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Principal different rotor failure modes require adapted design approaches for the design of composite containments. The Hagg/Shankey approach considers the brittle fracture of isotropic rotors and the subsequent impact of large fragments in containment rings. Other approaches are based on multi-fragmentation, which is typical for rotors made of composite materials. This failure mode assumes a composite dust rather than large fragments. The physical model is more complex and only first semi-empirical ideas have been formulated to describe the post-failure effects on the containment.
The composite dust has the potential to cause a carbon dust explosion but rather often also results in a composite particle flow. This latter effect has already been observed in practical applications. Due to recent advances in experimental composite rotor failure assessment, this manifold burst behavior with axial shock waves not known for metallic rotors, could be proved principally.
Two different theories to analyze these “dust” failure effects are theoretically analyzed concerning their physical plausibility. A comparison with experimental data is presented and the general assessment of these semi-empirical approaches is used to estimate containment loading limits.
CFRP, composite rotor, containment, failure effects, flywheel, spin testing
TU Dresden, Institut für Leichtbau und Kunststofftechnik, Dresden,
EAST-4D GmbH Lightweight Structures, Chemnitz,