Method for predicting burst pressure of fully fiber wound composite material gas cylinder

Abstract

The invention relates to manufacturing technology of high pressure hydrogen storage cylinders, and provides a method for predicting a burst pressure of a fully fiber wound composite material gas cylinder. The method comprises the following process: establishing a finite element model of the fully fiber wound composite material gas cylinder containing a seal head with variable thickness and variable angle; establishing a multi-scale model of the composite material based on the micromechanics; and performing progressive failure analysis on the composite material gas cylinder based on the multi-scale model by using an ABAQUS-UMAT, namely ABAQUS user static material subroutine module that is complied by the FORTRAN language, and figuring out the burst pressure. According to the method provided by the invention, the damage of the fibers and the matrix components are judged from the micro perspective, and the damage variables are calculated, compared with the traditional phenomenological macro failure criteria, the method has the advantages that the failure mode of the composite material can be determined more accurately, the material parameter to be determined are less, and thus the progressive failure analysis can be carried out on the fully fiber wound composite material gas cylinder efficiently and accurately to obtain the burst pressure.

Description

technical field [0001] The invention relates to the technical field of manufacturing high-pressure hydrogen storage cylinders, in particular to a method for predicting the burst pressure of gas cylinders made of fiber fully wound composite materials. Background technique [0002] At present, fiber fully wound composite gas cylinders are widely used in high-tech fields such as aerospace, pressure vessels, and new energy vehicles. The determination of the burst pressure of composite gas cylinders is the most important aspect of gas cylinders, and is directly related to the optimal design of composite gas cylinders. However, the burst pressure of existing composite gas cylinders is mainly determined through experiments, which is expensive And inefficient. [0003] With the development of finite element technology, the use of finite element methods to predict the burst pressure of composite gas cylinders is gradually rising, but composite gas cylinders have complex failure mode...

AI Technical Summary

Problems solved by technology

[0005] The calculation and analysis of composite materials and composite gas cylinders can generally be carried out by the general-purpose finite element software ABAQUS, but the modules that come with ABAQUS software can only analyze the progressive failure of composite gas cylinders based on the two-dimensional Hashin phenomenological macro-failure criterion. The burst pressure of fiber fully wound composite gas cylinders cannot be directly predicted by the macro-micro multi-scale model

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