SMA损伤对航空发动机变形齿单齿力学性能的影响

doi:10.11896/cldb.20060196

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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.

Key words： shape memory alloy variable geometry chevron damage

Published: Online: 2021-09-07

CLC number:	V22
	TB34

Fund:National Natural Science Foundation of China (11502284),Key Deployment Projects of Chinese Academy of Sciences(KFZD-SW-435),the Fundamental Research Funds for the Central Universities of China (3122020077), the Project of Experimental Innovation Fund for Civil Aviation University of China (2019CXJJ08).

About author: Bingfei Liu,associate professor of Civil Aviation University of China, master tutor, doctor of solid mecha-nics of Beijing Jiaotong University, won the first prize in the 7th National College of Basic Mechanics Young Teachers Lecture Competition. He presided over and participated in many projects such as the National Natural Science Foundation Youth Project, General Project, Tianjin Natural Science Foundation, Central University Basic Research Service Fee, etc. He published more than 20 papers in domestic and foreign academic journals as the first author, applying for the country 4 invention patents. The main research directions are new material design and fatigue damage behavior analysis of aero engine tail nozzles.
Chunzhi Du,associate professor of Civil Aviation University of China, master tutor, doctor of solid mechanics of China University of Mining and Technology, teacher of the Department of Aircraft, School of Aeronautical Engineering, and excellent instructor of Zhou Peiyuan mechanics competition, won the 2019 National Xu Zhilun Mechanics Excellent Teacher Award. He is mainly engaged in research work such as aircraft structural da-mage and fatigue simulation analysis. He has presided over and participated in many projects such as the National Natural Science Foundation Youth Project, General Project, Civil Aviation Joint Fund, Tianjin Natural Science Foundation, and Central University Basic Research Ser-vice Fees. Published more than 10 scientific research papers and applied for 6 patents.

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	LIU Bingfei
	DONG Shaozhe
	ZHOU Rui
	DU Chunzhi

Cite this article:

LIU Bingfei,DONG Shaozhe,ZHOU Rui, et al. Effects of SMA Damage on Mechanical Property of Variable Geometry Single Chevron of Aero Engine[J]. Materials Reports, 2021, 35(16): 16070-16075.

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http://www.mater-rep.com/EN/10.11896/cldb.20060196 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16070

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