Method for establishing and analyzing three-dimensional fracture model of polyethylene under complex stress

Abstract

The invention relates to the field of laboratory material failure analysis and finite element simulation, in particular to a method for establishing and analyzing a three-dimensional fracture model ofpolyethylene under complex stress. The method comprises the following steps: carrying out a uniaxial tensile experiment on the same polyethylene material to obtain an engineering stress displacementexperiment curve; establishing a finite element model, selecting a damage model, and modifying damage model parameters until an engineering stress displacement curve obtained by a uniaxial tensile experiment can be simulated and reproduced, so as to obtain a real stress-strain curve of a tensile sample; and applying the real stress-strain curve to subsequent finite element simulation, and establishing a three-dimensional fracture model of the polyethylene material in a complex stress state by utilizing finite element analysis. The problem that failure analysis methods under complex stress in the prior art are all designed by metal materials and are not suitable for polyethylene materials is solved.

Description

technical field [0001] The invention relates to the field of laboratory material failure analysis and finite element simulation, in particular to a method for establishing and analyzing a three-dimensional fracture model of polyethylene under complex stress. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Polyethylene is a high molecular polymer material, which has the advantages of wear resistance, corrosion resistance, impact resistance, chemical resistance, etc., and is widely used in the pipeline manufacturing industry such as gas pipes and water pipes. In the gas pipe manufacturing industry, polyethylene pipes have become the main pipe type in recent years, especially in the medium and low pressure gas pipeline network. Polyethylene pipes are the main or even the only choice for newly laid pipes and old pipes for repair and renewal. During ...

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Problems solved by technology

[0005] The analysis methods for failure under complex stress described in the prior art are all designed for metal materials, which are not suitable for polyethylene materials

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