近距空爆载荷作用下双层防爆舱壁结构抗爆性能仿真分析

Numerical analysis of blast resistance of double-layer bulkhead structures subjected to close-range air blast

为探讨双层舱壁结构的抗爆性能,采用有限元仿真分析了近距空爆载荷作用下结构的动态响应过程和板材最大有效塑性应变随冲击波载荷强度的变化关系以及结构的失效破坏模式和动态吸能特性,并与相同材料同等重量的传统加筋板架进行了比较,最后对抗爆性能较好的CI型双层舱壁结构进行了结构抗爆的近似优化。研究结果表明:双层舱壁结构能够有效避免局部撕裂失效的破坏模式;相同冲击波载荷作用下,双层舱壁结构吸能较大,但结构板材的最大等效塑性应变却比加筋板架小,因而抗爆性能明显优于加筋板架;通过结构抗爆的近似优化可得到抗爆性能更优的双层舱壁结构,可为工程中双层舱壁结构的选型和抗爆防护结构单元的设计提供参考。

To explore the blast resistance of double-layer bulkhead （DLB） structures, a numerical analysis, using finite element code, was conducted about the structural dynamic response and the varia- tion in the maximum effective plastic strain of the plates with shock wave intensities under the condi- tions of close-range air blast. Also, the failure modes of structures as well as dynamic energy absorp- tion were investigated. DLB structure being and traditional stiffened plate were compared. Finally, an approximate optimization of the blast-loaded structure was carried out for CI type DLB structure bet- ter in resistant performance. The results show that DLB structure can effectively avoid the local tear- ing failure mode. Under the condition of equal shock wave intensity, the energy absorption of the DLB structure is higher while the maximum effective plastic strain of the plate is lower than the stif- fened plate. Consequently,the blast resistance of DLB structure is obviously superior to that of the stiffened plate. Through the structurally approximate optimization, it is possible to obtain a DLB structure better in resistant performance and therefore to provide a reference for the type selection and structural design of blast-resistant DLB structure in engineering.