Measurements of Deflection and Residual Stress in Thin Films Utilizing Coherent Light Reflection/Projection Moiré Interferometry

2013 ◽  
Vol 53 (6) ◽  
pp. 977-987 ◽  
Author(s):  
C. A. Sciammarella ◽  
A. Boccaccio ◽  
L. Lamberti ◽  
C. Pappalettere ◽  
A. Rizzo ◽  
...  
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Moiré Interferometry ◽  
Light Reflection ◽  
Moire Interferometry ◽  
Coherent Light ◽  
Projection Moire

Study of Surface Residual Stress by Three-Dimensional Displacement Data at a Single Point in Hole Drilling Method

1999 ◽  
Vol 122 (2) ◽  
pp. 215-220 ◽  
Author(s):  
Z. Wu ◽  
J. Lu
Keyword(s):  
Residual Stress ◽  
Single Point ◽  
Accurate Determination ◽  
Three Dimensional ◽  
Moiré Interferometry ◽  
Hole Drilling ◽  
Moire Interferometry ◽  
Blind Hole ◽  
Hole Drilling Method ◽  
Drilling Method

A method combining moire´ interferometry, Twyman–Green interferometry, and blind hole drilling method is proposed for simple and accurate determination of residual stress. The relationship between the three-dimensional surface displacements produced by introducing a blind hole and the corresponding residual stress is established by employing the Fourier expansion solution containing a set of undetermined coefficients. The coefficients are calibrated by 3D finite element method. The surface in-plane displacements Ux,Uy, and the out-of-plane displacement Uz produced by the relaxation of residual stress are measured by moire´ interferometry and Twyman–Green interferometry, respectively, after the hole-drilling procedure. The complete three-dimensional displacement data at any single point around the hole can be used for residual stress determination. The accuracy of the method is analyzed and the experimental procedure is described to determine the sign of residual stresses. As an implementation of the method, a shot peening residual stress problem is studied. [S0094-4289(00)00802-1]

Experimental Measurement of Residual Stress on Thermal Spray Coatings with Moire Interferometry and Hole-Drilling Method

2015 ◽  
Vol 782 ◽  
pp. 335-340
Author(s):  
Jian Guo Zhu ◽  
Bao Ge Zhang
Keyword(s):  
Residual Stress ◽  
Surface Displacement ◽  
Moiré Interferometry ◽  
Hole Drilling ◽  
Moire Interferometry ◽  
Spray Coatings ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
Sprayed Coating ◽  
Thermally Sprayed

Residual stress is one of the important factors in thermally sprayed deposits which affects both processing and performances. In the present study, the hole-drilling method and moire interferometry were used to determine the residual stress of thermally sprayed coatings to overcome certain limitations of the strain rosette version of hole drilling. The methodology was established based on the elastic theory and finite element method. The residual displacement was measured by moire interferometry and the residual stress of the thermally sprayed coating was calculated. The results have demonstrated that moire interferometry for surface displacement caused by hole-drilling is high sensitive, reliable and stable.

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