Optimal Design of Hybrid Composite Flywheel Rotor, Phase I
Abstract
An optimal design procedure for composite flywheel rotors was developed. The composite materials were inherently anisotropic: the mechanical and thermal properties differed with direction, causing large residual stresses to develop during the manufacturing process. Such residual stresses add to mechanical stresses developed during rotation. A model was proposed, which quantitatively characterized the process-induced residual stresses. Cylinders of three sizes were manufactured and the residual strains in the radial and hoop directions were measured. The measured residual stains were then compared with those from the model. The effects of the residual stresses on a hybrid rotor were then analyzed by comparing the two-dimensional solution to the three- dimensional finite-element program. The residual stresses in the rotor with the angle variation along the radial direction were also analyzed. Finally, the stress-analysis module was linked to a program in which the design variables can be optimized for the various sizes and material sequences of the composite flywheel rotor with a consideration of both the residual stresses and the rotational centrifugal stresses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2002
- Accession Number
- ADA398400
Entities
People
- Dong-jin Kim
- Sung Kyu Ha
- Young-bok Yoon
Organizations
- Hanyang University