高速冲击载荷作用下钎焊蜂窝夹层板动态响应

Dynamic Response of Brazed Honeycomb Sandwich Panel under High-speed Impact Load

中文关键词: 蜂窝夹层结构  动态性能  冲击损伤  剩余强度  高温合金

英文关键词: honeycomb sandwich structure  dynamic property  impact damage  residual strength  superalloy

中文摘要:

      目的 以钎焊高温合金蜂窝夹层板为研究对象，分析其在弹丸高速冲击作用下的力学性能。方法 采用轻气炮冲击加载试验结合有限元模拟，对蜂窝夹层板开展不同冲击强度下的动态响应和失效研究。开展含高速冲击损伤的蜂窝夹层板侧压试验，研究损伤模式对剩余强度的影响。结果 冲击强度对夹层板的失效过程和失效模式有着明显的影响，当冲击条件不足以使得迎弹面发生侵彻时，夹层板失效为表面压痕损伤;随着冲击强度的提高，出现不同程度的局部芯层压缩;当冲击强度大于临界值时，迎/背弹面陆续被侵彻，夹层板出现侵入损伤及贯穿损伤。结论 高速冲击损伤使得蜂窝夹层板的侧压失效模式，由理想塑性屈曲转变为局部失稳，侧压极限载荷大幅降低。

英文摘要:

      The work aims to analyze the mechanical properties of the brazed high temperature alloy honeycomb sandwich panel under the high-speed impact of projectile. The dynamic response and failure of the honeycomb sandwich panel under different impact strength were studied through the light-gas gun test combined with FE simulation. The lateral compression experiment of the honeycomb sandwich panel with high-speed impact damage was carried out to study the effect of damage modes on the residual strength of the sandwich panel. Results showed that the impact strength had obvious influence on the failure process and failure mode of the sandwich panel. When the impact strength was not enough to penetrate the front face, the failure mode of the sandwich panel is indentation damage. With the increase of impact strength, different degrees of local core compression appeared. When the impact strength was greater than the critical value, front face and rear face were penetrated, the sandwich panel had intrusion damage and penetration damage. The high-speed impact damage causes the lateral compression failure mode of the honeycomb sandwich panel to change from ideal plastic buckling to local instability, and the limit load of lateral compression is greatly reduced.