Zum Einfluss der Bauteilgroesse auf die Zuverlaessigkeit von Bauteilen aus Faser-Kunststoff-Verbund

Fibre reinforced plastics (FRP) are mostly used for highly optimized structures. Due to the brittle fracture behaviour of FRP these structures show almost no redundancy, and a strong size effect can be observed in experiment. In this report a method will be presented that allows to calculate the probability of failure for structures showing series system behaviour. The method takes componential size and stress-distribution in the entire component into account. The stress-distribution is determined using a finite element code with an anisotropic shell element based on Classical Laminate Theory. A physically based multi-modal fracture criterion for unidirectional FRP is coupled with FORM methods and a series system model to calculate the probability of first ply failure in the entire component. Correlations among the various failure modes are taken into account. The fracture criterion and the determination of its parameters from experiment are discussed. Finally a realistic tube structure is analysed to demonstrate the effects of size and stress-distribution on reliability and partial safety factors. (orig.)Available from TIB Hannover: RR 275(1995,7) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman