Study On Mechanical Behaviors Of Variable-stiffness Composite Laminates

Unlike traditional composite laminates,the angle of variable stiffnesscomposite laminates is not fixed.The way of laying provide possibility fordesigners,making the design more free.Comparing with those trodational compositelaminates，the laying of the curved-fiber variable stiffness composite laminates hasmany advantages: such as to avoid stress concentration,the potential to reduceweight and to make designer more free. These advantages make variable stiffnesscomposite laminates important in the aerospace field.In this paper, we use the method of simulation to study the mechanicalproperties of composite laminates. On the basis of previous research, we propose anew kind of fiber laying path.The fiber angle of fiber laying path changes with thereference axis.According to the path, we make the simulation possible with thesoftware called ABAQUS.In the numerical simulation,through the method ofdefining the subroutine, put the proposed path into the ABAQUS, completed theestablishment of variable stiffness composite laminates.Changing the laying style and the fiber angle of the laminates,we calculate thebuckling load of the three kinds of laminates:the linear laying,the curve laying andthe mixed laying.By comparion and analysis,we find the best laying style and layingangle.The study provides references for the design of variable stiffness laminates.Variable stiffness composite laminates not only has excellent design, but alsoimprove the buckling load of laminated composite plates, reducing itsweight.Besides,the study of this paper can provide reference for the design andmanufacture of composite pressure vessels.