Simulation method of impact mechanical properties of carbon fiber composites based on multi-scale

Abstract

The invention discloses a method for simulating the impact-resistant mechanical properties of carbon fiber composite materials based on multi-scale, comprising: step 1, performing a CFRP quasi-static test to obtain parameters; step 2, performing drop-weight impact tests under different working conditions to obtain CFRP The dynamic mechanical response and damage form of the CFRP; step 3, establish the CFRP scale model, set the boundary conditions, and analyze the impact of mesoscopic parameters; step 4, calculate the amplification factor, establish the relationship between the mesoscopic and macroscopic, reconstruct the material constitutive, update Macroscopic stiffness matrix; step 5, perform multi-scale simulation of CFRP laminate drop hammer impact, and obtain the influence of mesoscopic parameters and matrix defects on the impact resistance of CFRP. Through simulation experiments, the influence of mesoscopic parameters and matrix defects on the impact resistance of CFRP can be obtained, and the mechanical response and failure process of fibers and collectives of carbon fiber composites can be simulated, and the process of section cracking and collective fiber destruction of carbon fiber composites can be obtained.

Description

technical field [0001] The invention relates to a multiscale-based simulation method for the impact-resistant mechanical performance of carbon fiber composite materials, and belongs to the field of finite element simulation of fiber-reinforced composite materials. Background technique [0002] As the most promising lightweight material at present, CFRP has attracted the attention of automobile manufacturers with its high strength, low material density and strong designability, and has gradually been applied to automobile production. [0003] Impact damage often occurs in the process of driving a car. When a carbon fiber composite material is subjected to a high-energy impact, it will produce depressions and penetration phenomena. When it is subjected to a low-energy impact, the surface damage is not obvious, but the interior of the composite material Phenomena such as fiber breakage, matrix cracking and delamination damage will occur, which will affect the mechanical propert...

AI Technical Summary

Problems solved by technology

Among them, the research on impact composite laminates by macroscale simulation is mainly based on the uniform strength theory in macromechanics. On the one hand, this theory ignores the local stress inhomogeneity and does not distinguish the strength difference between the fiber and the matrix, resulting in low simulation accuracy. High; while the mesoscale simulation has high accuracy, but has the disadvantages of large amount of calculation and relatively high time cost

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