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Evaluation method for early damage of additive manufacturing part based on metal magnetic memory detection

A metal magnetic memory and additive manufacturing technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, and analyzing materials, can solve the problems of early damage evaluation of parts that cannot be additively manufactured, and achieve accurate discrimination high rate effect

Active Publication Date: 2019-10-08
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Existing non-destructive testing technology cannot evaluate the early damage of additively manufactured parts

Method used

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  • Evaluation method for early damage of additive manufacturing part based on metal magnetic memory detection
  • Evaluation method for early damage of additive manufacturing part based on metal magnetic memory detection
  • Evaluation method for early damage of additive manufacturing part based on metal magnetic memory detection

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Embodiment

[0028] Embodiment: In this embodiment, the ferromagnetic additive manufacturing part with a V-shaped notch is taken as the research object, and different tensile loads are applied to it. After each loading, the surface magnetic memory signal is measured.

[0029] use as figure 2 The shown ferromagnetic additive manufacturing parts are samples used as embodiments, wherein each marked size (in mm) is as figure 2 shown.

[0030] First place the workpiece horizontally on the test bench, demagnetize the workpiece, and then use the TSC-3M-12 stress concentration magnetic detector to measure the magnetic memory signal on the surface of the workpiece when it is not loaded along the detection path, and measure the initial magnetic memory. signal attached image 3 shown. The workpiece is clamped on the tensile testing machine, and the magnetic memory signal on the surface of the workpiece is measured again under the workpiece clamping state, which is convenient for comparison with ...

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Abstract

The invention relates to an evaluation method for early damage of an additive manufacturing part based on metal magnetic memory detection and belongs to the field of metal magnetic memory detection innondestructive detection, wherein a mechanics theory and a force-magnetic coupling theory of ferromagnetic materials are used for guiding, and the variation condition of a residual magnetic inductionintensity standard deviation and a residual magnetic induction intensity gradient maximum value thereof along with the tensile load is used as an early damage state representation method of the additive manufacturing part. The residual magnetic induction intensity of the additive manufacturing part under different stretching states is detected by adopting a metal magnetic memory method, the earlydamage change process of the defect is characterized by the change of magnetic memory signals, and the residual magnetic induction intensity standard deviation and the residual magnetic field intensity gradient maximum value are used for representing the early damage situation of the additive manufacturing part. According to the method in the invention, the metal magnetic memory detection technology is combined with damage mechanics, the magneto-mechanical effect of the ferromagnetic additive manufacturing part is used to achieve nondestructive detection of the early damage of the ferromagnetic additive manufacturing part under the condition of not requiring magnetizing, and the judgment accuracy is high.

Description

technical field [0001] The invention relates to a method for non-destructive detection of ferromagnetic metal material additive manufacturing parts, in particular to a method for early damage evaluation of additive manufacturing parts based on metal magnetic memory detection, which is a method based on metal magnetic memory signals and changes in their parameters , an evaluation method for characterizing the early damage degree of defects in additively manufactured parts of ferromagnetic metal materials, belongs to the field of metal magnetic memory detection in nondestructive testing. Background technique [0002] The emergence of Additive Manufacturing (AM) technology is considered to be a cross-age technological innovation in the field of machinery manufacturing industry in the 21st century, and it is a key technology to achieve breakthroughs in high-end equipment manufacturing. [0003] During the use of ferromagnetic additive parts, due to the repeated action of alterna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N27/83
CPCG01N3/08G01N27/83G01N2203/0017
Inventor 于凤云郭绍炳张力猛张智波
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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