Method for synchronously characterizing anisotropic yield and hardening constitutive parameters of metal material

An anisotropic, metal material technology, applied in analyzing materials, testing material strength by applying repetitive force/pulse force, and testing material strength by applying stable tension/pressure, etc., can solve problems such as poor practicability and achieve practicality Good, parameters characterize the effect of reducing the amount of calculation and calculation time, simplifying the experimental equipment and experimental process

Active Publication Date: 2019-09-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings of poor practicability of the existing constitutive parameter characterization methods for metallic material

Method used

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  • Method for synchronously characterizing anisotropic yield and hardening constitutive parameters of metal material
  • Method for synchronously characterizing anisotropic yield and hardening constitutive parameters of metal material
  • Method for synchronously characterizing anisotropic yield and hardening constitutive parameters of metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: use finite element software to construct the test piece configuration, set the material constitutive model and model parameters, simulate the test piece uniaxial tension and cyclic tension-compression experiments, derive the simulated data of strain and load, and simulate Data Substitution written by The parameter characterization program identifies the constitutive parameters of the material based on the simulated data, and compares the characterization results with the input model parameters to verify the accuracy of the method.

[0030] Step 1. In the finite element software Build the test piece model. In order to keep the external deformation of the specimen at a lower level under a certain compressive load, by adjusting the configuration of the specimen, part of the material on the rectangular specimen is removed, so that part of the compressive load can be transformed into shear deformation, and at the same time, the deformation of the specimen can...

Embodiment 2

[0068] Example 2: Experimental method for characterization of anisotropic yield and plastic hardening parameters of metal materials. The selected material is AZ31B magnesium alloy. The difference between this embodiment and Embodiment 1 is that the deformation field of the magnesium alloy specimen is measured by the digital image correlation full-field deformation measurement system, the load value is measured by the testing machine system, and other steps, such as specimen configuration, loading process, and data substitution , virtual field selection, program operation, etc. are the same as those in Embodiment 1.

[0069] This method can also be applied to the characterization of anisotropic constitutive parameters of aluminum alloys, advanced high-strength steels, and other metal materials. The applicability of different models varies according to different materials. modification, and then adopt the characterization method proposed by the present invention to characterize...

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Abstract

The invention discloses a method for synchronously characterizing anisotropic yield and hardening constitutive parameters of a metal material, which is used for solving the technical problem of poor practicability of the conventional method for characterizing the parameters of the metal material. The technical scheme is that a proper test piece configuration is designed, so that the test piece can simultaneously generate rich positive strain and shear strain under the action of simple tensile or compressive load, and the out-of-plane deformation of the test piece is at a lower level within a certain compressive strain range, thereby achieving the simultaneous characterization of anisotropic yield and anisotropic plastic hardening constitutive parameters of numerous metal materials by utilizing a virtual field method only by combining primary cyclic tensile-compression experiment and primary unidirectional tensile experiment. Compared with the anisotropic parameter characterization method in the prior art, the method can be completed on one single-axis testing machine without a biaxial stretching machine, a hydraulic expansion testing machine, a shearing experimental device and the like, and experimental equipment and an experimental process are simplified, and the practicability is good.

Description

technical field [0001] The invention relates to a characterization method for constitutive parameters of metal materials, in particular to a simultaneous characterization method for anisotropic yield and hardening constitutive parameters of metal materials. Background technique [0002] Advanced high-strength steels, aluminum alloys, magnesium alloys and other advanced metal materials are widely used in automotive, aviation, aerospace, weapons and other industrial fields due to their excellent mechanical and physical properties. When plastic forming is used to produce these metal parts, especially the rolled sheet type parts used in large quantities, it is often difficult to accurately control the part configuration and size, because these materials will show significant spring back when unloaded. It is well known that the springback of deformed metallic materials is closely related to their anisotropic yielding and anisotropic plastic hardening behaviors (such as Bauschinge...

Claims

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Application Information

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IPC IPC(8): G01N3/32G01N3/08G01N3/06G01N1/28
CPCG01N1/28G01N1/286G01N3/068G01N3/08G01N3/32G01N2203/0005G01N2203/0017G01N2203/0019G01N2203/0647
Inventor 付佳伟齐乐华谢稳伟周计明罗俊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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