Method for analyzing microscomic mechanical damage evolution of fan blade composite material

Abstract

The invention discloses a method for analyzing microscomic mechanical damage evolution of a fan blade composite material. Parametric modeling of the RVE structure model of the representative volume unit is achieved, the accuracy of damage initiation and crack generation of the described composite material component phase and the accuracy of the expansion evolution process are ensured, and for theboundary condition of the RVE model, an Abaqus-Python interface is utilized, periodic boundary conditions of the RVE model are quickly and smoothly applied, and a reasonable microscopic field quantityis obtained; according to the invention, isotropic damage of the matrix is considered; a single damage variable influencing the material rigidity is used; an interface phase is introduced into microscopic damage analysis of a composite material, a damage model is compiled into a UMAT material subprogram in combination with a subprogram interface of Abaqus finite element software, and simulation verification is carried out on the damage process of the blade material under the transverse stretching effect in Abaqus / Standard. The trend and expansion condition of microscopical volume unit interface cracks under the action of transverse tensile load and the influence of periodic temperature on the mechanical response are simulated.

Description

technical field [0001] The invention relates to an analysis method, in particular to a method for analyzing the meso-mechanical damage evolution of a fan blade composite material. Background technique [0002] Fan blade composites are subjected to multiple loads for a long time, and different forms of damage will inevitably occur inside them, such as micro-scale cracking in local areas of the matrix, interfacial debonding at the connection between fibers and matrix, and component phase. long-term interactions, etc. The occurrence of blade damage will have a certain impact on the original strength and stiffness of the composite material, and it is also an important factor affecting the service life of the blade in engineering applications. [0003] 1. Introduction to wind turbine blade damage research [0004] The blade is the component of the wind turbine that directly receives wind energy resources. It is the source component of the wind turbine to generate electricity. I...

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Problems solved by technology

However, for the current modeling technology, the model still has certain problems when combined with discrete numerical models to analyze the mesostructure of real composite materials and when discontinuities occur.

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