Ballistic Impact Test And Multi-scale Modeling Analysis Of Carbon Fiber 2.5D Woven Composite

As a special form of 3D woven composites,carbon fiber 2.5D woven fabric composite plates is characterized by the interweaving of stitching warp and two layers of weft,and the interweaving between one row of weft yarn and the next layer of weft yarn.This kind of composites overcomes well the defect of poor interlaminar performance of carbon fiber laminates,which makes the composite materials can be more widely used in various fields.Therefore,in this paper,through the combination of experiments and multi-scale simulation modeling,the ballistic impact properties of 2.5D woven composites and its influencing factors were studied.Firstly,the ballistic impact test of carbon fiber 2.5D woven composite plate was carried out by using a gas gun.The ballistic impact performance of carbon fiber 2.5D woven composite was evaluated by the ballistic limit velocity and the total energy absorption of the target plate.The damage morphology and failure mode of carbon fiber 2.5D woven composites were identified by ultrasonic C-scan and industrial CT scan.The ballistic impact characteristics and energy absorption mechanism of carbon fiber 2.5D woven composites were analyzed phenomenologically.The result shows that the ballistic limit velocity of a carbon fiber 2.5D woven composite with a thickness of 5mm is about 130-140m/s.The main failure mode when the target plate penetrates is shear packing damage,and a small amount of fiber is pulled out around the bullet hole.Carbon fiber 2.5D woven composite material has good interlayer performance,and the target plate hardly undergoes delamination.Secondly,the quasi-static tensile,shear and compression tests were performed on the2.5D woven composite plate of carbon fiber formed by Resin Transfer Molding(RTM)to obtain the mechanical properties of the material.Based on the average field homogenization model,a meso-cell finite element model was established to calculate the basic mechanical performance parameters of carbon fiber 2.5D braided materials.The calculation results of the meso-model are compared with the test results to verify the validity of the meso-unit cell finite element model.The ABAQUS commercial finite element software was used to establish a carbon fiber2.5D braided composite material ballistic impact test simulation analysis model.The target plate model adopts a three-dimensional solid element,and the boundary condition is four-end fixed support.Defined using rigid elastomer,elastomer Target perpendicularly incident.An elastic constitutive model of three-dimensional composite materials with damage based on the three-dimensional Hashin failure criterion is established.Use the Fortune compiler to write VUMAT user-defined subroutines,and use the meso-cell finite element model to calculate the material parameters as input.The influence of the inclination angle and shape of the projectile on the ballistic impact results of carbon fiber 2.5D woven composites was studied.The results show that when the inclination angle of the projectile is less than 45°,the ballistic limit of the projectile and the total energy absorption of the target plate increase obviously with the increase of the inclination angle.When the inclination angle of the projectile is greater than45°,no significant change occurs.The aspect ratio of the blade-shaped projectile section is far greater than 1,the material damage is dominated by shear damage,and the ballistic limit velocity is the smallest.