Design of Experiment Approach to Hydrogen Re-embrittlement Evaluation WP-2152

Report No. ARL-TR-7275
Authors: Scott M Grendah; Hoang Nguyen; Franklin Kellogg; Shuying Zhu; Stephen Jones
Date/Pages: April 2015; 64 pages
Abstract: A 3-phase design-of-experiment approach was used to investigate hydrogen re-embrittlement effects of common aviation maintenance chemicals and coatings. Both material and geometry were examined to uncover the best constraints for a novel method. While traditional testing uses a pass/fail approach, the developed method employed load monitoring cells over a range of material strength, hydrogen-emitting environment, and applied load. This method allowed prospective solvent replacement chemicals and cadmium replacement coatings to be finely delineated in terms of performance and formed the basis of a tool for predicting time to failure under any combination of parameters. In the aviation community, heavy restriction on using alternative chemicals and coatings could therefore be eased, and applications could be expanded for using high-strength steel.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2015