胶粘剂对固体发动机复合材料壳体多材料界面处粘接强度的影响  

Effect of adhesive on bond strength at multi-material interface of SRM composite case

作　　者：袁金 冯彬彬 孟宪慧 张雄军 曹启 YUAN Jin;FENG Binbin;MENG Xianhui;ZHANG Xiongjun;CAO Qi(Ningbo Shuxiang New Materials Co.,Ltd.,Ningbo 315000,China)

机构地区：[1]宁波曙翔新材料股份有限公司,宁波315000

出　　处：《固体火箭技术》2022年第4期601-607,共7页Journal of Solid Rocket Technology

基　　金：宁波市“甬江引才工程”创新团队项目(2021B-020-B)。

摘　　要：针对固体火箭发动机复合材料壳体多材料界面可能产生脱粘的问题,对钛合金/碳纤维复合材料(CFRP)层/橡胶绝热层/胶粘剂的界面粘接性能进行研究。对比不同胶粘剂粘接的钛合金与橡胶(丁腈橡胶(NBR)、三元乙丙橡胶(EPDM))、CFRP与橡胶、CFRP与钛合金层间剪切强度试验测试结果及破坏形式,并结合吸附理论、橡胶与胶粘剂分子结构、反应机理分析测试结果产生差异的原因。结果表明,采用730胶粘接的NBR/钛合金、NBR/CFRP层间强度明显高于Chemlok 252胶粘接的EPDM/钛合金、EPDM/CFRP层间强度,分别提高了224.24%、102.91%。对于CFRP/钛合金界面,Chemlok 252胶粘接后层间强度反而比730胶粘接的层间强度提高了92.34%,这是由于730胶溶剂挥发后为弹性体,层间剪切强度主要是弹性体本身强度,而Chemlok 252挥发后为薄膜,层间强度主要由环氧树脂提供。In order to solve the problem of debonding at multi-material interface of SRM composite case,the interfacial bonding properties of titanium alloy/carbon fiber composite(CFRP)layer/rubber insulation layer/adhesive were studied.The interlayer shear strength test results and failure modes of titanium alloy and rubber(Nitrile Butadiene Rubber(NBR),Ethylene Propylene Diene Monomer(EPDM)),CFRP and rubber,CFRP and titanium alloy bonded by different adhesives were compared.Combined with adsorption theory,molecular structure of rubber and adhesive,and reaction mechanism,the reasons for the difference in test results were analyzed.The results showed that the interlayer strength of NBR/titanium alloy and NBR/CFRP bonded by 730 adhesive was significantly higher than that of EPDM/titanium alloy and EPDM/CFRP bonded by Chemlok 252 adhesive,which was increased by 224.24%and 102.91%respectively.For CFRP/titanium alloy interface,the interlayer strength after bonding with Chemlok 252 adhesive was 92.34%higher than that after bonding with 730 adhesive.This is due to the fact that 730 adhesive becomes an elastomer after solvent volatilization,and the interlayer shear strength is mainly the strength of the elastomer itself,while Chemlok 252 adhesive becomes a film after solvent volatilization,and the interlayer strength is mainly provided by epoxy resin.

关 键 词：固体火箭发动机 复合材料壳体 粘接结构 界面粘接强度 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]