Study on the E-glass fiber 2D reinforced composite constitutive model of damage mechanics based on Hashin criterion

The basic mechanical properties of E-glass fiber reinforced composites were achieved through tensile test to provide reference data for the material model and numerical simulation.Composite elastic constitutive equation was obtained through orthotropic constitutive material by derivation of elasticity and the numerical analysis of stiffness matrix in constitutive.The results were applied to Hashin strength criterion,establishing a continuum damage mechanics based orthotropic damage constitutive model.Created flexibility and damage constitutive model given three-dimensional laminates,then using the finite element software ABAQUS/explicit simulated the impact of the projectile through the GFRP composite laminates to achieve the established model of the application,and the simulation results were analyzed.Laminates internal damage was mainly delamination and matrix cracking and interlaminar delamination damage area much larger than the inner layer.The most important damage mode of each layer damage was matrix cracking damage,followed by fiber fracture injury while the base extrusion and fiber extrusion damaged area was relatively small.When the bending deformation occurred,bottom withstood greater tensile stress.When the evolution of damage extended to a certain extent, matrix cracking and fiber breakage was first produced in the back of GFRP impact.Closer to the damage of the inner surface layer was relatively small.