点阵增强夹芯结构吸声复合材料制备及性能研究

Fabrication and Properties of Sandwich Structure Acoustic Absorption Composite Materials

采用连续纤维增强吸声芯层,并利用真空辅助成型工艺整体成型了结构吸声复合材料。采用QT/25试验机测试了结构吸声复合材料的抗平压性能、弯曲刚度;采用脉冲声管测试系统测定了结构吸声复合材料水下吸声性能。试验结果表明,吸声芯层、复合材料面板与增强结构三者复合良好、无缺陷,验证了连续纤维增强吸声芯层以及真空辅助成型工艺整体成型结构吸声复合材料技术可行性。与同类型材料相比,含点阵增强结构的材料的平压性能提高了一个数量级,弯曲刚度提高了一倍,声学性能无明显变化。

The sandwich structure acoustic absorption composite materials which reinforced by continuous fiber was fabricated by vacuum assisted resin injection( VARI). The mechanical behavior of the sandwich structure composites reinforced in axial orientation is evaluated under axial compression and bend loads. The underwater acoustic absorption behavior is tested by acoustic impulse tube test system. The results indicated that the absorption core layer,composite panels and the lattice structure formed a whole structure and the fabrication method is feasible. Compared with materials of the same kind,the axial compression and the bending rigidity of the grooved perforation sandwich structure,is improved by an order of magnitude and doubled,respectively,while the acoustic property has no obvious change.