固化剂对室温胶黏CFRP板/钢板界面性能的影响

Effect of Curing Agent on Interfacial Performance of Adhesively Bonded CFRP Laminate/Steel Plate Cured at Room Temperature

基于自研的纳米SiO_(2)环氧树脂胶黏剂配比,制作了室温固化的21个胶黏剂拉伸试件、20个碳纤维增强复合材料(CFRP)板/钢板双搭接接头试件,进行了胶黏剂拉伸力学指标及搭接试件承载能力、有效黏结长度、传力模式和黏结滑移本构等试验研究,得到了固化剂种类及掺量对搭接试件界面黏结性能的影响规律.结果表明:固化剂种类和掺量不同的7种胶黏剂的拉伸强度依次为GY34(基于缩氨105和聚醚氨D230按质量比1∶2复配的胶黏剂)>GY35(基于聚醚氨D230的胶黏剂)>GY31(基于缩氨105的胶黏剂)>GY2(基于改进酚醛胺GR07的胶黏剂)>GY33(缩氨105和聚醚氨D230按质量比1∶1复配的胶黏剂)>GY1(基于芳香氨BD11的胶黏剂)>GY32(基于缩氨105和聚醚氨D230按质量比2∶1复配的胶黏剂);搭接试件的抗剪承载力依次为GY34-S>GY31-S>GY35-S>GY2-S>GY33-S>GY1-S>GY32-S;GY31-S、GY35-S、GY34-S的破坏模式为CFRP板层离,其界面胶层黏结强度大于CFRP板内层间剪切强度;各CFRP板/钢板搭接接头有效黏结长度为50~80 mm;4种采用单一固化剂粘接的搭接试件的黏结滑移曲线均为双线性三角形模型;采用GY34粘接的搭接试件的黏结滑移曲线为三线性直角梯形,界面韧性能得到提升.

Based on the developed ratio of nano silica adhesive,21 adhesive tensile specimens and 20 carbon fiber reinforced composite(CFRP)laminate/steel plate double lap specimens cured at room temperature were fabricated,and the tests of tensile mechanical indexes of adhesive and bearing capacity、interfacial shear stress distribution、effective bonding length、bond-slip constitutive of the lap joint specimens were carried out.The influence of the type and amount of curing agents on the bond behavior of CFRP laminate/steel plate lap specimens were obtained.The results show that the tensile strength of nano-SiO _(2) epoxy adhesives with different type and amount of curing agents cured at room temperature were GY34(adhesive based on 1∶2 compouding of condensed amine 105 and amino-terminated polyoxypropylene D230)>GY35(adhesive based on amino-terminated polyoxypropylene D230)>GY31(adhesive based on condensed amine 105)>GY2(adhesive based on improved phenalkamine GR07)>GY33(adhesive based on 1∶1 compouding of condensed amine 105 and amino-terminated polyoxypropylene D230)>GY1(adhesive based on aromatic amine BD11)>GY32(adhesive based on 2∶1 compouding of condensed amine 105 and amino-terminated polyoxypropylene D230).The shear capacity of the CFRP plate/steel lap specimens were GY34-S>GY31-S>GY35-S>GY2-S>GY33-S>GY1-S>GY32-S.The failure mode of CFRP/steel lap specimens GY31-S、GY35-S、GY34-S were CFRP laminate delamination,because the bond strength of the interface adhesive layer was greater than the interlaminar shear strength of the CFRP laminate.The effective bonding length of the CFRP laminate/steel plate lap specimens were 5080 mm.The bond-slip curves of the CFRP-steel lap specimens glued by epoxy adhesives with four single curing agents were bilinear triangular models.The bond-slip curve of the CFRP plate/steel plate joints glued by GY34 was a trilinear rectangular trapezoid,interface toughness was improved.