Citation

Lei ZB, Yu JX, Yan HQ, Zhou ZG, Zhou PY. Zhendong yu Chongji 2007; 26(7): 13-17.

Affiliation

School of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410076, China

Copyright

(Copyright © 2007, Zhen dong yu chong ji bian ji bu)

DOI

unavailable

PMID

unavailable

Abstract

In order to design interrupted type of concrete guardrails for highway in mountain area to satisfy collision safety request, using the method of orthogonal design (MOD) and the dynamic explicit finite element method (EFEM), taking passenger's head injury criterion (HIC) value as a check index, design parameters for the interrupted type of concrete guardrails are optimized. An orthogonal design table L(sub)25(/sub)(5(sup)6(/sup)) is used, 6 design variables and 5 levels for each variable are considered. Based on eta/VPG and LS-DYNA software and a integrated model of 'automobile-guardrail-passenger-seat-safety belt', total 25 simulation tests are carried on. In the integrated model established here, a big truck with length of 8575 mm, width of 2445 mm, height of 3278 mm, weight of 10000 kg and height of 1212 mm for its gravity center is used. At the driver seat inside the truck, a 50 percent adulthood male dummy with weight of 78 kg is put on, a safety belt with thickness of 1.2 mm and three-point fixed is used. The truck with speed of 60 km/h, in the direction with a 20 degree angle to the lengthwise of the guardrail crashes the concrete guardrail. The analysis of variance for the results of the 25 simulation tests is done by using the statistical package for social sciences (SPSS) and the optimal design parameters for the interrupted type of concrete guardrails are given. It is found that only 3 design variables of all 6 ones are significant, i.e., the length of the concrete frustum, the distance between two concrete frusta and the slope down height of infrastructure. For these 3 design variables, their best levels should be selected because the level changes will make the check index be obviously different. For the other 3 nonsignificant variables, their levels can be selected according to the engineering requirement. The results indicate that if the design parameters are reasonable, then the interrupted type of concrete guardrails can have stronger energy-absorbing ability and a certain steerable ability to lead to the vehicle lost control to return the right running direction.