摘要
拼焊形式构件因配置灵活的优势已成为性能卓越的车身轻量化结构,目前还没有看到相关文献报导拼焊板形式结构件的吸能特性实验研究,故本文选用三种相同外形尺寸但不同组合的单帽型拼焊形式结构件,对轴向冲击载荷作用下的拼焊板组合试件的动态变形及吸能特性进行了实验分析。从动态压溃结果来看,拼焊板的材料和厚度的不同会直接导致实际碰撞加速度曲线波形也不同,即有上升型、平稳型和下降型;从动态变形和加速度来看,如果前后端部件的材料和厚度设计合理,前纵梁就会发生较为理想的褶皱变形。通过不同耐撞性性能参数的比较可知,载荷大小与拼焊板的材料和厚度组合以及焊缝的存在有关,而且载荷效率均达到了50%以上。通过拼焊板形式的组合匹配,可以得到更加平稳的载荷位移曲线,使得压溃变形更加平缓,吸能更加充分。碰撞模式与指标数据均显示拼焊板结构可以作为一种更加柔性的前纵梁吸能结构,可以为工程师们提供有效的设计指导,并为拼焊板结构的应用推广提供直接的基础依据。
Tailor-welded blank(TWB)structure has become a vehicle body light-weight structure with excellent performance due to its flexible configuration advantage.At present,there is no experimental study of TWB energy absorption characteristics in published literatures.So,a comparative experimental study about the dynamic deformation and energy absorption characteristics of TWB assembly specimen subjected to axial impact load was carried out by using three different combinations of single hat type tailor welded structure with the same size,its results are presented in this paper.The dynamic collapse results show that the differences of both material and thickness lead to different impact acceleration curve forms,i.e.,ascending type,steady type and descending type,respectively.Dynamic deformation and acceleration results indicate that if both material and thickness of front and rear end parts are designed reasonably,there will be an ideal front longitudinal fold deformation.The comparison of different performance parameters indicate that the load size is related to the material and thickness combination of TWB and to the existence of soldering seam.The load efficiency has reached more than 50%.A more stable load displacement curve can be obtained by match combination form of TWB,which makes the compression deformation more smoothly and the energy absorption more fully.Collision model and parameters indicate that TWB structure can be as a more flexible front longitudinal beam energy absorbing structure,can provide effective design guidance for engineers and provide direct basis for TWB wider application.
出处
《实验力学》
CSCD
北大核心
2016年第4期483-494,共12页
Journal of Experimental Mechanics
基金
中国汽车产业创新发展联合基金资助(U1564202)
中央高校基本科研业务费专项资金资助(2016IVA037)
机械系统与振动国家重点实验室课题资助项目(MSV201608)
关键词
高强度钢
薄壁管
拼焊板
耐撞性
实验研究
hign-strength steel
thin-walled tube
tailor-welded blanks
crashworthiness
experimental study