A Method for Establishing a Constitutive Relation Model of Magnesium Alloy Materials

Abstract

The invention discloses a magnesium alloy material constitutive relation model establishing method. According to the method, a simplified Arrhennius equation is adopted to divide a deformation temperature into 2-4 temperature intervals according to a change rule, along with the temperature, of deformation activation energy, so as to respectively solve deformation constitutive equations of the temperature intervals. The method is characterized by comprising the following steps of: (1) simplifying the Arrhennius equation; (2) solving a Q value of the deformation activation energy and analyzing the change rule, along with the temperature, of the deformation activation energy; and (3) dividing the deformation temperature into 2-4 temperature intervals according to the change rule, along with the temperature, of the deformation activation energy, and respectively establishing the constitutive equations of the temperature intervals by adoption of the simplified Arrhennius equation. According to the method, the relatively big error caused by using an average value of the deformation activation energy under all the temperatures as material deformation activation energy to carry out solution in the traditional method can be effectively avoided. A magnesium alloy material constitutive model established according to the method has relatively high precision.

Description

technical field [0001] The invention belongs to a method for establishing constitutive models of plastic deformation of magnesium alloy materials, and is applicable to the establishment of constitutive models of plastic deformation of magnesium alloys of different grades. Background technique [0002] The constitutive model of materials is an important basic theory for numerical simulation of plastic deformation, and an important reference element for the formulation of process regulations. Since the dynamic response of the material during the plastic processing deformation process is the result of the combined hardening and softening caused by the internal structure evolution process of the material, its constitutive relationship is highly nonlinear. At present, the general practice is to establish the constitutive relationship by fitting the experimental data of deformation under constant conditions through mathematical processing methods based on the Arrhenius equation. ...

AI Technical Summary

Problems solved by technology

The constitutive models used to characterize the uniaxial tensile and compressive deformations of magnesium alloys have been established under different deformation conditions. The low prediction accuracy is a common problem in these models, but no effective solutions have been proposed yet.

The patent of this invention aims at the technical problem of low prediction accuracy of existing constitutive models of magnesium alloys, and proposes a method for establishing a constitutive relationship model of magnesium alloy materials with high prediction accuracy

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