Analysis of protective ability of turbojet fan case
The problem on holding the torn vane of turbojet fan to ensure passengers and crew’s safety is studied. The construction arrangement is described. It is performed strength analysis and calculations on impact energy absorption of torn vane by special goffer protective cover made of high-strength cloth. The protective cover can be installed on any fan case both of metal and composite materials without principal changes in structural configuration. The procedures for calculation of wall breaking by torn vane are considered. The difference between procedure’s calculation results and experimental data for ductile metals are demonstrated. The procedure on calculation of metal case with allowance for the ultimate strain, as well as procedure on calculation of combined metal case containing protective cover made of high-strength cloth are offered. The application of plastic composite to avoid puncture of load-carrying case by torn vane of fan is describe.