复合材料RTM十字型接头疲劳性能对比实验研究  

Experimental Investigation on Fatigue Behaviour of RTM Composite Cross-joints

作　　者：罗楚养[1] 熊峻江[1] 程泽林[1] 李宏运[2] 彭勃[2] 

机构地区：[1]北京航空航天大学飞行器运用系,北京100083 [2]北京航空材料研究院,北京100095

出　　处：《材料工程》2009年第1期74-76,80,共4页Journal of Materials Engineering

基　　金：航空科学基金资助项目(05A510011)

摘　　要：测试了复合材料RTM十字型接头疲劳性能,分析对比RTM、缝纫RTM和共胶接3种不同成型工艺十字接头的疲劳强度,结果表明:RTM成型十字接头具有良好的疲劳性能,缝纫RTM接头仅为前者的1/4,而先固化后胶接接头最低。研究还发现,复合材料疲劳寿命对成型工艺非常敏感,导致试验结果存在严重分散性。RTM和缝纫RTM的接头破坏都是从根部富树脂区的尖端率先产生裂纹,然后裂纹沿着富树脂区和玻璃布的界面向下扩展,直至接头的整体破坏;先固化后胶接接头则表现为中间层板和T接头的胶层拉伸破坏。Fatigue experiments of three kinds of composite cross-joints, processed respectively by using resin transfer moulding（RTM）, stitched RTM and co-bonding techniques, were carried out to investigate the influences of processing on fatigue behaviour, and failure mechanism was then discussed from the experimental observation. The results show that the RTM cross-joint has the highest fatigue strength in three kinds of cross-joints and the stitching and co-bonding processes have significant influences on fatigue strength of joints. Experimental observations show that the de-lamination firstly appears at upper angular point in resin-rich triangular zone of tee-joint and then propagates along the interface between resin-rich triangular zone and curved web/flange until the bottom plate, subsequently, grows along the horizontal bottom plate till failure of joint.

关 键 词：复合材料 RTM 缝纫 胶接 十字接头 疲劳性能 

分 类 号：TB332[一般工业技术—材料科学与工程]