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Method for forecasting uniaxial constitutive relation of material according to press hardness

A technique of indenting hardness and constitutive relationship, which is applied in the direction of testing material hardness, etc., and can solve problems such as difficulty in direct correspondence, low prediction accuracy, and inability to predict uniaxial constitutive relationship

Inactive Publication Date: 2012-07-18
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

For spherical indentation, it is difficult to find the direct correspondence between indentation load P, depth h and tensile stress and strain, and the prediction accuracy is low. Only the elastic modulus value of the material can be obtained, and the uniaxial property of the material cannot be predicted. Structural relationship

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  • Method for forecasting uniaxial constitutive relation of material according to press hardness
  • Method for forecasting uniaxial constitutive relation of material according to press hardness
  • Method for forecasting uniaxial constitutive relation of material according to press hardness

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Embodiment

[0047] Indentation hardness tests were carried out on the same T225NG titanium alloy sample using conical indenters with cone half angles of 60° and 70.3° respectively, and the uniaxial constitutive curves were obtained. image 3 Indentation load-depth curves of T225NG titanium alloy samples obtained by indentation tests of 60° and 70.3° conical indenters respectively. The data processing flow is as follows: firstly, the maximum load P is extracted from the press-in load-depth curve max And the corresponding maximum indentation depth h max , and obtain the elastic contact stiffness S from the curve of the unloading section, and then calculate the contact depth between the indenter and the sample Therefore, the indentation hardness of the conical indenter corresponding to different cone angles is Then the hardness H corresponding to the two conical indenters will be obtained C_θ Substituting into formula (5) to obtain the constitutive parameters E, σ y , n, and finally th...

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Abstract

The invention discloses a method for forecasting the uniaxial constitutive relation of material according to press hardness, comprising the following steps: in a press hardness detecting system consisting of a press head loading unit, a deformation detecting unit and a data processing unit, the press head loading unit presses material to be detected by press heads with different appearances, and the deformation detecting unit detects the corresponding deformation of the material to be detected and inputs into the data processing unit to obtain the constitutive parameters E, sigma y and n of forecasting material, so that the portable measurement of the uniaxial constitutive relation of the material and the serviced structural part can be realized by the simple method for forecasting the uniaxial constitutive relation of the material according to the press hardness.

Description

Technical field: [0001] The invention relates to the performance detection of metal materials, especially the detection field of the uniaxial constitutive relationship of in-service component materials. Background technique: [0002] Uniaxial stress-strain curve (ie, constitutive relationship), as the most basic mechanical properties of materials, plays an important role in the design and service of engineering components. The usual way to obtain the uniaxial constitutive relationship of materials is to take standard tensile samples from raw materials or engineering components and then conduct tensile tests in the laboratory. However, standard specimens are not allowed to be taken from service engineering components that are subject to damage, aging, etc., which makes the traditional tensile test method unable to be used for uniaxial constitutive relationship measurement of in-service components. On the other hand, for welded structures, the uniaxial constitutive relations ...

Claims

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Application Information

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IPC IPC(8): G01N3/42
Inventor 蔡力勋包陈姚博
Owner SOUTHWEST JIAOTONG UNIV
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