Research on Advanced Nondestructive Evaluation (NDE) Methods for Materials, Process and Structures. Delivery Order 006: Computed Radiography Crack Detection Validation Study
Technical rept. 1 Aug 2009-1 Apr 2011
DAYTON UNIV RESEARCH INST (UDRI) OH
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The University of Dayton Research Institute UDRI was awarded the Computed Radiography Crack Detection Validation Study Program in August 2009. This program was a follow-on effort to a smaller study that compared the capability of film and computed radiography CR for the detection of cracks in representative aerospace structures. The goals of the new program were to expand on the previous study to include additional experimental variables in the assessment of detection capability, as well as to develop the guidelines, procedures, training materials, validation testing, and probability of detection POD studies required for implementation of CR into Air Force radiographic procedures for crack detection. The testing and analysis performed in support of these program goals are divided into three parts. First was to develop and conduct system performance tests using radiographic standards that could distinguish between CR systems with differing crack detection capability. Second was to develop a test matrix and conduct the laboratory testing required to determine the relative crack detection capability of at least three different CR systems as compared to film. A third aspect of the program was to design and conduct a POD study that would provide a quantitative assessment of the crack detection capability of representative Air Force radiographers using both CR imaging and film. This report describes the specimens created and test procedures followed in conducting the laboratory testing. A summary of the laboratory data and analysis results is also provided. The complete procedures, guidelines, and POD analysis report can be found in the references listed at the end of this report.