Abstract:

Aiming at the warping problem of some elements in the finite element analysis of bus rollover， the four?node thin shell element is improved with warp correction first. Based on the improved four?node thin shell element and the total strain theory， a new type of four?node DKT combined thin shell element is constructed by combining the DKT four?node thin plate element with the traditional four?node isoparametric membrane element. Then the four?node Mindlin shell element used in the one?step collision initial algorithm for bus rollover is replaced by the new DKT element， with the initial algorithm improved. Finally， the improved algorithm is applied to the rollover simulation of the typical body section model for a 12m highway bus and its result is compared with those of initial algorithm， LS?DYNA and real bus rollover test， verifying the effectiveness of the constructed new type of four?node DKT combined thin shell element in practical engineering application.

Key words: bus rollover, wrap modification, new type of DKT combined thin shell element, one?step collision algorithm, total strain theory