振动应力和稳态应力联合作用的疲劳试验夹具设计  

Fatigue test fixture design for the combination of vibration stress and steady state stress

作　　者：李冬春 程礼[1] 刘景元 王博涵 吴宇航 丁均梁 LI Dongchun;CHENG Li;LIU Jingyuan;WANG Bohan;WU Yuhang;DING Junliang(College of Aeronautical Engineering,Air Force Engineering University,Xi’an 710038,Shaanxi,China;Air Combat Service College,Aviation University Air Force,Changchun 130022,Jilin,China)

机构地区：[1]空军工程大学航空工程学院,陕西西安710038 [2]空军航空大学航空作战勤务学院,吉林长春130022

出　　处：《实验力学》2021年第6期783-792,共10页Journal of Experimental Mechanics

基　　金：陕西省基金:进气总压畸变条件下失谐压气机叶片气弹稳定性研究(2020JQ-477)。

摘　　要：基于航空发动机叶片基本失效模式,开发了一种可施加振动应力和稳态应力联合作用的高频(激振频率1195Hz左右)疲劳试验夹具。本文对该试验夹具的设计工作进行了详细的介绍和分析,首先建立二自由度动力学系统模型,随后采用Solidworks三维建模软件对各部件进行辅助建模,并借助Abaqus对振动组件进行模态和应力场分布分析。利用该试验夹具对TC4钛合金进行了振动应力和稳态应力联合作用的疲劳试验,验证了该夹具的可行性。对疲劳断口进行了显微观察和分析,结果显示:裂纹源区、裂纹扩展区和瞬断区三个重点区域的典型特征清晰可见,裂纹萌生机制为表面滑移。Based on the basic failure condition of aero-engine blade,a high-frequency(1195Hz)fatigue test fixture was developed,which can apply the combined action of vibration stress and steady-state stress.The design work of the test fixture is introduced and analyzed in detail.Firstly,SolidWorks 3D modeling software is used to assist the modeling of each component,and then ABAQUS is used to carry out the modal analysis of the vibration component.The fatigue test of TC4 titanium alloy under the combined action of vibration stress and steady-state stress was carried out by using the test fixture,and the feasibility of the test system was verified.The results show that the typical characteristics of three key areas,namely crack source area,crack propagation area and transient fracture area,are clearly visible,and the crack initiation mechanism is surface slip.

关 键 词：振动应力 稳态应力 高频 疲劳试验 振动台 

分 类 号：V215.55[航空宇航科学与技术—航空宇航推进理论与工程]