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Method for measuring curvature radius of APS coating residual stress test piece based on parabola model

A technology of parabolic model and residual stress, applied in measuring devices, force/torque/work measuring instruments, special data processing applications, etc., can solve problems such as difficulty in ensuring uniform deposition, uneven coating stress distribution, and different curvature, etc., to achieve The effect of low equipment cost, high degree of curve fitting and simple operation

Inactive Publication Date: 2021-06-01
CIVIL AVIATION UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual thermal spraying process, it is difficult to ensure uniform deposition of the coating during the deposition process, resulting in uneven distribution of residual stress inside the coating. The edge effect of the test piece will cause stress concentration on both sides of the coating, which eventually makes the test piece The curvature of each point on the sheet is different, and the curvature reaches the maximum near the midpoint of the test sheet, and decreases from the midpoint to both sides.

Method used

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  • Method for measuring curvature radius of APS coating residual stress test piece based on parabola model
  • Method for measuring curvature radius of APS coating residual stress test piece based on parabola model
  • Method for measuring curvature radius of APS coating residual stress test piece based on parabola model

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Embodiment Construction

[0023] Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] like figure 1 — image 3 As shown, the method for measuring the radius of curvature of the APS coating residual stress test piece based on the parabolic model provided by the present embodiment includes the following steps carried out in order:

[0025] 1) Preparation of APS coating residual stress test piece: select a nickel-based superalloy with a flat and smooth surface as the substrate, the length, width and height dimensions are 65mm×20mm×2mm, the curvature is guaranteed to be 0, the radius of curvature tends to infinity, and the overall stress is 0. Then plasma spraying is carried out on one side of the substrate to form an APS coating, the thickness of the APS coating is about 200 μm, and cooled to room temperature, thus making the APS coating r...

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Abstract

The invention discloses a method for measuring the curvature radius of an APS coating residual stress test piece based on a parabola model. The method comprises the steps of preparing an APS coating residual stress test piece; measuring arc height values of different points of the APS coating residual stress test piece; carrying out curve fitting; and establishing a parabola model. Compared with a traditional method for measuring the curvature radius of the coating, the method has the advantages that the overall curvature radius of the coating can be calculated through the curve fitting parabola model only by measuring the arc height values of different measuring points on the surface of the coating, the operation is easy, and the equipment cost is low. Compared with a traditional substrate bending method in which the whole coating is regarded as a section of arc to calculate the curvature radius, the method innovatively adopts the parabola model, the curve fitting degree is high, so that the requirement for accurate measurement of the curvature radius of the residual stress test piece under the actual working condition can be met.

Description

technical field [0001] The invention belongs to the technical field of precise measurement, in particular to a method for measuring the radius of curvature of an APS coating residual stress test piece based on a parabola model. Background technique [0002] Atmospheric plasma spraying (APS) is a surface strengthening technology widely used in the preparation of coatings for hot-end components in aerospace, automotive and other fields. It has the advantages of wide adaptability of coating materials and high degree of automation. In the process of thermal spraying of APS coating, the APS coating and the substrate will experience a drastic temperature difference change; due to the difference in the thermophysical properties of the APS coating and the substrate material, the sudden change of temperature will cause a certain amount of heat inside the APS coating. Residual stress leads to a certain degree of bending deformation of the sprayed product, which reduces the overall lif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/20G01L5/00G06F30/20
CPCG01B21/20G01L5/0047G06F30/20
Inventor 程涛涛王仕成韩志勇王志平
Owner CIVIL AVIATION UNIV OF CHINA
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