Abstract:

In order to study the influence of strain rate effect on the simulation precision of fiber reinforced composites, the Dynamic Enhancement Factor (DIF) is introduced to modify the modulus and strength of the composite. The modified Hashin failure criterion is used to establish a three-dimensional progressive damage constitutive model of composite materials, which considers the strain rate effect. The model is embedded into the Abaqus software by VUMAT subroutine, and the simulation of the projectile penetrating the fiberglass reinforced composite laminates is carried out. The simulation results are compared with the experimental results and the simulation results of the constitutive model without considering the strain rate effect. The results show that the constitutive model considering the strain rate effect can accurately simulate the process of projectile penetrating the laminate. Compared with the simulation results without strain rate effect, the accuracy is increased by 14.1% and 22.7% respectively by the proposed model, at the penetration speed of projectile at 1.8 m/s and 3 m/s. In the simulation of the constitutive model without considering the strain rate effect, the error increases from 28.7% to 36.9% as the penetration speed increases from 1.8 m/s to 3 m/s, however, the simulation error of constitutive model considering strain rate effect is relatively stable.

Key words: compound material, strain rate effect, constitutive model, user material subroutine, simulation accuracy