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发表时间：2016-01-01

发表刊物：计算力学学报

所属单位：运载工程与力学学部

期号：4

页面范围：528-535

ISSN号：1007-4708

摘要：Thin-Walled beams (TWB ) are the most important kind of impact protection devices of automobiles and other vehicles.Research on the lateral crashworthiness and its improvement method, besides the axial crashworthiness,is very important.In this paper,a method to improve the lateral crash-worthiness of variable thickness thin-walled beam(VTWB)through reasonably designing the thickness distribution was studied,and a hybrid cellular automata based method for designing the thickness distri-bution was proposed.Based on the performance requirements and structural characters of an automobile B-pillar,the thickness distribution is designed firstly for optimization of the lateral crashworthiness of a simply supported VTWB.The penetration displacement has an 82% decrease from that of the uniform thin-walled beam,which proved the effectiveness of the design.Then,considering the convenience to manufacture through flexible rolling technology,the VTWB with wall thickness varying along axial direction was given.The penetration displacement in this design has a 73% decrease from that in the uni-form thin-walled beam.The reduction of the penetration displacement is slightly decreased compared with that of the VTWB with 3D thickness distribution,but the manufacturing is much more convenient. The design examples indicate that variable thickness design can effectively improve the lateral crashwor-thiness of the thin-walled beam.The proposed method can get a reasonable thickness distribution of VTWB,and thus it is an effective optimization design method for lateral crashworthiness.

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