Abstract：To improve the side crashworthiness of automobile, based on the traditional B-pillar basic structure, a new B-pillar structure with negative Poisson′s ratio inner core was proposed. According to the requirements of C-NCAP, the side impact model was established based on the new B-pillar structure. Taking sample points by the optimal Latin hypercube test design method, the response surface model between each evaluation index and design variable of B-pillar was established. On this basis, the invasion displacement and the invasion speed of B-pillar were used as optimization objective, and the NSGA-Ⅱ optimization algorithm was adopted to improve the new B-pillar structure by the multi-objective optimization design. The results show that the new B-pillar structure can reduce the invasion displacement by 7.44％ with decreased invasion speed by 5.10％, which illuminates that the side crashworthiness of vehicle is significantly improved.
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2020, Vol. 41 
