Experimental study on load and damage characteristics of typical cabin under warhead internal blast

Objective This study seeks to explore the effects of a protective bulkhead structure on the load and damage characteristics of a typical cabin under warhead internal blast, and guide protective bulkhead design for important ship cabins.

Method A typical double cabin structure model is designed in which the large cabin is used to simulate the explosion cabin, while the small cabin is used to simulate the important cabin. A comparative study is then carried out on the load and damage characteristics of the original bulkhead model and multi-layer liquid-containing protective bulkhead model under an internal explosion of thr shell warhead with 6.12 kg TNT, and an analysis is made of the load characteristics of fragments, shockwaves, structural crevasses, deformation damage characteristics.

Results The fragment flying angle produced by the front end of the warhead is basically the same, and there are fewer fragments at the front end than in the circumferential direction. The presence or absence of a protective bulkhead has little effect on the fragment load characteristics. The explosion shockwave has obvious corner convergence characteristics. The shockwave energy changes with the strength of the structure, and it is easier for the overall energy to pour into the weak parts of the structure. Under the combined damage of shockwave and fragments, the center of the conventional steel transverse bulkhead suffers a large break, while the multi-layer liquid-containing protective bulkhead only suffers large plastic deformation on the projectile-facing surface and perforation by a small number of fragments, with the structure of the projectile backing surface remaining complete. Multi-layer liquid-containing protective bulkheads can effectively prevent the transmission of explosive energy to the adjacent cabin, but they will aggravate the structural damage of the explosion cabin.

Conclusion The "evacuating and blocking" protection design method has important practical application value for the protection of important ship cabins.