静、动态压缩下环氧树脂玻璃钢的力学行为和特性

To study the mechanical properties of glass fiber reinforced plastic composites under static and dynamic loading, compression experiments were conducted in two directions using a materials testing system (MTS) and a split Hopkinson pressure bar (SHPB). The typical damage pattern of the composites was obtained by scanning electron microscopy (SEM). The results show that the material has strong strain rate sensitivity and anisotropy. Delamination damage and interlaminar crush are the factors that caused the in-plane and out-of-plane loading damage, respectively. The microscopic analysis of the fracture shows that the degree of fiber-matrix fragmentation is higher under dynamic loading. The force between the fiber-matrix interface is stronger, which may be one reason for the difference in the dynamic and static mechanical response of the material. A compressive constitutive model with strain-rate and damage effects was developed to accurately describe the dynamic compressive stress-strain behaviors of the composite along the two perpendicular directions.