Researches About The Bonding Performance Of Carbon Fiber Laminated Plates

Because of high specific strength, high specific stiffness,good anti-fatigue performanceand the programmablematerial layer, advanced composite materials become the key ones toimprove product performance and they are widely used in the fields of cars, plane and soon.In the designing of cars, integrated design and manufacture are the important method inorder to improve the structural efficiency.Thus, for the design of the structure ofautomotivecomposite material, the connection design is inevitable.As a kind oflightweight connection technology,bonding is a key technology for the development oflightweight carbody in the future. Compared with the traditional mechanical connection,besides the ideal performance of heterogeneous connection, bondingtechnology has manyadvantages such as good sealing and anti-fatigue performance.Therefore, the investigation ofbond mechanics performance and the study of the typical adhesive joint strength predictionmethod and theorywill not only play a guiding role in the application of thistechnology connection structure and optimization, but also have more far-reaching strategicsignificance on the lightweight development of the domestic automobile and theimprovement of independent research and development.Concerning the above as the background and considering the influence factors ofadhesive joints, the adhesive properties of single lap joint model about T800/924C compositelaminates are studied by means ofthe mechanical analysis and finite element simulation.Main research content can be described as follows:Firstly, we model the single lap joint of the carbon fiber laminates and put forward therelated mathematical functions, moreover, themaximum tensile force which can bear for thisjointis estimated based on the buckling load of adhesive laminate.Secondly, in terms of the beam bending theory, the distribution of normal stress andshear stress at the adhesive joints which are acted the above maximum tensile stress isanalyzed, it is reasonableto estimate the maximum tensile forcebased on the buckling load oflaminated plates. Thirdly,through the finite element analysis software which named ABAQUS, the formermechanics research is compared and proved in terms of the stressdistribution forthe differentthickness of rubber at the adhesive joints.Finally, the future of carbon fiber composite material used in the car cementingperformance research work is prospected.In this thesis, the stressdistribution of adhesive joints, bonding strength and the otherrelated factors are studied according to the stress model of analytic method and finite elementanalysis simulation system.The method by which to estimate the maximum tensile forcebasedon the buckling load of laminated plates is proved to be feasible.These results will providestrong guidance to the use of cementing technology for lightweight composite materials.