Composite Materials And Match The Performance Of Aluminum Structural Parts Of The Repair Aviation

In this study, patch composite materials were fabricated through employing carbon fiber or carbon-glass fiber as reinforcement material and employing E-44 epoxy resin as matrix under three different plying models such as unidirection. orthotropic and quasi-isotropy. The aeronautic aluminium alloy components accompanyed with a inner hole were brushed coating or immersed coating with K.H-560 silane coupling agent, or SY-D9 adhesive followed by KH-560 to protect the metal surface from corrosion.Laser thermo-conductor, high resolution TEM were used to investigate the thermo or mechnical matching between composite patch and aluminium alloy components.The interface inside the fixing region were observed directly by SEM or TEM and thereby the corrosion mechanism was analyzed. Under finite element programme, via examining the mechanical property, the repairing effect from different types of composite patchs on the aluminium sheets with a center hole were also studied.It were shown that carbon mixed with glass fibers (under quasi-isotropy plying) used as patch to repair aluminium sheets with a center hole could meet the demond of bonding-repair.Compared with carbon fiber composite, the thermo-expansion coefficient was increased from 1.01×10-6K-1 to 3.41×10-6K-1, mostly approaching the thermo-expansion coefficient of aluminium alloy. It was found from the Cf/epoxy working at atmosphere examination, by SEM, TEM and HRTEM, that along axis dirction of the fiber dot corrision and aperture corrision cooured onside the skin of the aluminium sheet and the corrision product was aluminium oxide.Coating KH560 silane coupling agent and SY-D9 adhesive onside the aluminium skin could effectly control the corrsion and increase the fatigue life-span from 6400time to 20000 times.