Development of an image analysis code for hydrided Zircaloy using Dijkstra's algorithm and sensitivity analysis of radial hydride continuous path

•PROPHET has been developed for RHF and RHCP analysis of hydrided Zircaloy•Dijkstra's algorithm finds the least-resistant path in hydrided Zircaloy well•Sensitivity of RHCP to magnification, resolution, fracture toughness, and position•Ductility of hydrided Zr is inversely correlated with RHCP•...

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Veröffentlicht in:Journal of nuclear materials Jg. 564; S. 153647
Hauptverfasser: Kim, Donguk, Kim, Dongyeon, Woo, Dahyeon, Lee, Youho
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Amsterdam Elsevier B.V 01.06.2022
Elsevier BV
Schlagworte:
Algorithms
Angular position
Dijkstra algorithm
Dijkstra's algorithm
Fracture toughness
Heat treating
Hydride embrittlement
Hydrides
Image analysis
Image processing
Image quality
Image resolution
Kernel functions
Mechanical properties
Noise sensitivity
Radial hydride continuous path
Radial hydride fraction
Sensitivity analysis
Zircaloys (trademark)
Zirconium
Zirconium hydride
Radial hydride fraction
Hydride embrittlement
Radial hydride continuous path
Zirconium hydride
Dijkstra algorithm
ISSN:0022-3115, 1873-4820
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Zusammenfassung:•PROPHET has been developed for RHF and RHCP analysis of hydrided Zircaloy•Dijkstra's algorithm finds the least-resistant path in hydrided Zircaloy well•Sensitivity of RHCP to magnification, resolution, fracture toughness, and position•Ductility of hydrided Zr is inversely correlated with RHCP•Kernel function can complement accuracy of RHCP analysis PROPHET, a software that conducts an image analysis of hydrided Zircaloy for Radial Hydride Fraction (RHF) and Radial Hydride Continuous Path (RHCP) evaluation using Dijkstra's algorithm was developed. Enabling autonomous image quality adjustment capability, and user-defined noise and hydride detection sensitivity control options, PROPHET instrumentally ensures limited sensitivity to potential variation in quality of the Optical Image (OM) and post-characterization of hydrided Zircaloy. Sensitivity analyses were conducted for magnification and resolution of OM, input fracture toughness, and employed algorithms. x200 and 0.8M (i.e., 1024×774) were recommended for magnification and image resolution, respectively. Fracture toughness ratio of 1:50 for hydride to Zr-matrix was confirmed to be a sound choice and RHCP exhibits limited sensitivity to fracture toughness around fracture toughness ratio input of 1:50. Algorithm has a large effect on RHCP. Dijkstra's algorithm exhibits unmatched fidelity to identifying the least-resistant path (hence maximum RHCP). RHCP and RHF exhibit notable varations along the angular positions of a homogenously distributed hydrides on the surface of a tubular Zircaloy. The uncertainties of RHCP and RHF due to spatial hydride distributions call for (1) multiple image analysis for a statistically reliable RHCP evaluation or (2) low magnification but ultrahigh resolution OM to capture the significant fraction, if not all, of the entire cladding surface of interest. RHCP successfully correlates strain energy density of hydrided Zircaloy with limited accuracy. Introduction of a kernel function which instrumentally adjusts the importance of one or more factors that affect the mechanical behavior of hydrided Zirclaoy (i.e., hydrogen amount or RHF) may complement the accuracy of prediction.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2022.153647