非比例多轴载荷耳片的疲劳分析方法  

A Fatigue Analysis Method for Lugs Under Non-proportional Multiaxial Loading

作　　者：张帅 陈海波 李宝珠 ZHANG Shuai;CHEN Hai-bo;LI Bao-zhu(Engineering Technology Center,AVIC XAC Commercial Aircraft Co.,Ltd.,Xi′an 710089,China)

机构地区：[1]中航西飞民用飞机有限责任公司工程技术中心,西安710089

出　　处：《西安航空学院学报》2022年第1期33-37,共5页Journal of Xi’an Aeronautical Institute

摘　　要：基于飞机耳片结构承受的实际载荷,提出了一种非比例多轴载荷谱的疲劳分析方法。首先对耳片疲劳危险点和疲劳抗力随载荷方向的变化进行分析,将所有载荷方向下潜在疲劳危险点离散为多个疲劳细节,建立多细节分析模型;然后按照疲劳细节点应力分布等效原则,将非比例多轴载荷谱处理为分别适用于每个细节的单向载荷谱;最后使用疲劳细节额定值法分析每个细节,并以其中疲劳最严重的细节作为耳片的分析结果。该方法定量描述了非比例多轴载荷对耳片疲劳性能的影响,易于程序化,适于工程应用。According to the actual load of aircraft lug structure,a non-proportional multiaxial load spectrum fatigue analysis method is proposed.Firstly,the fatigue risk points and fatigue resistance of the lug with load direction are analyzed.The potential fatigue risk points under all load directions are separated into multiple fatigue details,thus a multi-detail analysis model is established.Then,according to the principle of equivalent stress distribution at fatigue detail points,the non-proportional multiaxial load spectrum is treated as the unidirectional load spectrum applicable to each detail.Finally,the fatigue detail rating method is used to analyze each detail,and the most serious fatigue detail is taken as the analysis result of the lug.This method describes quantitatively the influence of non-proportional multiaxial load on the fatigue performance of the lug,which is easy to be programmed and suitable for engineering application.

关 键 词：耳片 多轴载荷 疲劳载荷谱 非比例载荷 损伤等效 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]