孔柱锥度对纤维柱增强夹芯结构压缩性能的影响OA北大核心

In order to study the influence of the taper of the pore column on the compression performance of the core structure,15 sets of fibre column reinforced composites with different tapered pore columns were designed and prepared.Quasi-static compression experiments and numerical simulations were carried out on the prepared sand-wich structures to investigate the effects of hole-column taper and core thickness on the compressive strength,mod-ulus,specific strength and failure mode of the sandwich structures.The results show that for sandwich structures with core thicknesses of 25 mm,30 mm and 35 mm,the increase in hole-column taper from 0° to 16° increases the compression strength by 14.7％,22％and 24.8％,the compression modulus by 25.9％,31.6％and 37.7％,re-spectively,and the specific strength by 4％,9.95％and 10.24％.Failure of core structures with small and non-ta-pered pore columns is in the form of buckling and fracture of the fibre column,with the location of buckling and fracture gradually shifting towards the smaller end of the pore diameter as the taper of the column increases.When the taper of the hole column is raised to 16°,part of the core structure with the smaller aperture end of the fibre col-umn becomes debonded from the panel,resulting in the fibre column failing to provide good support and affecting the mechanical properties of the material.