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Designation: E2661/E2661M − 26Standard Practice forAcoustic Emission Examination of Plate-like and Flat PanelComposite Structures Used in Aerospace Applications 1This standard is issued under the f i xed designation E2661/E2661M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers acoustic emission (AE) examina-tion or monitoring of panel and plate-like composite structuresmade entirely of f i ber/polymer composites.1.2 The AE examination detects emission sources andlocates the region(s) within the composite structure where theemission originated. When properly developed AE-based cri-teria for the composite item are in place, the AE data can beused for nondestructive examination (NDE), characterizationof proof testing, documentation of quality control, or fordecisions relative to structural-test termination prior to comple-tion of a planned test. Other NDE methods may be used toprovide additional information about located damage regions.For additional information, see X1.1 in Appendix X1.1.3 This practice can be applied to aerospace compositepanels and plate-like elements as a part of incoming inspection,during manufacturing, after assembly, continuously (duringstructural health monitoring), and at periodic intervals duringthe life of a structure.1.4 This practice is meant for f i ber orientations that includecross-plies, angle-ply laminates, or two-dimensional wovenfabrics. This practice also applies to 3-D reinforcement (forexample, stitched, z-pinned) when the f i ber content in the thirddirection is less than 5 % (based on the whole composite).1.5 This practice is directed toward composite materials thattypically contain continuous high modulus greater than 20 GPa[3 Msi] f i bers.1.6 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. Thevalues stated in each system are not necessarily exact equiva-lents; therefore, to ensure conformance with the standard, eachsystem shall be used independently of the other, and valuesfrom the two systems shall not be combined.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2E543 Specif i cation for Agencies Performing NondestructiveTestingE976 Guide for Determining the Reproducibility ofAcousticEmission Sensor ResponseE1067/E1067M Practice forAcoustic Emission Examinationof Fiberglass Reinforced Plastic Resin (FRP) Tanks/VesselsE1106 Test Method for Primary Calibration of AcousticEmission SensorsE1316 Terminology for Nondestructive ExaminationsE1781/E1781M Practice for Secondary Calibration ofAcoustic Emission SensorsE2533 Guide for Nondestructive Examination of PolymerMatrix Composites Used in Aerospace Applications3. Terminology3.1 Def i nitions—See Terminology E1316 for general termi-nology applicable to this practice.3.2 Def i nitions of Terms Specif i c to This Standard:3.2.1 characteristic damage state, n—transverse matrixcracking during the virgin loading of a composite; oftenresulting in reaching a limit of the crack density prior toreaching failure.1 This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.04 onAcoustic Emission Method.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 2010. Last previous edition approved in 2020 as E2661/E2661M – 20 ?1 .DOI:10.1520/E2661_E2661M-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1