Accession Number : ADA119974

Title :   Response Sensitivity of Typical Aircraft Jet Engine Fan Blade-Like Structures to Bird Impacts.

Descriptive Note : Final rept. 1 Oct 77-30 Jan 79,


Personal Author(s) : Bauer,David P ; Bertke,Robert S

PDF Url : ADA119974

Report Date : May 1982

Pagination or Media Count : 49

Abstract : The response sensitivity of jet engine fan blade-like structures to the details of impact loading were studied. In particular, impacts of birds and ice on jet engines are difficult to model analytically. This report provides guidance in determining the spatical and temporal loading parameters that must be most accurately modeled in a coupled load-response analysis. A finite element model of a cantilever plate was subjected to various spatial and temporal loading details to determine important parameters. The cantilever plate was 7.62 cm (3-inches) by 24.46 cm (9.63-inches) by 3.81 mm (0.15-inches) thick. Applied loads simulated the impact load levels similar to a 85 g (3 ounce) bird impacting at 244 m/sec (800 ft/sec). The plate response was monitored by observing deflected shapes at several increments of time during and after impact. The results show that the cantilever plate and presumably a jet engine fan blade are very sensitive to the level of momentum transfer. The detailed spatial and temporal loads that most affect momentum transfer were found to be of particular importance to the structure response. (Author)

Descriptors :   *Fan blades, *Turbofan engines, *Ingestion(Engines), *Loads(Forces), *Impact, *Structural response, Computerized simulation, Momentum transfer, Finite element analysis, Birds, Ice formation, Shredding, Damage assessment, Pressure distribution

Subject Categories : Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE