铺层方式对CFRP-铝合金单搭接胶接接头低速冲击损伤及剩余拉伸性能的影响  

Effect of Stacking Sequence on Low Velocity Impact Damage and ResidualTensile Properties of CFRP-Aluminum Single-lap Adhesive Joints

作　　者：邹田春 符记 巨乐章 李晔 ZOU Tianchun;FU Ji;JU Yuezhang;LI Ye(School of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学安全科学与工程学院,天津300300

出　　处：《材料导报》2023年第11期159-165,共7页Materials Reports

基　　金：国家自然科学基金(52071069)。

摘　　要：采用热压罐成型方法制备铺层方式为[+45/-45]_(4s)、[0/+45/-45/90]2s和[0/90]_(4s)的碳纤维复合材料层合板,通过胶黏剂与铝合金板进行粘接获得异质材料单搭接胶接接头。利用落锤冲击试验机和万能电子试验机分别对三种接头进行低速冲击与冲击后静态拉伸测试,获得接头接触力-时间曲线和拉伸强度。通过CT扫描技术和数字图像相关(DIC)方法表征接头冲击损伤模式及表面应变演化过程,研究了铺层方式对接头抗冲击性能、冲击损伤模式以及剩余拉伸性能的影响。结果表明,复合材料铺层方式为[+45/-45]_(4s)时,接头在冲击载荷作用下具有较高的抗冲击性能,但胶层界面脱粘损伤较为严重。与胶层界面脱粘相比,接头剩余强度对层合板分层损伤更为敏感。相较于[+45/-45]_(4s),[0/+45/-45/90]2s和[0/90]_(4s)铺层方式接头的胶层界面脱粘范围与冲击后失效载荷退化程度较小,同时接头冲击后拉伸载荷主要集中于临近胶层的0°铺层且失效模式较为复杂。此外,在冲击载荷作用下,层合板中的±45°铺层变形程度较小具有较强的抗剪切能力,能够有效减轻层合板的冲击损伤,提高接头的抗冲击性能;0°铺层变形程度较大且具有较高的抗拉强度,能够一定程度上减轻胶层与铝合金表面脱粘损伤并提高接头拉伸强度。The method of forming for autoclave was used to prepare carbon fiber reinforced plastics(CFRP)laminates with[+45/-45]_(4s),[0/+45/-45/90]2s and[0/90]_(4s)stacking sequences,and the single-lap adhesive joints with heterogene-ous materials were obtained by bonding the laminates and aluminum alloy plates using adhesive.The contact force-time curves and tensile strength of three kinds of joints under low-velocity impact testing and tension after impact(TAI)testing were obtained by drop hammer impact testing machine and universal electronic testing machine,respectively.The impact damage mode and joint surface strain field were characterized by X-ray computed tomography(X-ray CT)technique and digital image correlation(DIC)method,respectively.The effects of stacking sequence on the impact resistance,impact damage mode and joint residual tensile properties were studied.The results show that the joint with the composite adherend whose stacking sequence is[+45/-45]_(4s)has high impact resistance under impact load,but the interface debonding damage of adhesive layer is more serious.The joint residual strength is more sensitive to delamination damage than the adhesive layer interface debonding.Compared with[+45/-45]_(4s),the joints with the laminate as adherends whose stacking sequences are[0/+45/-45/90]2s and[0/90]_(4s),whose debonding range of the adhesive layer interface and the degradation degree of tensile strength after impact are smaller.At the same time,the tensile load of the joint after impact is mainly concentrated in the 0°ply near the adhesive layer and the failure mode is relatively complex.In addition,under the impact load,the 45°plies in the laminate have smaller deformation and higher shear resistance,which can effectively reduce the laminate impact damage and improve the joint impact resistance.The 0°plies have large deformation and high tensile strength,which can reduce the debonding damage between the adhesive layer and aluminum surface to a certain extent and improve the joint tensile failure load.

关 键 词：异质材料胶接 铺层方式 单搭接接头 低速冲击 拉伸性能 失效形貌 

分 类 号：TB332[一般工业技术—材料科学与工程]