中文摘要：

参照美国FMVSS 216和SAE J996标准,对某轿车车顶进行了准静态压溃和整车跌落的仿真研究,提出了准静态压溃和整车跌落下的车顶强度评价方法,分析了车顶作用力与压溃深度的关系以及整车应力分布情况,并对主要力承载结构进行耐撞性研究,提出基于碰撞吸能的改进方案。结果表明：改进后车顶抗变形能力提高了24%,车顶最大变形量减小了34 mm,并且零件质量减轻3.45 kg,该仿真方法为开展车顶强度方面的研究提供了借鉴。

英文摘要：

A comprehensive numerical analysis of roof quasi-static crush and vehicle inverted drop for passenger car was introduced under crushing regulation FMVSS 216 and SAE J996 standard.The evaluation methodology for roof strength under quasi-static crush and inverted drop was brought forward.The relationship between impact force of roof and crush deformation and stress distributions of the car were analyzed.Research on structural crashworthiness to the main load-carrying structures was carried out and optimal project based on energy absorption during impact was put forward.The result shows that roof strength is improved by 24% and the maximum deformation of roof structures is decreased by 34 mm while the weight of modified structures can be reduced by 3.45 kg.The methodology can be used for reference to studies of roof strength.