Analysis for Blade with Centrifugal Preload under the Impact Stress Wave

Abstract:

Foreign object damage of engine blades often occurs when they are working with high rotating speed. Nonlinear finite element models for foreign object damage of blades with different centrifugal prestress were established. And the initializations of stress and displacement field for blade due to centrifugal preload were obtained by the dynamic relaxation method in the beginning of the dynamic analysis of impact. The effect mechanism of centrifugal stress on the foreign object damage of the blade was also investigated based on the impact theory of prestressed Timoshenko beam and the principle of stress wave propagation. The results indicate that the local plastic deformation on the impact location of the blade with centrifugal preload, which is produced at the moment of impact, is decreasing with the increase of preload. Attenuation speed of compressive stress wave, which is produced by the moment of impact on the blade face, is reducing with the augment of preload.

• Periodical: Advanced Materials Research (Volumes 490-495)
• Pages: 1986-1991
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.490-495.1986
• Online since: March 2012
• Authors: Dong Mei Yin, Zhen Xiao Li
• Keywords: Centrifugal Prestress, Dynamic Relaxation Method, Foreign Object Damage (FOD), Stress Wave

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