Damage Due to Stress Wave Propagation in Composite Fan Blades of Aircraft Engine Subjected to Bird Strike Loading

Publications

Damage Due to Stress Wave Propagation in Composite Fan Blades of Aircraft Engine Subjected to Bird Strike Loading

Year : 2024

Publisher : Springer Science and Business Media B.V.

Source Title : Mechanisms and Machine Science

Document Type :

Abstract

It has been observed that when the rotating composite fan blade in an aircraft engine is subjected to high-velocity bird strike, the damage is generally seen on/near the trailing edge even though the impact is happening on the leading edge. This behavior of the blade is tentatively attributed to the stress wave propagation, but there is a strong need for deep understanding to be developed on this. This report talks about the efforts to understand the reasons for trailing edge strain hot spots happening due to bird strike impact on the leading edge. In this context, fundamental plate-level bird impact and simple wavelet excitation studies were performed along with the stress wave propagation studies. The studies show that the stress wave propagation could be attributed up to some extent to the high strain spots appearing on/near the trailing edge. The studies also showed that these strain hot spots can be avoided by applying some innovative techniques.