A Numerical Simulation Method for Low Velocity Impact Damage of Composite Laminates

Abstract

The invention belongs to the field of static damage to aeronautical composite materials, and particularly relates to a method for numerically simulating low-speed impact damage to a laminated board made of composite materials. The method includes steps of creating single-layer models of the laminated board; creating interlayer models of the laminated board; creating a resin crack model of the laminated board; creating an impact head model, combining the single-layer models, the interlayer models, the resin crack model and the impact head model with one another to form an impact model of the laminated board; solving the impact model of the laminated board. The method has the advantages that a quasi-static load replaces a complicated dynamic impact load, so that the computational scale is reduced, and the computational efficiency is improved; the computational time is shortened owning to an Abaqus / Standard solver; early resin cracks under the low-speed impact load can be effectively simulated, and the delamination damage area and the delamination damage shape can be effectively simulated; interaction among the resin cracks and interlayer delamination can be effectively simulated, and the accurate delamination damage area and the accurate delamination damage shape can be acquired.

Description

Technical field [0001] The invention belongs to the field of static damage of aviation composite materials, and particularly relates to a numerical simulation method for low-speed impact damage of composite material laminates. Background technique [0002] The low-velocity impact damage of composite laminates from foreign objects may cause a series of barely visible damages such as delamination, matrix cracks, fiber breakage and surface damage. The compressive strength of laminates with such damage can be reduced to about 50% of that of non-destructive boards. [0003] There are three main methods for numerical calculation of low-velocity impact damage of composite materials at home and abroad: calculation model based on strength failure, fracture mechanics model and interface element model. The strength failure model cannot well simulate the gradual growth process of delamination and resin cracks, but due to the short duration of impact damage, this simulation method is also wide...

AI Technical Summary

Problems solved by technology

[0005] The interface element model can conveniently simulate the initiation and propagation of delamination and resin cracks, but it cannot simulate the limitation of delamination damage caused by compressive loads in the interface

[0006] Numerical simulation of low-velocity impact damage to composite laminates mostly uses a dynamic load loading model, which is time-consuming and labor-intensive, and the calculation efficiency is low

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