摘要
薄壁金属粘接结构是国防工业中常见的结构类型,其界面粘接质量无损评价一直是国内外研究的热点和重点。本文基于数字剪切散斑干涉技术,利用四步相移法构建了剪切散斑干涉测量系统,详细分析了铝蒙皮粘接铝合金平板试件上不同粘接质量区域在负压载荷下的剪切散斑干涉条纹和离面位移场。实验结果发现粘接质量高低可通过剪切散斑干涉条纹图疏密程度表征。干涉条纹随着粘接质量增强逐渐稀疏,在局部弱粘情况下会出现类似脱粘状态的条纹分布。此外,本文利用Cohesive单元模拟胶粘层,计算分析了铝蒙皮粘接试件有限元模型在负压加载下离面位移场。数值结果与光测实验结果相吻合,验证了利用剪切散斑干涉技术评价薄壁金属界面粘接质量的可行性。
Thin-walled metal bonding structure has been widely used in national defense industry,and the nondestructive evaluation of its interfacial bonding quality has been a hot topic and focus of research at home and abroad.In this paper,based on digital shear speckle interferometry,an optical nondestructive measurement system is established by using four-step phase shift method to analyze in detail the shear scatter interference fringes and out-of-plane displacement fields in different bonding quality regions on aluminum alloy flat specimens bonded with aluminum skins under negative pressure loads.The experimental results indicated that the quality of the bonding quality can be characterized by the density of the shear speckle interference fringe pattern.The interference fringes become sparse gradually with the increase of bonding quality and a stripe distribution similar to a debonding state can occur in the case of local weak adhesion.In addition,the out-of-plane displacement field of a finite element model of an aluminium skin bonding specimen under negative pressure load is calculated and analyzed with the simulation of adhesive layers using Cohesive units.The numerical results are in agreement with the photometric experimental results,and the feasibility of evaluating the bonding quality thin-walled metal interfaces is verified.
作者
张贵辉
占明明
简琦薇
刘斌
王硕
ZHANG Gui-hui;ZHAN Ming-ming;JIAN Qi-wei;LIU Bin;WANG Shuo(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Hubei Institute of Aerospace Chemical Technology,Xiangyang 441003,China)
出处
《激光与红外》
CAS
CSCD
北大核心
2022年第11期1615-1621,共7页
Laser & Infrared
关键词
剪切散斑
粘接质量
薄壁金属粘接
无损评价
shearography
bonding quality
thin-walled metal adhesive structure
nondestructive evaluation
