三维夹芯复合材料低速冲击性能有限元法研究

Finite Element Analysis on Low-velocity Impact Characteristics of 3D Sandwich Composites

借助有限元软件ANSYS建立了三维夹芯复合材料细观结构模型,重点研究了在低速冲击载荷作用下材料、纤维和树脂的应力、应变分布,并分析了树脂种类对材料抗低速冲击性能的影响。结果表明,在低速冲击载荷下,从宏观角度来看,冲击点处、芯材圆弧中心处应力较大,最易发生破坏,而下面板边缘处应力最小,不易被损坏;从细观角度来看,纤维是承载的主体,树脂起次要作用;环氧树脂基复合材料抗低速冲击性能更优。

The mesoscopic structure model of three-dimensional sandwich composites was established by using finite element software ANSYS.Using this model,the stress and strain distribution of materials,fibers and resins under low-velocity impact load are studied,and the influence of resin type on the low-velocity impact resistance of the material is analyzed.Results indicated that under the low-velocity impact load,from the macroscopic point of view,the stress at the impact point and the center of the core arc is greater,and it is most vulnerable to damage,while the stress at the edge of the lower panel is minimal,and not easy to be damaged;from the meso point of view,the fiber is the main body of the bearing,and the resin plays a secondary role;the low-velocity impact resistance of epoxy resin matrix composites is better than that of unsaturated resin matrix composites.