Numerical Analysis of Damage Mechanism on Low-velocity Impact of GLARE 5 Fiber-metal Laminates

The impact performance play an important role in marine material. A numerical methodology including user material subroutine VUMAT, Johnson Cook flow stress model and surface based cohesive behavior is carried out to simulate the damage evolution of the impact of GLARE 5 fiber-metal laminates (FML). Specially, user material subroutine VUMAT and surface based cohesive behavior are employed to solve composite and interface delamination in numerical simulation of low-velocity impact on GLARE 5 FML. By parameters study, proper properties of fiber reinforced layers and surface-based cohesive behavior are given. Moreover, the damage progression of fiber reinforced layers, aluminum alloy layers and delamination in FML are analyzed, respectively. The low-velocity damage mechanism of GLARE 5 is investigated by combining histories of absorbed energy, deflection, contact force and damage evolution. After comparing and analyzing three kinds of damage evolution and the curves of history of absorbing energy, central deflection and contact force, our simulations show that aluminum alloy layers play an important role in improving the performance of low-velocity impact for composites material.