分层泡沫铝夹芯球壳对近场水下爆炸的响应

Responses of Spherical Sandwich Shells with Graded Aluminum Foam Cores subjected to Near-field Underwater Explosion

通过耦合间断伽辽金法和有限元法,将爆炸气泡和水模拟为一维球对称问题、分层泡沫铝夹芯球壳模拟为二维轴对称问题,进而求解分层泡沫铝夹芯球壳在近场水下爆炸载荷下的流体与结构响应,分析了夹芯泡沫分层对流固耦合作用和抗冲击性能的影响。分析结果表明,软芯层靠近水排列能够降低爆炸载荷输入到结构的总能量,强芯层靠近水排列能够更有效地对结构加以防护。

The fluid and structural response of spherical sandwich shells with graded aluminum foam cores subjected to near-field underwater explosion are solved by coupling discontinuous Galerkin method and finite element method. The explosion bubble and water are modeled as one-dimensional spherical symmetric problem,and the spherical sandwich shells with graded aluminum foam cores are modeled as two-dimensional axisymmetric problem. The effects of graded aluminum foam cores on the fluid-structure interaction and blast resistance are discussed. The results indicate that the soft foam cores which are arranged near water can reduce the shock energy transmitted to the structure,and the hard foam cores which are arranged near water can improve the shock mitigation capability of structure.