A Finite Element Method for Predicting Progressive Failure of Composite Laminates Under Low Velocity Impact

Abstract

The invention relates to damage prediction for composite materials and is aimed at providing a finite element method for predicting progressive failure of composite laminates under low-speed impact. The method comprises following processes: a low-speed impact finite element model containing a hammer, composite laminates and support plates is established; a composite material elastoplasticity damage constitutive model is established; the elastoplasticity damage constitutive model is realized on the basis of ABAQUS-VUMAT user dynamic material subprogram module and by means of the backward Euler algorithm; the low-speed impact is calculated to further obtain impact force, displacement, speed and acceleration. According to the method, the ABAQUS-VUMAT user subprogram is adopted to numerically realize the elastoplasticity damage constitutive model combining plasticity and damage, wherein the model simultaneously considers the influence of plasticity and material performance degeneration; the method can accurately predict progressive damage failure of composite materials having plasticity characteristics under low-speed impact.

Description

technical field [0001] The invention relates to the field of composite material damage prediction, in particular to a finite element method for predicting progressive failure of composite material laminates under low-velocity impact. Background technique [0002] At present, composite materials are being widely used in high-tech fields such as aerospace, wind power generation, pressure vessels, and automobiles. However, low-velocity impact damage has a great influence on the strength, stiffness and service life of composite materials, so it is necessary to clearly understand the progressive damage evolution process of composite materials under low-velocity impact. [0003] Some composite materials, such as T300 / 914, AS4 / PEEK, etc., have significant nonlinearity and plasticity under transverse and shear loading. The irreversible deformation of composite materials is caused by various failure mechanisms, such as damage to the fiber matrix, Fiber / matrix interface separation, p...

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Problems solved by technology

[0003] Some composite materials, such as T300 / 914, AS4 / PEEK, etc., have significant nonlinearity and plasticity under transverse and shear loading. The irreversible deformation of composite materials is caused by various failure mechanisms, such as damage to the fiber matrix, Fiber / matrix interface separation, plastic deformation accumulation, etc. At this time, the elastic damage constitutive model is not accurate in predicting the low-speed impact response of this type of composite material. Therefore, a low-speed impact response of composite laminates with plastic behavior is proposed. The elastic-plastic damage constitutive model of impact response is especially necessary

In recent years, the elastoplastic damage constitutive model proposed for composite laminates fails to reasonably consider the influence of out-of-plane stress and the appropriate failure criteria and damage evolution, and basically focuses on the static damage research of composite materials, while the elastoplastic damage constitutive model Structural models are used to accurately predict the damage of composite laminates under low-velocity impact.

[0004] ABAQUS software can study the gradual failure of elastic composite materials under low-velocity impact based on the two-dimensional HASHIN failure criterion, but it cannot directly use the more advantageous PUCK failure criterion, and it cannot directly perform low-velocity impact on composite laminates with plastic characteristics. Research

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