Finite Element Method for Predicting Progressive Failure of Composite Multilayer Thick Plates Under Low Velocity Impact

Abstract

The invention relates to composite material multilayer thick plate damage prediction technology and aims at providing a low-velocity impact composite material multilayer thick plate progressive failure prediction finite element method. The low-velocity impact composite material multilayer thick plate progressive failure prediction finite element method comprises the following steps of establishing a low-velocity impact finite element model comprising an impact hammer, a composite material multilayer thick plate and a support plate; establishing a composite material multilayer thick plate multi-scale model; through an ABAQUS-VUMAT, namely an ABAQUS user dynamic material subroutine module encoded through a FORTRAN (formula translator) language, based on the multi-scale model, solving stress, strain and damage low-velocity impact load; performing computation on low-velocity impact to further obtain impact force, displacement, speed and acceleration. According to the low-velocity impact composite material multilayer thick plate progressive failure prediction finite element method, the composite material multilayer thick plate is divided into a small number of sublayer pressing plates, transforming relationships between every sublayer pressing plate and every single layer inside the sublayer pressing plate are established, so that compared with layer-by-layer simulation methods, the l low-velocity impact composite material multilayer thick plate progressive failure prediction finite element method can reduce the computational time of the composite material multilayer thick plate under low-velocity impact and efficiently and relatively accurately predict the progressive failure behaviors of the composite material multilayer thick plate under the low-velocity impact load.

Description

technical field [0001] The invention relates to the field of damage prediction of composite material multilayer thick plates, in particular to a finite element method for predicting progressive failure of composite material multilayer thick plates under low-speed impact. Background technique [0002] At present, composite multilayer thick plates are 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 multi-layer thick plates. Therefore, it is necessary to clearly understand the progressive damage evolution process of composite multi-layer thick plates under low-velocity impact. [0003] The existing low-velocity impact studies of composite multilayer thick plates at home and abroad are all based on two-dimensional flat plate theory and three-dimensional layer-by-layer simulation methods. The in-plane span...

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Problems solved by technology

[0004] The strength calculation and analysis of composite laminates can generally be carried out with the general-purpose finite element software ABAQUS, but the module that comes with the ABAQUS software can only use the layer-by-layer simulation method based on the two-dimensional HASHIN failure criterion to perform low-velocity impact on composite multi-layer thick plates. However, it is impossible to directly use the more advantageous three-dimensional PUCK failure criterion, and it is impossible to directly use the multi-scale model to predict the progressive failure of composite multi-layer thick plates under low-velocity impact.

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