Investigation Of Titanium-Carbon Fiber Metal Laminates Bolted Joint

Ti-C fiber metal laminates(Titanium-Carbon fiber metal laminates,hereafter referred to as Ti-C FMLs)are based on alternated stacking arrangements of carbon fiber-reinforced composites plies and Titanium alloy layers.The Ti-C FMLs combines the advantages of Titanium and carbon fiber-reinforced composites.The combination not only overcomes the Titanium’s shortcomings of short fatigue life and low strength,but also surmounts these deficiencies of weak impact resistance and reparability of composites.The excellent properties of Ti-C FMLs are attracting more and more attention in aerospace industry.This paper has selected blasting to pre-treat titanium and the hot compression molding process was adopted to manufacture the Ti-C FMLs.In order to enhance the bonding strength,Titanium layers and carbon fiber-reinforced composites layers were bonded together with adhesive film.The natural frequencies of Ti-C FMLs were investigated using MSC.PATRAN/NASTRAN,and the effects of the volume fraction of the Titanium sheet on natural frequency were also studied.It was shown that the larger sample size produces better correlation and the frequency of the Ti-C FMLs decreases with the increase of the volume fraction of the Titanium sheet.In addition,this paper tested the failure mode of the double shear-single fastener tests and the open hole tensile tests,according to the ASTM standards test methods of fiber reinforced composite.Then the progressive damage process was analyzed using ABAQUS User Material(UMAT).Finally,this paper has investigated the mechanical design of the joints between metal joints and composite beams,which was base on the design of one wing main beam joint structures.The pin load distribution and the joint strength have been studied,then the optimized design has been selected between three joint structures.