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Limits in the determination of mechanical properties of composites by off-axis tests

  • Off-axis tests are widely used for the determination of the anisotropic mechanical properties of composite materials, this is, the longitudinal E-modulus and the strength. The mechanical properties are evaluated from the test data under idealising assumptions such as homogeneity of the material as well as a homogeneous stress distribution. In real off-axis tests, however, significant deviations from the idealising assumptions are present. The reduction of the accuracy of the results strongly depends on the off-axis angle. In this paper a series of off-axis tests is analysed. The stresses on potential failure plane are calculated by finite element analyses. By varying the geometrical parameters it is shown how small deviations from the ideal case influence the measured elastic constants and the strength. Especially at low off-axis angles the mechanical properties strongly vary with the angle. In addition, fracture surfaces for different shear/normal stress combinations are studied andOff-axis tests are widely used for the determination of the anisotropic mechanical properties of composite materials, this is, the longitudinal E-modulus and the strength. The mechanical properties are evaluated from the test data under idealising assumptions such as homogeneity of the material as well as a homogeneous stress distribution. In real off-axis tests, however, significant deviations from the idealising assumptions are present. The reduction of the accuracy of the results strongly depends on the off-axis angle. In this paper a series of off-axis tests is analysed. The stresses on potential failure plane are calculated by finite element analyses. By varying the geometrical parameters it is shown how small deviations from the ideal case influence the measured elastic constants and the strength. Especially at low off-axis angles the mechanical properties strongly vary with the angle. In addition, fracture surfaces for different shear/normal stress combinations are studied and typical phenomena are identified.zeige mehrzeige weniger

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Metadaten
Autor*innen:Christian Marotzke, Titus Feldmann
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):SEICO 14 - SAMPE Europe 35th International conference and forum (Proceedings)
Jahr der Erstveröffentlichung:2014
Herausgeber (Institution):SAMPE - Society for the advancement of material and process engineering
Ausgabe/Heft:Session 5B
Erste Seite:293
Letzte Seite:300
Freie Schlagwörter:Composites; E-modulus; Off-axis test; Strength
Veranstaltung:SEICO 14 - SAMPE Europe 35th International conference and forum
Veranstaltungsort:Paris, France
Beginndatum der Veranstaltung:10.03.2014
Enddatum der Veranstaltung:11.03.2014
ISBN:978-90-821727-0-6
Verfügbarkeit des Dokuments:Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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