基于有限元分析和断裂准则的FOD易折杆设计  

Design of FOD Easy Fracturing Rod Based on Finite Element Analysis and Fracture Criterion

作　　者：罗俊睿 李虎山 丁子恒 王国平[1] 方坤[2] 宋奎晶[1] LUO Junrui;LI Hushan;DING Ziheng;WANG Guoping;FANG Kun;SONG Kuijing(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;The 38th Research Institute of CETC,Hefei 230088,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]中国电子科技集团公司第三十八研究所,安徽合肥230088

出　　处：《电子机械工程》2022年第5期51-55,共5页Electro-Mechanical Engineering

基　　金：2021年大学生创新训练项目(S202110359032,X202110359059);国家自然科学基金资助项目(51905143)。

摘　　要：机场跑道异物(Foreign Object Debris,FOD)探测系统易折杆设计是保证探测系统有效工作的关键,对防范FOD引起的机场安全风险具有至关重要的作用。文中以FOD探测系统支架易折杆为研究对象,提出在圆管上开半圆形缺口的设计方案以实现易折杆易断和耐疲劳的综合力学性能。通过有限元模拟方法,分析了不同圆角半径、圆管壁厚和缺口形状的易折杆在不同工作载荷下的应力应变状态。结果表明,随着缺口半径增大或壁厚减小,缺口根部应力水平提高,能够使易折杆在受到飞机撞击时快速断开,具备易折特性,但会降低疲劳寿命;反之会增加疲劳寿命,但不容易实现易折特性。合理调节壁厚和圆角半径,可以使易折杆具有易断性和耐疲劳的综合力学性能。The structural design of the easy fracturing rod for the detection system of foreign object debris(FOD)of airport runway is the key to ensure the effective work of the detection system and plays a crucial role in preventing airport security risks caused by FOD.In this paper,the easy fracturing rod of FOD detection system is taken as the research object.The design of semicircular notch in circular tube is proposed to realize the comprehensive mechanical properties of the easy fracturing rod,including easy fracturing and enough fatigue resistance.The stress and strain states of easy fracturing rod with different fillet radius,pipe wall thickness and notch shape under different working loads are analyzed by finite element simulation.The results show that as the fillet radius increases and the wall thickness decreases,the stress level at the notch root increases,which can make the easy fracturing rod break rapidly when it is hit by FOD,so the rod has the characteristics of easy fracturing,but it will reduce the fatigue life.On the contrary,the fatigue life will be improved while it is not easy to meet the easy fracturing characteristics.Reasonable adjustment of wall thickness and fillet radius can make the easy fracturing rod have the comprehensive mechanical properties of easy fracturing and enough fatigue resistance.

关 键 词：易折杆 易断性 疲劳失效 圆形缺口 有限元 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]