Quantitative NDT of Materials Density Based on the Composition by Industrial X-Ray Computed Tomography
-
摘要: 分析了材料组分、密度对射线衰减系数的影响，介绍了基于组分特性的材料密度工业X射线CT定量无损检测方法——线衰减系数对比法。以铝合金标准样品密度定量检测为例，研究了X射线“等效能量”的获取方法，建立了“等效能量”下CT值和线衰减系数的对应关系。通过线衰减系数和质量衰减系数实现了对铝合金材料密度的定量检测。试验研究表明，对于密度均匀的铝合金材料，基于组分特性的线衰减系数对比法测试精度明显优于密度对比法。Abstract: In this paper, the line attenuation coefficient affected by material composition and density was analyzed, the quantitative NDT method of materials density and the line attenuation coefficient comparison method based on materials composition by industrial X-ray computed tomography was described. As examples, the test method for X-ray CT systems equivalent energy measurement for some homogeneous aluminum alloy standard samples was studied, and the correlation of the CT value and the line attenuation coefficient at the equivalent energy was presented. With the help of the line attenuation coefficient and mass attenuation coefficient, the aluminum alloy materials densities could be determined. The experiment results showed that the measurement accuracy of density with the line attenuation coefficient comparison method based on materials composition characteristics was obviously better than density comparing method.
-
-
[1] Bossi R H, Georgeson G E. The application of X-ray computed tomography to materials development［J］. JOM,1991,43(9):723-728. [2] London B, Yancey R N, Smith J A. High-resolution X-ray computed tomography of composite materials［J］. Materials Evaluation,1990,48(5):604-608. [3] 杨文海，何得昌，徐军培，等.γ射线工业CT技术在高能炸药密度检测中的应用［J］.火炸药学报，2001,24(3):33-34,72. [4] 王珏，黄苏红，蔡玉芳.工业CT材料密度测量方法研究［J］.计算机工程与应用,2010,46(2):203-205. [5] 杨雪海，张伟斌，戴斌，等.含能材料密度的XCT自参照测试［J］.无损检测,2010,32(6):431-433. [6] CHEN Hui-neng, YANG Shu-bing. Study on the density characterization of the CT image［C］. 17th World Conference on Nondestructive Testing, Shanghai: 2008, China. [7] Kropas C V, Moran T J, Yancey R N. Effect of composition on density measurement by X-ray computed tomography［J］. Materials Evaluation, 1991, 49(4):487-489. [8] ASTM E1935—1997(2008)Standard Test Method for Calibrating and Meausring CT Density［S］. [9] 中国机械工程学会无损检测分会编.射线检测［M］.北京：机械工业出版社,2004:10-50. [10] 美国无损检测学会编.美国无损检测手册(射线卷)［M］.《美国无损检测手册》译审委员会译.上海：世界图书出版公司,1992:90-100. [11] 石磊,主编.探伤用射线防护技术［M］.北京机械工业出版社,1990:78-85. [12] Hubbell J H, Seltzer S M. Tables of X-ray mass attenuation coefficients and mass energy-absorption coefficients. 2005-2-16. http://physics.nist.gov/xaamdi.
计量
- 文章访问数: 3
- HTML全文浏览量: 0
- PDF下载量: 3
下载:
