Post-buckling Deformation Analysis Of Composite Structure In Engineering

For structural design,light weight,high strength,energy and sound absorbing are the advantages of composite structures.Therefore,they are widely used in aerospace,civil engineering,machinery and other fields.Stability analysis has always been an important part of structural design.This paper introduces the post-buckling displacement control equations,calculation methods,displacement curves and examples of clamped-clamped and clamped-free composite structures,which can support practical applications and designs.After two analytical approximations,the explicit expressions of load and deformation under two engineering conditions are given.And the approximate solutions are well fitted to the numerical solution obtained by shooting method.Besides,the simulation of the two engineering conditions is carried out for the engineering examples of the existing literature,which means the correctness of the method is verified.Based on existing research on composite clamped-clamped beams,reconstruct the governing equation.By using the tangent deflection angle at the quarter of the beam as an independent variable for approximate analytical solution analysis,an explicit expression for the load and deformation is given.For composite clamped-free beams with interlayer slip consideration,assume that the external forces loaded by each composite part are located at the centroid of each end.It can be confirmed that the two sub-component beams slip after the ultimate buckling load.They do not separate.The stability problem of two shear-connected Euler-Bernoulli cantilever beams was studied.It is assumed that the interlayer contact faces produce a uniformly distributed slip force or interlaminar shear stress.The control equation of the post-buckling deformation of the composite cantilever beam is given for the constant shear joint strength between the layers.The rotation angle of the free end of the beam is used as an independent variable for the approximate analytical solution.An explicit expression for the load and deformation is given.For a cantilever composite beam considering interlayer slip,the joint strength between the contact faces is given.The contact problem was analyzed.Finally,the approximate analytical solution is used to reduce the dimension.The load-displacement curve is drawn according to the finite element analysis results and the approximate analytical solution.The effects of various parameters on the results are comprehensively analyzed,and the correctness of the calculation method and the practicability in engineering design are also verified.