Method for establishing constitutive model for aluminum alloy thermal elastoplastic deformation simulation

Abstract

The invention discloses a method for establishing a constitutive model for aluminum alloy thermal elastoplastic deformation simulation. The method comprises the following steps: (1) selecting the constitutive model; (2) determining model parameters; and (3) substituting the parameters into a constitutive model equation, and determining the constitutive model equation. The method has the advantages that the establishment of the constitutive model fills up the blank of simulating a relationship between the mechanical performance and temperature of a material used in machining of a 7A52 aluminum alloy heat machine with a numerical simulation method all the time, improves the accuracy of 7A52 aluminum alloy thermal elastoplastic deformation simulation, lays an important basis for confirming a 7A52 aluminum alloy hot working process and studying a metal plastic deformation theory, and has an important significance for practical application of 7A52 aluminum alloy.

Description

Technical field: [0001] The invention relates to the technical field of material analysis, in particular to a method for establishing a constitutive model for simulating thermal elastic-plastic deformation of aluminum alloys. Background technique: [0002] 7A52 aluminum alloy is an AI-Zn-Mg-Cu aluminum alloy developed by my country. Because of its small specific gravity, high strength and weldability, it is widely used in aerospace, aviation, nuclear energy, chemical containers and military industries. and other fields. However, in the actual engineering application of 7A52 aluminum alloy, such as machining, rapid forging, heat treatment and ultrasonic impact treatment for surface hardening after welding, the material will be greatly deformed, and the deformation rate can reach 10 4 the s -1 Above, the temperature can sometimes reach the order of 500°C. Therefore, it is of great significance to study the mechanical behavior of 7A52 aluminum alloy under different loading con...

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Problems solved by technology

In fact, the stress of many materials varies greatly in different temperature, strain and strain rate ranges. The flow stress-strain relationship obtained by interpolation and extrapolation seriously affects the accuracy of finite element calculations and is used to determine the data of a flow stress curve. If there are very few points, the results of numerical simulation and experimental results will differ greatly. With the increase of deformation, the error of flow stress will gradually increase. Especially in the process of ultrasonic impact, the material will produce large plastic deformation. Using an inaccurate material model can affect the numerical accuracy of the entire model

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