连接方式对蜂窝夹芯结构抗爆性能的影响规律研究

Influence of Connection Mode on Blast Resistance of Honeycomb Sandwich Structures

中文关键词:  316L不锈钢  蜂窝夹芯结构  连接方式  近场空爆  抗爆性能

英文关键词:316L stainless steel  honeycomb sandwich structure  connection mode  near-field air blast  blast resistance performance

中文摘要:

      目的 旨在探究近场空爆载荷作用下蜂窝夹芯结构面板与芯层的连接方式对抗爆性能的影响。方法 分别设计了由激光选区熔化技术打印制备的316L不锈钢一体式蜂窝夹芯结构和分离式蜂窝夹芯结构2种构型，并进行了50 mm爆距的爆炸冲击实验。后又结合数值模拟方法对比分析了一体式、分离式、胶接式和焊接式4种连接方式在爆炸载荷作用下的动态响应过程，并分别从各层结构变形失效、背板最大残余挠度及吸能等角度联合揭示了抗爆性能差异及其影响规律。结果 一体式蜂窝夹芯结构背板最大残余挠度为17.5 mm，相比分离式、胶接式和焊接式，分别减少了47.3%、43.0%、28.3%。爆炸冲击结束后，一体式蜂窝夹芯结构的总塑性应变能和背板应变能占比分别为866.9 J、13.3%，与焊接式蜂窝夹芯结构的相近，但其总塑性应变能较分离式、胶接式分别低4.1%、16.6%，而背板应变能占比则较二者分别低13.8%、14.3%。结论 通过实验与仿真研究，证明了连接强度对蜂窝夹芯结构抗爆性能具有显著的影响，其中一体式结构抗爆性能表现最佳，且连接强度越高，其运动速度越小，响应时间也越短，对其提升防护结构的减震效果具有重要作用。

英文摘要:

      The work aims to investigate the influence of different connection molds between the panels and the core layer of honeycomb sandwich structures on the blast resistance. Two configurations of honeycomb sandwich structures, namely, integrated and separated honeycomb sandwich structures, were designed and prepared by laser powder bed fusion technology using 316L stainless steel. Explosive impact experiments were conducted with a 50 mm stand-off distance. Combined with numerical simulation, the dynamic response processes of the four connection molds (integrated, separated, bonded, and welded) under explosive loads were compared and analyzed. The difference of antiknock performance and its influence rule were revealed from the angle of deformation failure of each layer structure, the maximum residual deflection and the energy absorption of the back plate. The maximum residual deflection of the back plate in the integrated honeycomb sandwich structure was 17.5 mm, which was 47.3%, 43.0%, and 28.3% less than that of the separated, bonded, and welded types, respectively. The total plastic strain energy and the back plate strain energy for the integrated honeycomb sandwich structure were 866.9 J and 13.3%, respectively, which were close to those of the welded type. However, its total plastic strain energy was 4.1% and 16.6% lower than that of the separated and bonded types, respectively, and the back plate strain energy was 13.8% and 14.3% lower than the two, respectively. Experimental and simulation studies demonstrate that the strength of the connection in a honeycomb sandwich structure has a significant impact on its blast resistance performance. The integrated structure exhibits the best performance in this regard. Additionally, as the strength of the connection increases, the speed of movement and response time decrease, which is crucial for enhancing the protective structure's vibration damping effect.