Measuring method for residual stress in coating

A technology of internal residual stress and measurement method, which is applied in measuring devices, instruments, and mechanical devices, etc., can solve the problems of increased difficulty in obtaining closed solutions of residual stress in multilayer coatings, coating errors, etc.

Inactive Publication Date: 2009-07-08
ACADEMY OF ARMORED FORCES ENG PLA
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  • Abstract
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Problems solved by technology

However, due to the limitation of deformation coordination conditions, the difficulty of obtaining the closed solution of residual stress of multi-layer coatings increases with the increase of coating layers
In this case, two methods are generally used to obtain the internal re...

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  • Measuring method for residual stress in coating
  • Measuring method for residual stress in coating
  • Measuring method for residual stress in coating

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] In the present invention, the composition of coating generally adopts figure 1 The structure shown is represented. figure 1 in, t s Indicates the thickness of the substrate, t c Indicates the thickness of the entire coating, t i Indicates the thickness of the i-th layer of coating, h i Indicates the distance from the upper surface of the i-th coating to the interface between the coating and the substrate, h i-1 Indicates the distance from the lower surface of the i-th coating to the interface between the coating and the substrate.

[0031] Such as figure 2 As shown, the determination method of the internal residual stress of the coating includes the following steps:

[0032] 1) Determine the temperature difference ΔT, the number of layers n of the coating to be tested, and the thickness t of the substrate s , effective elastic modulus Coefficient of t...

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Abstract

The invention discloses a method for measuring the residual stress inside the coating, which comprises the following steps: determining the parameters of temperature difference, a coating to be measured and a substrate; calculating the distance delta between a bending moment axial line and the coating, the curvature K of the bending moment axial line and the substrate interface, and the strain component epsilon i of plane direction caused by each layer of the plane stress of the coating; calculating the straining of each layer of the coating according to that epsilon i is equal to epsilon i+K(z+epsilon); and calculating the residual stress sigma i inside each layer of the coating according to that sigma i is equal to Ei'epsilon i. The method not only can accurately measure the residual stress value inside common multilayer coating, but also can accurately measure the residual stress value inside each layer of the functional gradient coating, and provide effective theoretical basis for the optimal design of materials before manufacturing the coating.

Description

technical field [0001] The invention relates to a method for measuring residual stress, in particular to a method for measuring internal residual stress of a coating. Background technique [0002] Due to the thermal expansion coefficient mismatch between the coating and the substrate, the coating and the substrate will deform as the temperature changes, and residual stress will be generated inside the coating, and these residual stresses will seriously affect some of the main properties of the coating. Such as peeling resistance, fatigue life, bonding strength, etc. Therefore, in order to improve the service life and mechanical integrity of the coating, it is of great engineering significance to predict the residual stress value and stress state inside the coating. [0003] At present, the known methods for obtaining the residual stress of a single-layer coating include: using the deformation coordination conditions of the coating and the substrate to obtain a theoretical s...

Claims

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Application Information

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IPC IPC(8): G01N19/04
Inventor 徐滨士张显程王海斗吴毅雄
Owner ACADEMY OF ARMORED FORCES ENG PLA
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