Method for identifying anisotropic plasticity parameters of plate based on single-cone indentation

A technology of anisotropy and plastic parameters, applied in the direction of testing material hardness, etc., can solve problems such as the influence of sheet metal precision plastic forming, and achieve the effect of accurate experimental results and simple experimental process

Active Publication Date: 2018-01-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] Invention patent CN1042370370A discloses an instrumented indentation test method for elastic-plastic parameters of materials based on Berkovich indentation, and establishes a method for obtaining elastic-plastic mechanical properties of metal materials by indentation testing, but these studies are only for isotropic Material
Moreover, the existence of plastic anisotropy usually l

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  • Method for identifying anisotropic plasticity parameters of plate based on single-cone indentation
  • Method for identifying anisotropic plasticity parameters of plate based on single-cone indentation
  • Method for identifying anisotropic plasticity parameters of plate based on single-cone indentation

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Embodiment Construction

[0036] This embodiment is a method for identifying anisotropic plastic parameters of sheet metal based on single-cone pressing.

[0037] refer to Figure 1 to Figure 7 , this embodiment is based on a single-cone press-in method for identifying anisotropic plastic parameters of sheet metal, which is applied to micro-nano testing and hardness testing equipment; combined with three-dimensional confocal imaging equipment, small-sized test pieces and materials are realized. bit test. The material response information obtained through the indentation test can directly calculate the anisotropic plastic parameters of the tested material.

[0038] Step 1. Select a conical indenter with an inner half angle of 60° to establish a dimensionless function model

[0039]Using the Π theory of dimensional analysis, the relationship between the response parameters of the load-displacement curve of single-cone indentation, the response parameters of unloading residual indentation morphology and...

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Abstract

The invention discloses a method for identifying the anisotropic plasticity parameters of a plate based on single-cone indentation, used in the technical field of nondestructive testing and in-situ testing of anisotropic materials. The method comprises the following steps: establishing a numerical model for correlating the indentation response parameters and the plasticity parameters of an anisotropic material by using a dimensionless function; analyzing the material response of a single-cone indentation experiment to obtain the anisotropic plasticity parameters of a metal plate, and obtainingthe load-displacement relation curve of a test piece; testing the unloaded residual indentation morphology by a three-dimensional confocal microscopic device, and extracting the contact depth valuesof the residual indentation contour in two orthogonal directions of transverse and longitudinal lines of the tested material; and substituting the material response information extracted in the indentation experiment into the established dimensionless function model, and carrying out reverse calculation to obtain the anisotropic plastic parameters of the metal plate. The anisotropic plasticity mechanical parameters reversely calculated by the method are unique and have a high accuracy.

Description

technical field [0001] The invention relates to the technical field of testing the plastic mechanical properties of metal materials, in particular to a method for identifying anisotropic plastic parameters of sheet metal based on single-cone pressing. Background technique [0002] The use of indentation test technology to obtain the elastic-plastic mechanical properties of sheet metal materials has some advantages that traditional uniaxial tension or compression experiments do not have. On the one hand, the specimen preparation period for the indentation experiment is short, the experiment process is simple, and the experiment results are reliable. On the other hand, this test technology can be applied to the field of material mechanical performance testing that is inconvenient or impossible to apply to traditional unidirectional tensile or compression tests, such as non-destructive testing and in-situ testing of materials. At present, research on the use of indentation tes...

Claims

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Application Information

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IPC IPC(8): G01N3/42
Inventor 吴建军王明智邬洪飞惠钰展学鹏樊赫尚琪
Owner NORTHWESTERN POLYTECHNICAL UNIV
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