【摘要】 为探究316L不锈钢蜂窝夹芯结构抗爆性能，设计了一种蜂窝夹芯结构，并采用316L不锈钢粉末通过选区激光熔融(selective laser melting, SLM)制备，同时采用该方法制备等面密度实心板作为对照组。通过静爆实验、LS-DYNA仿真实验得到该结构在近场静爆载荷下的力学行为，并且对应力波在其中的传播方式进行探究以明确其抗爆原理。同时在此基础上利用Optistruct对该结构进行拓扑优化以及结构优化，以期进一步提升抗爆性能。研究结果表明，多孔夹芯结构相比传统实心面板背板挠度降低13.2%,抗爆性能有所提升。建立的流固耦合数值模型描述了静爆实验的3个阶段，即冲击波传播阶段、流固耦合阶段和惯性作用阶段；明确静爆实验中靶板中心处“川”字形裂纹产生是残余芯层挤压导致的，芯层变形失效机理为蜂窝板平面内拉伸撕裂。Optistruct优化结果呈现三角形骨架和圆形孔洞交替波纹板结构，优化后波纹芯靶板相比优化前传统蜂窝夹芯板在相同的爆炸载荷下背板挠度降低25.4%,板后压力峰值降低17.6%,抗爆性能提升明显。相比蜂窝板，圆孔结构可以使背板挠度降低38.1%,三角孔结构可以使板后压力峰值降低22.4%。更多还原

【Abstract】 In order to investigate the blast resistance of a 316L stainless steel honeycomb sandwich structure, a honeycomb sandwich structure was designed and fabricated using 316L stainless steel powder by selective laser melting(SLM). Concurrently, solid panels of equivalent surface density were produced by this method and constituted the control group. The mechanical behavior of the structure under near-field static explosion load is obtained through static explosion experiments and LS-DYNA simulation experiments, and the propagation mode of the stress wave within it is investigated in order to elucidate the underlying anti-explosion principle. Moreover, optistruct is utilized to optimize the topology and structure of the structure, with the objective of enhancing its blast resistance. The findings indicate that the backplate deflection of the porous sandwich structure is diminished by 13.2% in comparison to that of the plate with isoplanar density, thereby enhancing blast resistance. The established numerical model of fluid-solid coupling is capable of describing the three phases of the static explosion experiment, namely the shock wave propagation phase, the fluid-solid coupling phase, and the inertia phase. The explosion experiment yielded definitive results at the center of the target plate, thereby demonstrating that the "川" crack is caused by residual core layer extrusion. Moreover, the core layer deformation failure mechanism for the honeycomb panel was observed to manifest as in-plane stretching and tearing. The optistruct optimization results demonstrate the formation of a triangular skeleton and circular holes, alternating with corrugated plates. The structure, optimized for a corrugated core target plate, displays enhanced resilience in comparison to the optimization of a traditional honeycomb sandwich panel. The explosion load backboard deflection exhibited a 25.4% reduction, the peak pressure behind the plate demonstrated a 17.6% reduction, and the blast resistance was significantly enhanced. In comparison to honeycomb panels, the circular hole structure has been demonstrated to reduce the backplane deflection by 38.1%, while the triangular hole structure has been shown to reduce the peak pressure behind the plate by 22.4%.更多还原