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Journal ArticleDOI

Foreign Object Damage to Fan Rotor Blades of Aeroengine Part I: Experimental Study of Bird Impact

01 Oct 2007-Chinese Journal of Aeronautics (Elsevier)-Vol. 20, Iss: 5, pp 408-414
TL;DR: In this paper, the anti-foreign object damage design for the fan rotor blades of an aeroengine is provided. And the conditions of experiment for bird impact to blades have been improved.
About: This article is published in Chinese Journal of Aeronautics.The article was published on 2007-10-01 and is currently open access. It has received 22 citations till now. The article focuses on the topics: Rotor (electric).
Citations
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Journal ArticleDOI
TL;DR: In this paper, a three-blade computational model is set up for the fan rotor blade having shrouds, and the transient response curves of the points corresponding to measured points in experiments, displacements and equivalent stresses on the blades are obtained during the simulation.

30 citations


Cites methods or result from "Foreign Object Damage to Fan Rotor ..."

  • ...The impacting velocities, directions, incident angles and impacting positions are consistent with the measured values of experiments[19]....

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  • ...cn the fan rotor blades of the aeroengine[19], the numerical analysis for the transient response of blades impacted by bird is performed using the contacting-impacting algorithm under the experimental conditions of bird impact (such as the dimension, mass and the impacting velocity, angle and position of the analogue bird)....

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Journal ArticleDOI
TL;DR: In this article, the effects of impact velocity, impact location, and braiding angle on the bird impact behavior were studied, and it was concluded that the damage and failure become more severe with the increasing impact velocity.
Abstract: The three-dimensional braided composites, with intertwined fiber bundles in the through-thickness direction, have advantages of high interlaminar shear strength, fracture toughness, and excellent impact resistance, making them a promising material for applications in the field of aeroengine fan blades. As the bird impact behavior of the fan blade directly affects the safety of the aeroengines, it is of great significance to study the dynamic response and damage mechanism of 3D braided composites under bird strike load. In this paper, the bird impact tests on the 3D four-step braided composite targets were carried out using the gas gun system. The effects of impact velocity, impact location, and braiding angle on the bird impact behavior were studied. It is concluded that the damage and failure become more severe with the increasing impact velocity. The whole impact event could be divided into 3 stages, i.e., local deformation stage, postflow impact stage, and bending deflection stage. The braided composite presents flexible characteristics and could bear extraordinary deformation during the bird impact. One distinguishing feature of bird impact damage is the destruction of the clamping root due to bending load caused by cantilever construction. The internal damage form at the impact area was mainly the separation of the fiber bundles from the matrix while the breakage of the fiber bundles and the crushing of the matrix play the primary role at the root part. The target plate impacted at the 70% height had the largest bending angle and most serious damage, followed by those impacted at the 90% and 50% heights. Both the appearance damage and internal damage extent are smallest for 45° braiding composites.

17 citations

Proceedings ArticleDOI
04 Jan 2011
Abstract: Jet engines are the most susceptible aircraft structures to catastrophic damage caused by soft impact events, such as ingesting birds or hail stones. Future propulsion systems will incorporate advanced composites, particularly in the fan assembly, because of their superior strength and stiffness properties compared to metals. However, reliance on physical testing to assess the crashworthiness of engine designs currently inhibits the development of novel propulsion concepts. The findings presented in this work are part of a study aimed at developing an extensive analytical methodology for predicting and assessing damage to engine forward sections containing composite structures. In this study, a modeling approach for capturing damage due to bird strike on composite fan blades and a fan assembly was developed. Impacts on a pre-stressed composite static single blade and a full rotating fan assembly were simulated. Two numerical methods were used to model the bird using an explicit finite element (FE) code: (1) an arbitrary Lagrangian-Eulerian (ALE) method, and (2) a meshless Lagrangian particle method. First, these models were calibrated, generating interface impact pressure results that correlated well with experimental data and previous extensive FE results. Next, bird strike simulations on a single blade were carried out, with each approach capable of producing damage and failure within the composite structure. Finally, an impact scenario on a full fan stage rotating at 7200 rpm was conducted. Both bird models successfully captured the impact and spread of the fluidic bird material, predicting a similar extent of damage to the composite fan assembly. It was concluded that the focus of future damage analysis needs to be on accurately capturing the steady stagnation pressure phase of impact as the short-duration Hugoniot pressure phase is negligible. Another conclusion of this analysis was that damaged blades often impacted neighboring blades following the initial bird strike, producing more catastrophic damage as high stresses at the roots caused full blade detachment. The bird impact composite damage modeling approach developed is a critical first step towards the development of an extensive methodology for evaluating the crashworthiness of future propulsion systems subject to soft impact damage.

15 citations

Journal ArticleDOI
TL;DR: T700/TDE-85 composites were aged in cyclic hygrothermal tests in accordance with the service environment of military aircraft, and the variations in interlaminar shear strength (ILSS) and ballistic...
Abstract: T700/TDE-85 composites were aged in cyclic hygrothermal tests in accordance with the service environment of military aircraft, and the variations in interlaminar shear strength (ILSS) and ballistic...

14 citations


Cites background from "Foreign Object Damage to Fan Rotor ..."

  • ...Composite structures in aircraft applications may be subjected to unexpected impact load in service, such as bird impact, blade out event and uncontained fragment impact [1,2]....

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Journal ArticleDOI
TL;DR: In this paper, a finite element model of a bird impacted on a plate is developed with the explicit code PAM-CRASH to examine the process of a rotary engine primary compressor impacted by a bird.

12 citations

References
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Journal Article
TL;DR: In this article, a sliced model for a bird simulated by ellipsoid impacting blades is presented, and the dimensions and the masses of the largest slice for the birds of three different masses are computed and compared with those of cylinder-simulated birds.
Abstract: Accidents of bird impact are a type of accidents happend in aviation. The serious failures of the engine such as damage or shut down may be brought on, when the birds impact the first stage fan or compressor blades. To analyze the response of the first stage fan or compressor blades impacted by birds, a sliced model for bird impacting blades must be firstly determined. A sliced model for a bird simulated by ellipsoid impacting blades is presented. The formula for calculating dimensions and masses of the largest slice are given. The dimensions and the masses of the largest slice for ellipsoidal simulated birds of three different masses are computed and compared with those of cylinder-simulated birds.

10 citations