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�������պ����ѧѧ�� 2004, Vol. 30 Issue (12) :1163-1167    DOI:
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Theoretical study on lightweight design of thin-walled beam structure for automobile body
Sun Lingyu, Yao Yingxian*
Dept. of Automobile Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� The main load-supporting elements for an automobile framework are thin-walled beams. To study the effectiveness of lightweighting on the body stiffness, the analytical formulae describing static bending and torsional stiffness of a beam with fixed-fixed supporters were derived firstly. To get a light thin-walled beam structure with optimum section, the influence of every sectional geometry parameter on the stiffness-mass ratio was discussed respectively. After replacing the steel by the lightweight material, the corresponding variations in structural stiffness and size were analyzed. The stiffness-mass ratios of beams with open and close loop sections were also compared with each other. Finally, a few geometrical and material parameters, which can greatly influence the bending or torsional stiffness of these thin-walled beams, were found out. For a typical thin-walled beam applied in an automobile body, the design guideline achieving both lightweight and high stiffness is presented.
Keywords�� thin-walled structures   cross sections   bending stiffness   torsional stiffness   automobile body     
Received 2003-09-12;
Fund:

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About author: ������(1966-),Ů,������«����,������, lysun@mail.tsinghua.edu.cn.
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������, Ҧӭ��.���������ṹ��������Ƶ������о�[J]  �������պ����ѧѧ��, 2004,V30(12): 1163-1167
Sun Lingyu, Yao Yingxian.Theoretical study on lightweight design of thin-walled beam structure for automobile body[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(12): 1163-1167
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