectability.
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来源期刊
Insight
Insight 工程技术-材料科学:表征与测试
CiteScore
1.50
自引率
9.10%
发文量
0
审稿时长
2.8 months
期刊介绍: Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
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