Microcosmic simulated analysis method for ultrasound attenuation coefficient of composite material with holes

Abstract

The invention provides a microcosmic simulated analysis method for an ultrasound attenuation coefficient of a composite material with holes. The method includes a first step of inputting modeling parameters to DIGIMAT software according to hole features of the composite material and building a microcosmic geometric model, a second step of introducing the microcosmic geometric model in the step a to ABAQUS software, conducting constraint on the composite material, dividing the composite material to form meshes and building a finite element model, a third step of exerting ultrasonic wave stimulation on the composite material in a simulated mode, a fourth step of storing model data and conducing ultrasound attenuation simulation calculation, and a fifth step of extracting a pressure intensity field distribution cloud picture, conducting result representation on the ultrasound attenuation of the corresponding model under the condition that the hole features exist and obtaining the ultrasound attenuation coefficient by conducting calculation on ultrasonic wave sound pressure distribution in different positions. The microcosmic simulated analysis method for the ultrasound attenuation coefficient of the composite material with holes can reflect a real microstructure and microcosmic material attributes of the composite material, can obtain a quantitative relation between the ultrasound attenuation coefficient and a pore rate, and provides an important theoretical basis and a technological base for nondestructive testing of the hole rate of the composite material.

Description

technical field [0001] The invention relates to a finite element simulation analysis method, in particular to the application of the mesomechanics-based finite element simulation analysis method in non-destructive testing of composite materials containing pores. Background technique [0002] For composite structural parts related to flight safety, non-destructive testing must be carried out for defects and damage caused by the process, and the acceptance / rejection criteria for these defects will be given in the manufacturer's process specifications. Among them, the use of ultrasonic non-destructive testing technology to detect and evaluate the pores and porosity inside composite parts is an important technical link in the manufacture of civil aircraft composite structures. [0003] For ultrasonic non-destructive testing of porous composite materials, it has become a development trend to establish an analytical model for the pore characteristics (that is, the distribution, co...

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Problems solved by technology

At present, at home and abroad, the micro-scale symmetry and periodicity of composite materials are used to establish an appropriate representative volume element (Representative volume element, RVE) according to its mesoscopic geometric structure, and analyze and calculate it to obtain the macroscopic properties of composite materials. The mesoscopic analysis method has been widely used, but due to the randomness of the size and distribution of the pores, the traditional finite element simulation cannot accurately establish the model of the composite material with pores, so for the composite material with pores from the fine There are relatively few studies on the analysis of the response of ultrasonic waves as external loads.

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