Low-velocity impact response and damage simulation of fiber/magnesium alloy composite laminates

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (22) : 1-9.

ZHOU Xia,LI Kai,CHEN Chenghang,CHEN Xingchi

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Abstract

In order to investigate the low-velocity impact response of novel fiber reinforced magnesium alloy laminates, the numerical simulations of low velocity drop weight impact tests on AZ31B magnesium alloy laminates reinforced with glass fiber, carbon fiber and their hybrids under different impact energies were conducted.The magnesium alloy, the interfacial delamination between two neighboring layers and the fiber/epoxy composites in the fiber/AZ31B Mg laminates were modeled by using an anisotropic plastic constitutive model, an exponential cohesive zone model, and 3D Hashin failure criteria incorporated with the stiffness reduction of failed elements respectively.In addition, the numerical analyses on the low-velocity impact of different fiber/Mg laminates were carried out by using ABAQUS/Explicit with a user-defined subroutine VUMAT to predict the dynamic impact response, delamination as well as damage evolution under different impact energies.Meantime, the variations of impact force, deformation and energy absorption with time were also analyzed.The results show that the matrix cracking first occurs at the backside, while the matrix cracking and fiber breakage could also appear at the impact side with the increasing of impact energy.Compared with a single carbon fiber reinforced epoxy composite/magnesium alloy laminate, a single glass fiber reinforced epoxy composite/magnesium alloy/laminate can absorb more energy under impact load.Hybrid carbon fiber and glass fiber composite laminates can provide the best impact-resistant properties when the glass layers are at the down layer.

Key words

Fiber magnesium hybrid laminates / low velocity impact / delamination / damage evolution / VUMAT

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ZHOU Xia,LI Kai,CHEN Chenghang,CHEN Xingchi. Low-velocity impact response and damage simulation of fiber/magnesium alloy composite laminates[J]. Journal of Vibration and Shock, 2018, 37(22): 1-9

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