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考虑到点阵芯层的结构形式及杆单元以拉压为主的变形模式,基于连续介质等效理论,提出了一种全新的位移场假设,并以此编写了计算点阵夹芯复合材料屈曲强度的有限元程序.通过与不同试样的压缩试验的比较,对碳纤维增强点阵夹芯结构的屈曲行为进行了分析,并且验证了程序的有效性.同时,采用程序,讨论了点阵参数(包括杆单元长度、半径及倾斜角)对点阵夹芯复合材料结构屈曲强度的影响规律.结果表明:芯层体积分数相同的情况下,金字塔型和四面体型点阵夹芯结构的屈曲强度相差不大,后者略高.所得结论对点阵夹芯复合材料结构设计具有一定的指导意义.
Considering the structure of the lattice and the deformation mode of the rod based on tension and compression, a new displacement field hypothesis is proposed based on the continuum theory. Based on this, a new method of calculating lattice sandwich composites Buckling strength finite element program.Compared with the compression tests of different samples, the buckling behavior of carbon fiber reinforced lattice sandwich structure was analyzed and the validity of the program was verified.At the same time, using the program to discuss the lattice (Including the length, radius and tilt angle of rod element) on the buckling strength of lattice sandwich composites were studied.The results show that the buckling of pyramid and tetrahedral lattice sandwich structures with the same core volume fraction The strength of the difference is not big, the latter is slightly higher.The conclusions obtained for the lattice sandwich composite structure design has a certain significance.