ASTM_E_2661_-_E_2661M_-_15.pdf

Designation:E2661/E2661M15Standard Practice forAcoustic Emission Examination of Plate-like and Flat PanelComposite Structures Used in Aerospace Applications1This standard is issued under the fixed 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 fiber/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 fiber 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 fiber 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 GPa3 Msi fibers.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E543 Specification for Agencies Performing NondestructiveTestingE976 Guide for Determining the Reproducibility ofAcousticEmission Sensor ResponseE1067 Practice forAcoustic Emission Examination of Fiber-glass Reinforced Plastic Resin(FRP)Tanks/VesselsE1106 Test Method for Primary Calibration of AcousticEmission SensorsE1316 Terminology for Nondestructive ExaminationsE1781 Practice for Secondary Calibration of Acoustic Emis-sion SensorsE2533 Guide for Nondestructive Testing of Polymer MatrixComposites Used in Aerospace Applications2.2 Other Documents:ANSI/ASNT CP-189 ASNT Standard for Qualification andCertification of Nondestructive Testing Personnel3ISO 9712 Non-destructive TestingQualification and Cer-tification of NDT Personnel4NAS-410 NAS Certification and Qualification of Nonde-structive Personnel(Quality Assurance Committee)5SNT-TC-1A Recommended for Personnel Qualification andCertification of Nondestructive Testing Personnel33.Terminology3.1 DefinitionsSee Terminology E1316 for general termi-nology applicable to this practice.1This 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 June 1,2015.Published July 2015.Originally approvedin 2010.Last previous edition approved in 2010 as E2661/E2661M-10.DOI:10.1520/E2661_E1661M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.4Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,CP 56,CH-1211 Geneva 20,Switzerland,http:/www.iso.org.5Available from Aerospace Industries Association of America,Inc.,1250 EyeSt.,NW,Washington,DC 20005.*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 States1 3.2 Definitions of Terms Specific to This Standard:3.2.1 characteristic damage statetransverse matrix crack-ing during the virgin loading of a composite;often resulting inreaching a limit of the crack density prior to reaching failure.Resul