圆柱约束下细长压杆屈曲及后屈曲行为

he buckling and post-buckling behaviors of an elastic rod subjected to both axial force and transverse cylindrical constraints are studied.The axial critical forces of sinusoidal buckling and spiral buckling of slender rod are analyzed by finite element simulation,and the discrimination method for critical point of sinusoidal and spiral buckling is proposed,which is verified by comparison with literature results.The influence of slenderness ratio and boundary conditions on the critical force is also investigated.The results show that the critical forces of sinusoidal buckling and spiral buckling increase with the decrease of the slenderness ratio of the rod.In a certain range of rod length,the influence of end constraint conditions on critical load and buckling mode is not negligible.While the influence of boundary conditions on the critical load can be ignored as the length of the rod is long enough.