Some considerations on the constant stress disc profile

Abstract

The main characteristics and applications of constant stress discs in turbine and flywheel technologies are summarized. The problem of the disc-shaft connection and that of achieving a levelled stress distribution in pierced discs in thoroughly discussed. Many solutions to the latter problem are presented, noting that their practical interest is limited by the plane stress state assumption on which they are based. A new approach to the optimization of the disc is then proposed. It allows to obtain disc profiles which, although not leading to a completely levelled stress distribution, show very good characteristics both for the construction of turbine discs and flywheels. Some considerations on thermal stressing and on prestressing due to overspeeding are also included. © 1989 Pitagora Editrice Bologna.