Fabrication and spin test of thick, laminated S2-glass flywheel discs

Technical Report · Thu Apr 16 04:00:00 EST 1981

OSTI ID:6779483

Nimmer, R P; Torossian, K A; Hickey, J S

The results of a program to fabricate and test model flywheels made of thick laminated S2-glass are presented under 5 headings, i.e., fabrication of thick, laminated discs; failure criterion for these laminated discs; spin tests on laminated discs; manufacture and characterization of the filament wound outer rings; and assembly and spin testing of complete hybrid disc-ring flywheels. It was demonstrated that laminated discs up 3.6 cm (1.4 in.) thick can be manufactured with fiber volume content between 48 to 50% and void content less than 1.8% for application to flywheel energy storage. Analysis indicated that initial damage to the matrix of such discs will occur at the center of the disc at comparatively low tip speeds. This was observed, but the initiation of damage did not seem to be closely related to ultimate failure. Hybrid disc-ring flywheels composed of S2-glass/epoxy, laminated discs and filament wound, graphite/epoxy rings assembled with an interference fit were successfully fabricated. Initial spin tests substantiated analytical predictions of initial damage due to delamination of the outer ring. Final failure was due to increased system vibration in both tests. Improvements in ultimate energy densities of 44% have been demonstrated with respect to thick laminated discs without outer rings. Reduction of the inside-to-outside radius ratio of the graphite ring should allow ultimate energy densities of 55 Wh/kg (25 Wh/lb.) and greater to be reached without delamination of the ring. This ultimate energy density is higher than reported energy densities for high performance metal flywheels.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6779483
• Report Number(s): UCRL-15308
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250500* -- Energy Storage-- Flywheels
CARBON
COMPOSITE MATERIALS
DATA
ELEMENTS
EPOXIDES
EXPERIMENTAL DATA
FABRICATION
FAILURES
FIBERGLASS
FLYWHEELS
GRAPHITE
INFORMATION
MATERIALS
MECHANICAL ENERGY STORAGE EQUIPMENT
MECHANICAL PROPERTIES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PERFORMANCE
PERFORMANCE TESTING
STRESS ANALYSIS
TENSILE PROPERTIES
TESTING