文献类型：期刊文献

中文题名：基于等效寿命的航空铆接疲劳特性试验研究

英文题名：Fatigue characteristics of aeronautic riveted lap joint based on equivalent life

作者：曾超 田威 罗少敏 刘向尧

第一作者：曾超

机构：[1]贵州理工学院航空航天工程学院,贵州贵阳550003;[2]南京航空航天大学机电学院,江苏南京210016

第一机构：贵州理工学院航空航天工程学院

年份：2020

卷号：0

期号：2

起止页码：81-86

中文期刊名：兵器材料科学与工程

外文期刊名：Ordnance Material Science and Engineering

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：国家自然科学基金(51575273);贵州省自然科学基金(20161065);贵州理工学院军民融合科技专项(KJZX17-011).

语种：中文

中文关键词：干涉铆接;疲劳特性;裂纹闭合;等效寿命;航空

外文关键词：interference riveting;fatigue property;crack closure;equivalent life;aeronautics

摘要：通过二级变幅载荷谱试验与Elber模型相结合分析搭接铆接结构疲劳特性,讨论铆接参数对疲劳断口特征及疲劳寿命的影响。结果表明:疲劳裂纹萌生于搭接板内的多个位置,裂纹源及断裂截面位置受铆接参数及疲劳载荷水平影响;对于较大铆接力下疲劳载荷影响更显著,使用基于Elber裂纹张开应力模型的等效裂纹扩展速率能较好反映铆接工艺及第二弯曲效应影响下的结构疲劳寿命;通常情况下增大铆接力有利于提高疲劳寿命,但其变化规律依赖于疲劳载荷的水平;Smax=100 MPa时,增大铆接力对于4 mm铆钉试件提高疲劳寿命效果显著,但Smax=150 MPa时,较高的铆接力会导致疲劳寿命的增益出现衰减。
The fatigue property of riveted lap joint was analyzed by conducting the fatigue test using a variable amplitude load spectrum of two levels in association with the Elber model.The influences of the riveting process parameters on the fracture characteristics and fatigue life were discussed.The result shows that fatigue cracks initiate from several locations in the sheet.The crack sources and the fracture section locations are influenced by riveting parameters and load levels.The fatigue load has a more conspicuous influence when the riveting squeeze force is high.It can be concluded that the fatigue crack growth rate based on the Elber model of crack opening stress can give a better elucidation to the fatigue life influenced by the riveting process and the secondary bending.Fatigue life is generally extended with the increase of riveting squeeze forces,whereas the influence is dependent on the tested fatigue load level.When Smax=100 MPa,the fatigue life for 4 mm-rivet specimen is remarkably increased with the increase of squeeze forces.Nevertheless,when Smax=150 MPa,a higher squeeze force may result in a decrease of fatigue life.