碳纤维增强金字塔点阵夹芯结构的抗压缩性能

Compressive behavior of sandwich structures with carbon fiber reinforced pyramidal lattice truss cores

提出了一种碳纤维增强复合材料点阵夹芯结构的一体化成型工艺方法。该方法克服了传统夹芯结构面板与芯子之间因需要二次粘接或焊接的方法所带来弱界面的缺点。将纤维杆两端埋入面板内,使面板与芯子成为一体而不存在明显的界面。对用该方法制备的碳纤维增强金字塔点阵夹芯板进行平压试验,研究发现随着载荷的增加,纤维杆发生弹性屈曲并在中间部位出现断裂。理论分析了点阵夹芯结构平压载荷下的弹性模量和纤维杆极限屈曲载荷。通过与传统夹芯材料相比较发现,这种新型复合材料点阵夹芯结构具有密度低、比强度和比刚度高等优点。

A new fabrication technology of carbon fiber reinforced pyramidal lattice truss core sandwich structures was presented.It dealt with the disadvantage of such traditional technology as the facesheets and core needing bonded or joined additionally.Both ends of truss members were embedded into the facesheets without evident interface between the core and facesheets.The pyramidal lattice truss core sandwich structures were tested under compressive load.Observation of the buckling and splitting of truss members was done during the tests.And the compressive stiffness and the limit buckling load of the lattice truss core sandwich structures were calculated theoretically.Compared with the traditional sandwich structures,the pyramidal lattice truss core sandwich structures have the advantages of lower density,higher specific stiffness and higher specific strength.