Composite flywheels with rim and hub

Optimization of flywheel rotor made of three-dimensional composites

“…This compressive stress was expected to suppress the delamination. This improvement by the MR has been successful in rotating disks having k of 0.5-0.8 [10][11][12]. However, disks of this type tend to cause fracture in the metal hub because of its low specific strength compared to those of CFRPs.…”

“…For UDCFs, when k is higher than 0.8, the premature fracture of its Al hub is predicted. The BTSs referred from existing studies of multi-rings (MRs) [1,10,11] are also shown in Fig. 4.…”

“…5, energy densities quoted from past studies [1,10,11,13,14] are shown with reference numbers. Quotations from MRs are of the combination with its Al alloy hub.…”

“…Although this result suggests the potential of 3DCF for use as a high-performance rotor, its reinforcement pattern is not optimized. Ikegami et al pointed out the importance of radial reinforcement [10], but disks with smaller k remain to be discussed.…”

“…To prevent UDCF disk delamination, the multi-ring method (MR) has been adopted [10][11][12]. In this method, multiple thin annular rings made of UDCF were assembled by press-fitting.…”