玻璃纤维/树脂复合材料缠绕空心玻璃微珠/树脂实芯球形结构单元耐撞能量耗散机制

提出并设计了一种新型的玻璃纤维/树脂复合材料缠绕空心玻璃微珠/树脂实芯球形结构单元。为探讨其在低速大质量冲击载荷作用下的约束损伤演变特征和耐撞能量耗散机制，通过ABAQUS建立该结构单元的数值分析模型并开展了低速大质量冲击试验研究。数值模拟与试验结果对比分析表明，该结构单元耐撞性设计的关键在于表层与内部球形浮力芯材的泊松比匹配性设计。内部球形浮力芯材在环向泊松较低表层约束应力的控制下发生平稳的塑性压缩损伤和剪切断裂破坏，表层在内部球形芯材横向膨胀效应的作用下发生渐进式环向拉伸断裂破坏，呈现花瓣形损伤破坏特征。结果表明，该新型结构单元不仅具有优异的耐撞能量耗散特性，同时能为水下结构平台提供一定的储备浮力。

Energy dissipation mechanism of glass fiber/resin composite wound hollow glass microspheres/resin solid ball element under impact loading

The new energy absorption structure of glass fiber/resin composite wound hollow glass microspheres/resin solid ball element had been put forward. In order to investigate the damage evolvement law and energy dissipation mechanism of the element, the numerical analysis model was built by ABAQUS and the experiments were conducted under low-velocity and large-mass impact loading. Comparative analysis of numerical simulation and experimental results show that the key to the crashworthiness design of the structure was the compatibility design of the Poisson' s ratio between the surface and solid buoyant core.The smooth plastic compression damage and shear failure of the solid buoyant core come to occur due to the constraint stress of the composite surface with lower Poisson's ratio. The progressive tensile breaking of the composite surface is caused by transverse expansion deformation of the solid buoyant core and the petal shaped damage appears. The results show that this new structure has good energy dissipation property and provide certain reserve buoyancy.