Möglichkeiten und Grenzen zur Beschreibung der mechanischen Eigenschaften von Faserverbundwerkstoffen mit Hilfe der Kontinuumstheorie

Abstract

In diesem Artikel werden Moglichkeiten und Grenzen der Anwendung der Modelle der Kontinuumstheorie fur die Berechnung der mechanischen Eigenschaften einesverbundwerkstoffs am Beispiel des Einsatzes der Mischungsregel fur die Ermittlung der Zugfestigkeit des unidirektionalen Faserverbundwerkstoffs vorgestellt . Alle durchgefiihrten Betrachtungen betreffen unidirektionale Faserverbundwerkstoffe (Langfaser), die in Richtung der Faser auf Zug belastet werden. Continuum theory -its potential and limits for the properties description of fibre-reinforced compositesThe different models of continuum theory for the prediction of mechanical properties of composites are presented. The analysis is carried out for the continuous fibre-reinforced unidirectionally loaded composites and concerns basic mechanical properties. The aspects of metal andor ceramic-matrix composites are explained and their influence on the possible differences between the experimental results and theoretical calculation is analysed. The reasons of deviations concerned to the models and the experiments are also discussed. An algorithm to adopt the rule of mixture for the calculation of tensile strength of unidirectional loaded fiberreinforced composite is presented. The matrix-fibre interface properties as well as fibre and matrix behaviour are included in this algorithm.The correlation between the failure mode of composites and its properties is analysed as well.The stress-strain behaviour of the composites concerning failure modes and the phases properties is fully described. The different models which offer the better description of the composite properties than the rule of mixture are also presented and discussed. Einfuhrung