Numerical Study On Buckling Of Composite Cylindrical Shell Under The Axial Impact Of Rigid Mass

Composite cylindrical shell have been widely used in aviation,aerospace,machinery,shipbuilding,architecture and other fields due to their excellent structure and material properties.Study on dynamic behavior of composite cylindrical shell has always been hot spots in solid mechanics.Dynamic buckling behavior of composite cylindrical shell under the axial impacted of rigid mass is studied in this paper.The details are as follows:1.The development process and research status of elastic and elastic-plastic dynamic buckling of cylindrical shell are briefly described.2.Considering the stress wave effect,dynamic buckling problem of composite cylindrical shell subjected to rigid mass is studied.Considering the effect of axial inertia and rotational inertia,dynamic buckling control equations,initial conditions and continuity conditions of cylinder shell are obtained by Hamilton principle based on Donnell thin shell theory.3.The dynamic buckling control equations,boundary conditio ns,initial conditions and continuity conditions are dimensionless,which solved by center difference and backward difference.Effects of different boundary conditions,critical lengths,impact speeds,impact masses and lay-up angles on elastic and elastic-plastic dynamic buckling of composite cylindrical shell are discussed by using MATLAB software.The results show:First,with critical lengths increase,dynamic buckling continues to grow,the number of modes gradually increases and higher-order modes are excited.At the same time,peak and trough values increase gradually.It is shown that the stress wave effect has a significant effect on the elastic and elastic-plastic buckling of composite cylindrical shell;Secondly,with the increase of impact masses,impact speeds and lay-up angles,high-order modes are excited;first half wavelength of buckling decreases gradually.What’s more,peak and trough values increase.The results show that axial inertia,impact speeds and lay-up angles have a prominent effect on elastic and elastic-plastic dynamic buckling of composite cylindrical shell.Thirdly,boundary conditions have a notable effect on the dynamic buckling.The clamping boundary is more resistant to buckling deformation.4.Elastic dynamic buckling of composite cylindrical shell under impact of rigid mass is studied by ABAQUS finite element simulation software.Basic model of composite cylindrical shell impact by rigid mass is established.The effects of different impact speeds,different critical lengths,different impact masses and different lay-up angles on dynamic buckling are analyzed by different boundary conditions.The results show that with the increase of critical lengths,impact speeds,impact masses and lay-up angles,the higher-order modes of buckling are excited;the peaks and troughs are increased;and the dynamic buckling will change greatly when the boundary conditions are changed.Compared with the MATLAB programming solution values,the simulation results are good agreement with those obtained by MATLAB programming.It is shown that it is feasible to use differential method to solve dynamic buckling of a rigid cylindrical impact composite cylindrical shell by using differential method.