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Acoustic emission analysis and micro-mechanical interpretation of mode I fracture toughness tests on composite materials

  • Mode I fracture toughness tests on Double Cantilever Beam specimens from carbon-fibre and glassfibre reinforced polymer-matrix composites were monitored with Acoustic Emission (AE) and loaddisplacement traces and delamination lengths were recorded. AE characterized the kinetics of delamination propagation. The progress of AE activity and AE intensity with load and AE source location plots are used to determine the delamination onset on the microscopic and macroscopic scale. Energy dissipating processes initiated in the damage zone near the delamination tip. Low Interface adhesion results in lower debonding stresses and larger damage zones compared with composites with good adhesion. Time-dependent linear location of AE sources yields the average length of the damage zone and the average speed of delamination propagation. Parameter analysis has been used empirically for identifying AE source mechanisms. A new Classification Software for transient AE waveforms permits identification ofMode I fracture toughness tests on Double Cantilever Beam specimens from carbon-fibre and glassfibre reinforced polymer-matrix composites were monitored with Acoustic Emission (AE) and loaddisplacement traces and delamination lengths were recorded. AE characterized the kinetics of delamination propagation. The progress of AE activity and AE intensity with load and AE source location plots are used to determine the delamination onset on the microscopic and macroscopic scale. Energy dissipating processes initiated in the damage zone near the delamination tip. Low Interface adhesion results in lower debonding stresses and larger damage zones compared with composites with good adhesion. Time-dependent linear location of AE sources yields the average length of the damage zone and the average speed of delamination propagation. Parameter analysis has been used empirically for identifying AE source mechanisms. A new Classification Software for transient AE waveforms permits identification of the source mechanism of individual AE signals. A micro-mechanical fracture model based on the AE results describes the contributions of microscopic matrix and Interface mechanisms to the interlaminar fracture energy.zeige mehrzeige weniger

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Metadaten
Autor*innen:Jürgen Bohse, Torsten Krietsch, J. H. Chen, A. J. Brunner
Persönliche Herausgeber*innen:J. G. Williams, A. Pavan
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Fracture of polymers, composites, and adhesives
Jahr der Erstveröffentlichung:2000
Herausgeber (Institution):European Structural Integrity Society
Verlag:Elsevier
Verlagsort:Amsterdam
Ausgabe/Heft:27
Erste Seite:15
Letzte Seite:26
Freie Schlagwörter:Acoustic emission analysis; DCB test; Damage zone; Interface adhesion; Interlaminar fracture energy; Micro-mechanical fracture model; Micro-mechanisms; Mode I; Polymer composites
Veranstaltung:2nd ESIS TC4 Conference on Fracture of Polymers, Composites, and Adhesives
Veranstaltungsort:Les Diablerets, Switzerland
Beginndatum der Veranstaltung:13.09.1999
Enddatum der Veranstaltung:15.09.1999
ISSN:1566-1369
ISBN:0-08-043710-9
Bemerkung:
Serientitel: ESIS publication – Series title: ESIS publication
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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