Abstract: The aero engine variable geometry chevron (VGC) is a saw-tooth aerodynamics device driven by shape memory alloy (SMA) beams, which is fixed in the tail of the engine bypass and distributed in a ring. It can disturb the airflow in the engine bypass through bending deformation during take-off and landing to reduce the noise.However, in the process of repeated use, the cyclic bending deformation of VGC will inevitably lead to material damage, and even functional or structural fatigue, which will cause unpredictable effects on aero engine performance.In view of this, this work intends to carry out the research on the influence of SMA damage on the mechanical behaviors of aero engine VGC.Based on the existing SMA constitutive model, the damage factor was introduced to establish the SMA constitutive model with damage, the finite element subroutine was written, and the effect of SMA damage on the mechanical behaviors of VGC was simulated and analyzed.The results show that as the degree of SMA damage increases, the tip deflection of VGC increases and the maximum Mises stress decreases. Guidance for the safety operations of VGC can be provided from the research results.
刘兵飞, 董少哲, 周蕊, 杜春志. SMA损伤对航空发动机变形齿单齿力学性能的影响[J]. 材料导报, 2021, 35(16): 16070-16075.
LIU Bingfei, DONG Shaozhe, ZHOU Rui, DU Chunzhi. Effects of SMA Damage on Mechanical Property of Variable Geometry Single Chevron of Aero Engine. Materials Reports, 2021, 35(16): 16070-16075.
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2021, Vol. 35 
