Automatic analysis of residual stresses in rails in the modified moire interferometry system

1994 ◽  
Author(s):  
Leszek A. Salbut ◽  
Malgorzata Kujawinska ◽  
Jacek Kapkowski
Keyword(s):  
Residual Stresses ◽  
Moiré Interferometry ◽  
Automatic Analysis ◽  
Moire Interferometry

Experimental Investigation of Residual Stresses in Layered Materials Using Moire´ Interferometry

2002 ◽  
Vol 124 (4) ◽  
pp. 340-344 ◽  
Author(s):  
Keith B. Bowman ◽  
David H. Mollenhauer
Keyword(s):  
Residual Stresses ◽  
Thermal Loading ◽  
Elevated Temperatures ◽  
Dissimilar Materials ◽  
Layered Materials ◽  
Moiré Interferometry ◽  
Moire Interferometry ◽  
Material System ◽  
Interlaminar Stresses ◽  
Free Edges

As two dissimilar materials are bonded or cocured at elevated temperatures, residual stresses result upon cooling the layered material system to room temperature. It is well known that the free edges of composite laminates experience interlaminar stresses during applied mechanical or thermal loading. These stresses are significant and must be understood. Current experimental methods are not capable of determining the residual stresses along free edges where failure is likely to initiate. This paper describes the initial findings of a novel experimental technique that uses moire´ interferometry and material removal to determine the residual stress distribution resulting from elevated temperature processing at the free edges of layered materials.  

Study of Residual Stress Distribution by a Combined Method of Moire´ Interferometry and Incremental Hole Drilling, Part I: Theory

1998 ◽  
Vol 65 (4) ◽  
pp. 837-843 ◽  
Author(s):  
Zhu Wu ◽  
Jian Lu ◽  
Bongtae Han
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Plane Surface ◽  
Moiré Interferometry ◽  
Hole Drilling ◽  
Moire Interferometry ◽  
Hole Drilling Method ◽  
Surface Displacements ◽  
Incremental Hole Drilling ◽  
Drilling Method

A new method combining Moire´ interferometry and the incremental hole-drilling method is developed to determine both uniform and nonuniform residual stress distribution in depth. The study is reported in two parts. In this first part, the theoretical development of the moire´ interferometry hole-drilling method is presented. The relationship between the in-plane surface displacements produced by introducing a blind hole and the corresponding residual stresses is established by employing the existing theoretical solution containing a set of undetermined coefficients. The coefficients are calibrated by the three-dimensional finite element method and they are processed nondimensionally for general use. The whole field in-plane surface displacements data Ux and Uy produced by the relaxation of residual stresses are obtained from moire´ interferometry after each increment of hole drilling. The high signal-to-noise ratio provided by moire´ interferometry allows accurate determination of fringe orders near the hole boundary which is essential for enhancing fidelity of residual stress determination. The experimental procedure to determine the signs of residual stresses is described and the accuracy of the method is also discussed.

A study on residual stresses in polymer composites using moiré interferometry

2004 ◽  
Vol 13 (3-4) ◽  
pp. 237-253 ◽  
Author(s):  
Krishnakumar Shankar ◽  
Huimin Xie ◽  
Riyu Wei ◽  
Anand Asundi ◽  
Chai Gin Boay
Keyword(s):  
Residual Stresses ◽  
Polymer Composites ◽  
Moiré Interferometry ◽  
Moire Interferometry
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