Residual Stress Measurement in Coated Plates Using Layer Growing/ Removing Methods: 100&lt;sup&gt;Th&lt;/sup&gt; Anniversary of the Publication of Stoney’s Paper “the Tension of Metallic Films Deposited by Electrolysis”

Jakub Kõo,Jaak Valgur

doi:10.4028/www.scientific.net/msf.681.165

Residual Stress Measurement in Coated Plates Using Layer Growing/ Removing Methods: 100<sup>Th</sup> Anniversary of the Publication of Stoney’s Paper “the Tension of Metallic Films Deposited by Electrolysis”

Jakub Kõo, Jaak Valgur

Open Access

https://doi.org/10.4028/www.scientific.net/msf.681.165

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Journal: Materials Science Forum	Publication Date: Mar 1, 2011
Citations: 5	License type: CC BY 4.0

Affiliation: Estonian University of Life Sciences

Abstract

In connection with the 100th anniversary of Stoney’s equations, some historical remarks are made with respect to the development of these equations. As an example of the extension of Stoney’s equations, a unique algorithm of the layer growing/removing methods is presented for determination of residual stresses in isotropic inhomogeneous coated plates. Using a computer program based on this algorithm, residual stresses are computed in the galvanic steel coating on the copper plate substrate.

Highlights

The layer growing method and the layer removing method are used for experimental determination of residual stresses in coated plates
This algorithm enables to calculate residual stresses from the curvature or strain measured on the stationary surface of the plate, as well as from initial stresses measured on the moving surface by the X-ray diffraction technique
In this study a special algorithm, following from the general algorithm for an isotropic inhomogeneous coated plate, is considered and applied for determination of residual stresses in a galvanic steel coating from the curvatures of a copper substrate measured during the growing process of coating

Summary

Introduction

The layer growing method (non-destructive method) and the layer removing method (destructive method) are used for experimental determination of residual stresses in coated plates. In paper [11] a common algorithm of the layer growing and layer removing methods is presented for determination of biaxial residual stresses in a free rectangular orthotropic inhomogeneous elastic plate whose elastic parameters depend on its thickness coordinate continuously or piecewise. This algorithm enables to calculate residual stresses from the curvature or strain measured on the stationary surface of the plate (substrate), as well as from initial stresses measured on the moving surface by the X-ray diffraction technique.

Results

Conclusion