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对广泛应用在海洋建筑中的夹芯结构的力学性能进行了分析,夹芯结构由玻璃纤维表皮包裹PVC泡沫材料或聚酯核所构成。系统的试验研究和定量评估显示,夹芯结构强度的理论预测和实际破坏机理能被有效位误差所影响,特别是存在剪力荷载的情况下。此外,由于抗剪刚度低及弹性恒定与外壳和核心材料失谐,破坏模式和强度受垂直于夹芯板中部的最终应力的影响。尤其是带有PVC泡沫核的夹芯结构,应力的交互作用导致了外壳与核心的分离破坏,而带有聚酯核的结构致使核剪力粘结破坏。借助精确的非线性模拟,对目前复杂荷载下用于设计阶段的精确的破坏标准也进行了拓展。
The mechanical properties of sandwich structures that are widely used in marine structures are analyzed. The sandwich structure consists of a glass fiber skin wrapped with a PVC foam or a polyester core. Systematic experimental studies and quantitative evaluations show that the theoretical prediction of the strength of the sandwich structure and the actual failure mechanism can be affected by the effective position error, especially in the presence of shear loads. In addition, due to the low shear stiffness and constant elasticity of the shell and the core material, the failure mode and strength are affected by the final stress perpendicular to the middle of the sandwich panel. In particular, the sandwich structure with a PVC foam core, the interaction of stress leads to the separation and destruction of the shell and the core, and the structure with the polyester core causes the nuclear shear force to bond and destroy. With precise nonlinear simulations, the exact destruction criteria for the design phase under complex loads are also expanded.