Method for obtaining yield criterion of polycrystalline metal material

A technology of metal materials and acquisition methods, applied in the field of materials, can solve the problems of low calculation efficiency, large calculation amount, difficult to popularize and apply, etc., and achieve the effect of reducing calculation amount and strong practicability

Active Publication Date: 2020-09-18
JIHUA LAB
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since it is necessary to fully understand the behavior of microstructure changes during deformation of polycrystals and to fully consider the activation conditions of all possible deformation mechanisms in polycrystals, a yield criterion with suffic

Method used

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  • Method for obtaining yield criterion of polycrystalline metal material
  • Method for obtaining yield criterion of polycrystalline metal material
  • Method for obtaining yield criterion of polycrystalline metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] In this embodiment, a rolled AZ31 magnesium alloy plate is used as the test object.

[0073] In step S1, during the mechanical performance test, tension and pressure are applied to the rolling direction (RD direction, equivalent to the length direction), tension and pressure are applied to the width direction (TD direction), and the inner surface of the plate is Tension and pressure are applied in the direction of 45° (that is, the direction that forms an angle of 45° with the length direction in the plate surface), and pressure is applied in the direction of its thickness (ND direction). The true stress-strain curves obtained in each direction are as follows: image 3 shown;

[0074] image 3 Among them, RD-C is the compressive true stress-strain curve in the rolling direction, TD-C is the compressive true stress-strain curve in the width direction, 45-C is the compressive true stress-strain curve in the direction of 45° in the plate surface, and ND-C is The compress...

Embodiment 2

[0079] In this embodiment, the AZ31+0.2Ca magnesium alloy extruded plate is used as the test object. Compared with the plate in Example 1, the texture is weaker, the yield strength is lower, but the plasticity is better. The test flow and data processing flow are the same as those in Embodiment 1.

[0080] The obtained true stress-strain curves in each direction are as follows: Figure 6 As shown in the figure, ED-C is the compressive true stress-strain curve in the extrusion direction (equivalent to the length direction), TD-C is the compressive true stress-strain curve in the width direction, and ED-T is the tensile true stress-strain curve in the extrusion direction. Stress-strain curve, TD-T is the tensile true stress-strain curve in the width direction, VPSC is the VPSC simulation fitting result used to obtain the critical shear force parameters of the deformation mechanism.

[0081] The measured texture orientation was as Figure 5 shown.

[0082] The yield traces of ...

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Abstract

The invention provides a method for obtaining a yield criterion of a polycrystalline metal material, comprising the following steps of: S1, obtaining tensile and compressive mechanical property curvesof a polycrystalline material; S2, measuring texture orientation distribution data of the polycrystalline material, and carrying out block component processing on the orientation distribution data; S3, calculating to obtain critical shearing force required by activation of initial yield of various deformation mechanisms of the polycrystal according to the obtained mechanical property curve and texture orientation distribution data; S4, specifying a specific loading condition, and calculating the yield strength of each texture component under the condition of considering the intercrystalline deformation coordination effect; S5, calculating the equivalent yield strength under the specified loading condition; and S6, circularly executing the steps S4 and S5 until all loading conditions are traversed to obtain the equivalent yield strength of the polycrystalline material under all loading conditions and obtain the yield criterion of the polycrystalline material. The method has advantagesof high accuracy of the yield criterion, small calculated amount and strong practicability.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for obtaining yield criteria of polycrystalline metal materials. Background technique [0002] The yield criterion is mainly used to predict the yield strength of the metal material under different loading conditions. Usually, the yield criterion of the metal material is referred to when formulating the design safety work standard of the metal material under the duplication condition, so the accuracy of the yield criterion is very important . [0003] The traditional yield criterion is mainly based on the mechanical properties of traditional materials such as steel and aluminum alloys, and is established by fitting test results with phenomenological methods. Most of these materials have isotropic characteristics, that is, to measure the yield strength of materials under one condition, It can be used as the equivalent yield strength under other conditions; this yield c...

Claims

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Application Information

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IPC IPC(8): G16C60/00
CPCG16C60/00
Inventor 夏大彪刘伟徐龙赵聪聪冯上样
Owner JIHUA LAB
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