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This document provides guidance from within the Adhesives and Interfaces Research Team of the Coatings, Corrosion, & Engineered Polymers Branch (CCEPB) and the U.S. Army Research Laboratory (ARL) for initial performance-based screening evaluation and grouping priority assignments/categorization of candidate adhesives for high-loading-rate applications relevant to U.S. Army needs. 15. SUBJECT TERMS adhesive, testing, single lap joint, high loading rate, database, metadata, material pedigree 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT UU 18. NUMBER OF PAGES 20 19a. NAME OF RESPONSIBLE PERSON Branch line (or see block 13) a. REPORT

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The application of a noncontact air coupled acoustic heating technique is investigated for the inspection of advanced honeycomb composite structures. A weakness in the out of plane stiffness of the structure, caused by a delamination or core damage, allows for the coupling of acoustic energy and thus this area will have a higher temperature than the surrounding area. Air coupled acoustic thermography (ACAT) measurements were made on composite sandwich structures with damage and were compared to conventional flash thermography. A vibrating plate model is presented to predict the optimal acoustic source frequency. Improvements to the measurement technique are also discussed.