Optimizing crashworthiness design of square honeycomb structure
来源期刊：中南大学学报(英文版)2014年第3期
论文作者：LI Meng(李萌) 邓宗全 GUO Hong-wei(郭宏伟) 刘荣强 DING Bei-chen(丁北辰)
文章页码：912 - 919
Key words：crashworthiness; square honeycomb; response surface methodology; numerical simulation; multi-objective optimization
Abstract: To provide theoretical basis for square honeycombs used as crashworthy structures, energy-absorption properties of metal square honeycombs and the size optimization were performed. Specific energy absorption (SEA) was defined as the energy absorbed by the honeycomb structure per unit volume. This parameter was often used for determining the crashworthiness of thin-walled structures. In order to find the most optimized metal square honeycomb structure with the maximum SEA and the lowest peak stress, the cell length and the foil thickness of the metal honeycombs were optimized, with a low peak stress and a high SEA set as the two primary objectives. The pre-processing software Patran was used to build FE models, and the explicit solver LS-DYNA was employed to perform the crashworthiness analyses. The results show that the square honeycomb exhibits good energy absorption performance in some cases. The geometry is effective using 16.8% less buffer structure volume than the hexagonal honeycombs with a peak stress limitation of 1.21 MPa.
LI Meng(李萌), DENG Zong-quan(邓宗全), GUO Hong-wei(郭宏伟), LIU Rong-qiang(刘荣强), DING Bei-chen(丁北辰)
(School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract:To provide theoretical basis for square honeycombs used as crashworthy structures, energy-absorption properties of metal square honeycombs and the size optimization were performed. Specific energy absorption (SEA) was defined as the energy absorbed by the honeycomb structure per unit volume. This parameter was often used for determining the crashworthiness of thin-walled structures. In order to find the most optimized metal square honeycomb structure with the maximum SEA and the lowest peak stress, the cell length and the foil thickness of the metal honeycombs were optimized, with a low peak stress and a high SEA set as the two primary objectives. The pre-processing software Patran was used to build FE models, and the explicit solver LS-DYNA was employed to perform the crashworthiness analyses. The results show that the square honeycomb exhibits good energy absorption performance in some cases. The geometry is effective using 16.8% less buffer structure volume than the hexagonal honeycombs with a peak stress limitation of 1.21 MPa.
Key words:crashworthiness; square honeycomb; response surface methodology; numerical simulation; multi-objective optimization
