预紧力对复合材料单搭接接头疲劳性能的影响  

Effect of Preload on Fatigue Properties of Composite Single-lap Joints

作　　者：肖睿恒 王耀 刘庆波 安鲁陵[2] XIAO Ruiheng;WANG Yao;LIU Qingbo;AN Luling(COMAC Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324,China;Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中国商飞上海飞机制造有限公司,上海201324 [2]南京航空航天大学,江苏南京210016

出　　处：《机械制造与自动化》2022年第5期65-69,共5页Machine Building & Automation

摘　　要：为研究螺栓预紧力对复合材料单搭接接头疲劳性能的影响,依据ASTM标准设计试样,进行疲劳试验与仿真分析;采用引伸计测量复合材料板孔径伸长量,研究不同预紧力对接头失效形式、疲劳寿命和孔径伸长量等的影响;建立有限元模型,分析疲劳载荷下孔周的渐进损伤。结果表明:预紧力大小不改变接头失效形式;随着预紧力增大,接头疲劳寿命逐渐增大;复合材料板孔径伸长量随循环次数的变化曲线可以分为疲劳初始阶段、孔径缓慢增长阶段和孔径加速增长阶段;仿真结果与试验吻合良好,可以分析出孔周损伤情况;增大预紧力,可以缩短疲劳初始阶段的循环次数,增大孔径缓慢增长阶段的循环次数。To study the effect of bolt preload on the fatigue properties of composite single-lap joints, test pieces were designed according to ASTM standard, and fatigue experiments and simulation analysis were conducted. Extensometer was applied to measure elongation of the composite laminate hole diameter in the experiments, and the effect of different preload on the failure form of the joint, fatigue life and elongation of the composite laminate hole diameter was studied. On this basis, a finite element model was established to analyze the progressive damage around the hole under fatigue load. The results show that the preload does not change the failure form of the joint. As the preload increases, the fatigue life of the composite single-lap joint gradually increases. The change curve of the elongation of the composite laminate hole diameter along with the number of cycles can be divided into three stages of initial fatigue, slow growth and accelerated growth. Since the simulation results are in good agreement with the experiments, the damage around the hole can be analyzed. Increasing the preload can shorten the number of cycles in the initial fatigue stage and increase the number of cycles in the slow growth stage of hole diameter.

关 键 词：复合材料 预紧力 疲劳性能 有限元分析 单搭接接头 

分 类 号：TB302.3[一般工业技术—材料科学与工程]