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John H. Grubbs


Click on the titles below to find US government-authored or -collected reports written by John H. Grubbs

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Applications of Digital Image Processing in Testing and Evaluation of Composite Materials MAY 90 21 pages
Authors:  Gary L. Hagnauer; James D. Kleinmeyer; John J. Wixted; John H. Grubbs; ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
The full text of this report is available for sale.This report describes the development and application of digital image processing techniques for analyzing the fracture behavior and environmental deterioration of test specimens prepared from composite laminate materials used in the manufacture of helicopter rotor blades. The digitized images were evaluated using pixel histograms generated through routines developed on a C-interpreter. Laminate fiber orientation and aging conditions were found to have a significant effect on the observed fracture patterns and ...


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