| Naval ship was the major weapons platforms in the sea warfare today and it was attacked mainly. As a large target and found easily, it plays a key role on the battlefield. The transverse bulkhead structure is an important guarantee of the ship’s safety and vitality. It is related to the safety of the important sections of the ammunition compartment and the security cabin and the engine cabin. Piercing and semi-armor-piercing can penetrate the ship’s side shell and explode in the cabin, a large amount of high speed fragments appear and penetrate the hull structure, making the ship out of fighting even sink. So, research on dynamic response and protective properties of the ship’s bulkhead structure and design an excellent anti-knock anti-penetration performance of the new bulkhead structure type have great practical significance and military value to improve the ship’s anti-knock ability and vitality.Based on the penetration theory of the fragment on target, the dynamic response caused by fragment penetrating bulkhead was studied with the transient dynamic software. Firstly, do numerical study on the process of high-speed fragment penetrating bulkhead, simplifying bulkhead structure and determining penetration point position and mesh size and so on are included. And then the finite element analysis method of high-speed fragment penetrating double bulkhead is got. Secondly, based on the method of the fragment penetrating the target and the advantages of the sandwich as strongly design, easily energy absorption and less complex constructed, the X-type, Y type, round type and hybrid type sandwich double bulkheads are designed. Then take the X-sandwich double bulkhead as example, the dynamic response of double bulkhead structure in the penetration loads was studied. thirdly, do comparative study of the four new anti-sandwich double bulkheads’ penetrating protective properties and get the excellent anti-penetration protection performance double bulkhead structure. Finally, orthogonal test method was used to optimize the design of the bulkhead structure, the double bulkhead structure parameters contains the panel and backplane thickness, the sandwich panels thickness, the sandwich structure spacing and so on.The main research contents are listed below:(1) Penetration theory and its simulation method validation was studied. It contains target and penetrating type of classification, target and projectile damage forms and mechanism of thin penetrating. This is expounded for the follow-up numerical study on the process of high-speed fragment penetrating double bulkhead with sandwich.(2) Simulating the process of high-speed fragment penetrating the double bulkhead with the software MSC.Dytran. According to the characteristics of bulkhead structural damage, do a series of studies on double bulkhead structure simplicity, mesh size, material model, load model and boundary conditions and so on.(3) Study on dynamic response of high-speed fragment penetrating new sandwich double bulkhead. Firstly, based on the method of the fragment penetrating the target and the advantages of the sandwich as strongly design, easily energy absorption and less complex constructed, the X-type, Y type, round type and hybrid type sandwich double bulkheads are designed. Secondly, take the X-sandwich double bulkhead as example, the dynamic response of double bulkhead structure in the penetration loads was studied. thirdly, do comparative study of the four new anti-sandwich double bulkheads’ penetrating protective properties and get the excellent anti-penetration protection performance double bulkhead structure.(4) Study on the parameters optimization of the new double bulkhead structure. In view of the double bulkhead structure obtained before, with orthogonal test method, the double bulkhead panel thickness, backplane thickness, sandwich thickness and sandwich spacing and so on were optimized, and ultimately the best anti-fragment penetration performance of the bulkhead structure was obtained. |
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