CFRP壁板螺栓填隙补偿连接过程变形及局部应力分析  

Analysis of Deformation and Localized Stress During Gap Compensation Joining Process of CFRP Panel Bolting

作　　者：孟庆勋 徐贺 张辉[2] 刘超[1] 刘天培 MENG Qingxun;XU He;ZHANG Hui;LIU Chao;LIU Tianpei(Shenyang Aerospace University,Shenyang 110136,China;AVIC Shenyang Aircraft Industry(Group)Co.,Ltd.,Shenyang 110034,China)

机构地区：[1]沈阳航空航天大学,沈阳110136 [2]航空工业沈阳飞机工业(集团)有限公司,沈阳110034

出　　处：《航空制造技术》2024年第16期130-137,共8页Aeronautical Manufacturing Technology

基　　金：国防基础科研项目(JCKY2023205B005);辽宁省科技厅项目(LJKZ0213)。

摘　　要：碳纤维复合材料(CFRP)广泛应用于飞机壁板结构,受成型工艺限制,构件贴合面处会出现不同程度的装配间隙,在实际工程中间隙超过一定阈值时需要进行填隙补偿处理,加垫后壁板装配变形及应力集中情况复杂,影响后续飞机服役性能。对此,进行填隙补偿后螺栓紧固顺序对CFRP壁板装配质量影响仿真分析和试验验证。经分析可知,壁板偏移为以右上端点为圆心向左下方的旋转变形。法向变形出现在壁板左右两侧和螺栓孔周围,改变螺栓紧固顺序法向变形值最大值减小约63.4%。紧固顺序对壁板整体应力分布情况影响较小,对螺栓孔周应力分布和壁板装配变形分布影响较大,对称性连接比按顺序连接更有优势。孔周应力分布与间隙跨度和间隙量密切相关,随着间隙量的提高,应力值和传递的范围逐渐增大。Carbon fiber reinforced polymer(CFRP)is widely used in aircraft panel structures.Due to molding process constraints,there are varying degrees of assembly gaps at component interfaces.In engineering practice,when the gap exceeds a certain threshold,gap-compensation measures are required.The panel assembly experiences complex deformation and stress concentration after gap compensation,affecting subsequent aircraft operational performance.Therefore,simulation analysis and experimental verification on the impact of bolt fastening sequences on CFRP panel assembly quality after gap filling are conducted.Analysis reveals that the panel offsets with a rotational deformation centered at the upper right endpoint towards the lower left.Normal deformations occur on both sides of the panel and around the bolt holes,with the maximum normal deformation value decreasing by approximately 63.4%when changing the bolt fastening sequence.The fastening sequence has a minor infuence on the overall stress distribution of the panel,while signifcantly affects the stress distribution around the bolt holes and the distribution of panel assembly deformations,favoring symmetric joining over sequential joining.The stress distribution around the holes is closely related to the gap span and amount,increasing in magnitude and range as the gap amount rises.

关 键 词：填隙补偿 CFRP壁板 紧固顺序 装配变形 应力分布 

分 类 号：V262[航空宇航科学与技术—航空宇航制造工程]