A Heterostructure Simulation Method Based on Abaqus

Abstract

The invention provides a heterostructure simulation method based on ABAQUS. The heterostructure simulation method comprises the following steps: establishing a 2D representative volume unit of a uniform structure and a heterostructure; correcting the sliding resistance model and the back stress model and writing the sliding resistance model and the back stress model into a user subprogram UMAT soas to define an elastic-plastic constitutive equation of the crystal; determining material parameters in the UMAT by utilizing the stretching curves of the three different structures; applying a periodic boundary condition and an external load, and calculating a stress-strain response of each crystal grain by utilizing ABAQUS; averaging stress and strain of all crystal grains; changing parameterssuch as microstructure and grain orientation of the model, predicting and analyzing corresponding macroscopic stress-strain response, strengthening effect and microcosmic deformation cloud atlas, andcomparing to obtain the optimal microstructure. According to the heterostructure simulation method, the grain size effect and extra back stress strengthening of the heterostructure are considered, theheterostructure can be simulated, and the heterostructure simulation method has the advantages of being visual, high in applicability and high in accuracy.

Description

technical field [0001] The invention belongs to the field of finite element numerical calculation of mechanical properties of materials, and relates to an ABAQUS-based heterogeneous structure simulation method. Background technique [0002] With the rapid development of my country's aerospace field, we put forward higher requirements for the comprehensive performance of materials. Although most metallic nano- and ultrafine-grained materials can meet the strength requirements, their low ductility limits their applications in many advanced technologies. In recent years, metal heterostructure materials with good comprehensive properties of strength and toughness at ambient temperature and superplasticity at high temperature have been reported. The unique combination of high strength and good ductility makes heterostructure metals a "dream" for structure and function. engineering materials” and applied in transportation, medicine, energy and other fields. [0003] In order to ...

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Problems solved by technology

[0004] However, in order to consider the internal physical mechanism existing in the deformation process of heterostructures, the traditional slip resistance model and back stress model that do not consider the grain size can no longer meet the requirements. Among them, the existing slip model cannot consider cross-scale grains , the back stress model cannot take into account the special strengthening of heterostructures

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