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文章比较了多应变率处理方式以及不同焊缝模型等因素对单帽型拼焊板结构碰撞结果的影响,对比了焊缝位置和焊点间距等特征参数对其耐撞性的影响。研究考虑3种不同高强度钢的拼焊组合并对比其耐撞特性。结果表明,不同的拼焊材料和厚度会直接导致不同的碰撞变形模式和加速度曲线波形;多应变率曲线能够获得更好的仿真精度;无论是同材异厚组合、异材同厚组合还是异材异厚组合,采用共节点或者刚性连接来模拟焊缝是较为合适的;在保证吸能的条件下,尽可能加大前端区域能够获得更理想的加速度曲线;在保证焊点不发生断裂的条件下,焊点间距或者焊点数目仅影响峰值大小及时刻,并不影响加速度曲线变化的总体趋势。
The article compares the effect of multi-strain rate treatment methods and different welding seam models on the impact results of single-cap Tailor welded plate structure, and compares the influence of the characteristic parameters such as weld location and weld spot spacing on the crashworthiness. The study considers the tailor welded combinations of three different high strength steels and compares their crashworthiness characteristics. The results show that different welding materials and thicknesses will directly lead to different collision deformation modes and acceleration curve waveforms. Multi-strain rate curves can obtain better simulation accuracy. Whether it is the same thickness, the same thickness or different thickness It is more appropriate to simulate the weld joint with a common node or a rigid connection between different thicknesses and thicknesses. In the condition of ensuring the energy absorption, it is possible to obtain a more ideal acceleration curve by increasing the front end area as much as possible. Under the conditions, the spacing between solder joints or the number of solder joints only affects the peak size and the timing, and does not affect the overall trend of the acceleration curve.