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A Method for Measuring the True Stress of Materials

A technology of real stress and samples, which is applied in the field of material science, can solve the problems of unable to measure and calculate stress, and achieve the effect of strong market promotion value, wide application range and guaranteed accuracy

Active Publication Date: 2020-05-12
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above formulas are not applicable, so it is impossible to measure and calculate the true stress

Method used

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  • A Method for Measuring the True Stress of Materials
  • A Method for Measuring the True Stress of Materials
  • A Method for Measuring the True Stress of Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The following examples are for as-cast Zr 50 Cu 44 al 6 (at.%) round bar shape amorphous alloy sample.

[0056] The measurement cast Zr of present embodiment 50 Cu 44 al 6 (at.%) The method for the true stress of the amorphous alloy comprises the following specific steps:

[0057] (1) Using the dynamic method (acoustic method) to measure the as-cast Zr 50 Cu 44 al 6 Poisson's ratio of amorphous alloy μ=0.37;

[0058] (2) Zr in the shape of a round rod (circular in cross section) 50 Cu 44 al 6 The original length l of the amorphous alloy 0 The sample is 4.20mm and the radius is 1.09mm. The universal force mechanical testing machine is used to uniaxially compress the sample to obtain the load-displacement curve. Combined with the sample size, the engineering stress-strain curve is obtained, and then the formula (1) and ( 2) Calculate the true stress-strain curve according to the traditional method;

[0059] (3) According to the engineering stress-strain curv...

Embodiment 2

[0062] The following examples are for Al heat treated after rolling 0.3 CoCrFeNi (at.%) high entropy alloy, the rolling deformation is 75%, the annealing temperature is 800°C, and the annealing time is 1 hour.

[0063] The measurement Al of this embodiment 0.3 The method for the true stress of CoCrFeNi (at.%) high-entropy alloy comprises the following specific steps:

[0064] (1) Obtain the above-mentioned Al by static method (mechanical method) measurement 0.3 The Poisson's ratio of the CoCrFeNi high-entropy alloy μ=0.30;

[0065] (2) Plate-shaped (square cross-section) Al 0.3 The original length l of CoCrFeNi high-entropy alloy 0 12.70mm, thickness 0.50mm, width 3.2mm, such as Figure 7 Shown; Utilize universal force mechanical testing machine to carry out uniaxial tension to sample, obtain load-displacement curve, calculate engineering stress-strain curve in conjunction with sample size, then utilize described formula (1) and (2) according to traditional method Calcul...

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Abstract

The invention discloses a method for measuring true stress of a material and belongs to the technical field of material science. According to the method disclosed by the invention, a Poisson effect and volume expansion of the material in an elastic deformation region are considered; meanwhile, height localization of deformation of the material in a plastic deformation process is considered, and plastic deformation is finished through formation and sliding of a shear zone. Therefore, in a whole deformation process, an effective loading area can be accurately calculated by combining an originalsize of a sample piece, and the true stress on the sample piece can be accurately measured by utilizing a uniaxial loading load-displacement curve; the method has great significance and value in a process of determining basic mechanical property parameters by utilizing uniaxial loading.

Description

technical field [0001] The invention belongs to the technical field of material science, and more specifically relates to a method for measuring the real stress of a material. Background technique [0002] In order to measure, evaluate and compare the mechanical properties of materials (especially structural materials), the most simple and convenient test methods are uniaxial tension and uniaxial compression, and then calculate the stress according to the load-displacement curve combined with the geometric dimensions of the sample -Strain relationship, so as to obtain four extremely important performance parameters of the material, Young's modulus, yield strength, breaking strength and elongation. In order to reflect the stress state inside the material more accurately, the real stress-strain curve is usually calculated according to the engineering stress-strain curve obtained in the experiment. The calculation formula is derived and explained in relevant textbooks: [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 王建国赵慧李维火
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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