铝合金-丁腈橡胶航空带垫卡箍典型环境损伤研究  

Damage on Aluminum Alloy-Nitrile Rubber Aeronautic Clamp with Cushion in Typical Environments

作　　者：李刚[1] 李明[1] 杨小奎[2] 向江涛[2] LI Gang LIMing YANG Xiao-kui XIANG Jiang-tao(Aviation Industry Corporation of China, Beijing 100028, China Southwest Technology and Engineering Research Institute, Chongqing 400039, China)

机构地区：[1]中国航空综合技术研究所,北京100028 [2]西南技术工程研究所,重庆400039

出　　处：《装备环境工程》2017年第6期65-71,共7页Equipment Environmental Engineering

摘　　要：目的研究典型环境对丁腈橡胶-铝合金带垫卡箍的损伤效应。方法通过模拟铝合金-丁腈橡胶航空带垫卡箍使用时的装配结构和应力状态,应用GJB 150A—2009中的湿热和太阳辐射两种典型老化环境,采用宏观形貌观察、卡箍保持力测试和橡胶衬垫拉伸性能测试方法,结合扫描电子显微镜和傅里叶红外光谱技术,分析带垫卡箍的性能劣化过程。结果带垫卡箍在湿热和太阳辐射环境中老化50 d后,卡箍橡胶衬垫表面出现大量微孔缺陷,拉伸性能大幅降低,导致卡箍保持力分别下降了35%和51%。结论带垫卡箍在模拟装配状态下进行湿热和太阳辐射环境暴露实验,卡箍橡胶衬垫内部结构由致密逐渐变得疏松,部分碳碳双键发生氧化交联反应,并在一定程度上提高了聚合物的交联密度,材料硬度提高,回弹性能减弱,橡胶衬垫对芯轴的包裹能力降低,导致卡箍保持力性能降低。Objective To study damage effect of typical environments on aluminum alloy-nitrile rubberaeronautic clamp with cushion. Methods According to the GJB 150A--2009 standard, the damp heat aging experiments and solar radiation aging experiments of aluminum alloy - nitrile rubber aeronautic clamp with cushion were carried out with the simulation of its assemble structure and stress state. The performance degradation process of the clamp was analyzed with macroscopic topography, clamp retention force test and tensile property test of rubber cushion, combined with the tech- nologies of SEM and FTIR. Results After 50 days of aging in the damp heat and solar radiation environment, many mi- croporous defects appeared on the surface of the rubber cushion, and the tensile properties were greatly reduced. The retention force of clamp decreased 35% and 51% respectively. Conclusion The inner structure of the rubber cushion of simulated assembly state in damp heat and solar radiation environment is gradually loosened, and some carbon-carbon double bonds are oxidized and cross-linked, and to a certain extent, the intercalation reaction of the rubber gaskets is improved. The crosslinking density of the polymer increases, the hardness of the material increases, the rebound resilience decreases, and the packing capacity of the rubber liner against the mandrel decreases, resulting in a decrease in the retention performance of the clamp.

关 键 词：带垫卡箍 丁腈橡胶 湿热 太阳辐射 保持力 

分 类 号：TJ07[兵器科学与技术—兵器发射理论与技术]