Analysis of Nonlinear Local Stability of Curved Cross Section Boom

In order to solve the problems of local stability of telescopic boom of truck crane in practical engineering, considering the initial geometric imperfection and the welding residual stress, the nonlinear local stability analysis of telescopic boom was studied by ANSYS software. APDL command flow was used for controlling the analytical process. Firstly, the foundational theories of the nonlinear finite element method were introduced. Secondly, the influence of the initial geometric imperfection and the welding residual stress on the nonlinear buckling of the boom was studied. Finally, the nonlinear buckling critical stress value of the curved cross section boom for an example was obtained, and it was used to compare with the rectangle, hexagon and dodecagon boom, consequently, a conclusion was drawn that the ability to resist bucking of curved cross section boom was stronger.