ASTM E2661/E2661M
Scope
1.1 This practice covers acoustic emission (AE) examination or monitoring of panel and plate-like composite structures made entirely of fiber/polymer
composites.
1.2 The AE examination detects emission sources and locates the region(s) within the composite structure where the emission originated. When properly
developed AE-based criteria for the composite item are in place, the AE data can be used for nondestructive examination (NDE), characterization of proof testing, documentation of quality
control, or for decisions relative to structural-test termination prior to completion of a planned test. Other NDE methods may be used to provide additional information about located damage
regions. For additional information, see X1.1 in Appendix X1.
1.3 This practice can be applied to aerospace composite panels and plate-like elements as a part of incoming inspection, during manufacturing, after
assembly, continuously (during structural health monitoring), and at periodic intervals during the life of a structure.
1.4 This practice is meant for fiber orientations that include cross-plies, angle-ply laminates, or two-dimensional woven fabrics. This practice also
applies to 3-D reinforcement (for example, stitched, z-pinned) when the fiber content in the third direction is less than 5 % (based on the whole composite).
1.5 This practice is directed toward composite materials that typically contain continuous high modulus greater than 20 GPa [3 Msi] fibers.
1.6 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The
values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the
two systems shall not be combined.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on
Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Keywords
acoustic emission (AE); acoustic emission from composites; AE; aerospace composites; continuous fibers; fiber/polymer composites; flat panels; high modulus fibers; laminates; nondestructive
testing (NDT); structural health monitoring (SHM);
ICS Code
ICS Number Code 49.025.40 (Rubber and plastics)
DOI: 10.1520/E2661_E2661M-20E01