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Experimental Mechanics
Published in: Experimental Mechanics 9/2020

17-08-2020 | Research paper

Full-Field Measurement of Residual Stresses in Composite Materials Using the Incremental Slitting and Digital Image Correlation Techniques

Authors: S. D. Salehi, M. A. Rastak, M. M. Shokrieh, L. Barrallier, R. Kubler

Published in: Experimental Mechanics | Issue 9/2020

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Abstract

Background

The slitting method is a widely used destructive technique for the determination of residual stresses. Because of the rich data content of the full-field methods, optical techniques such as digital image correlation (DIC) are replacing strain gages for surface measurements.

Objective

The objective of the current paper is to overcome the difficulties that arise in using the DIC technique combined with the slitting method. The present noise, low signal-to-noise ratio, and systematic errors are the main impediments to the use of DIC in the slitting method.

Methods

An approach based on the eigenstrain concept was exploited to ascertain the optimum region of interest (ROI) for the analysis. After that, a robust procedure was implemented to utilize the DIC method while excluding the rigid body motion and rotation artifacts from the obtained displacements.

Results

Different slitting steps may cause dissimilar rigid body motions and rotations of the specimen. The proposed method was able to eliminate all of these different shears and stretches in the images simultaneously. The slitting experiment was conducted on a symmetric cross-ply composite specimen, and the slit progressed down to half the thickness. Although some rigid body motions were large, the method managed to exclude all of them for eight slitting steps.

Conclusion

A comparison made between the results of the current method and those of the strain gage technique shows that they are in acceptable agreement with each other, and this full-field method can be extended to smaller scales or other destructive techniques.
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Metadata
Title
Full-Field Measurement of Residual Stresses in Composite Materials Using the Incremental Slitting and Digital Image Correlation Techniques
Authors
S. D. Salehi
M. A. Rastak
M. M. Shokrieh
L. Barrallier
R. Kubler
Publication date
17-08-2020
Publisher
Springer US
Published in
Experimental Mechanics / Issue 9/2020
Print ISSN: 0014-4851
Electronic ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-020-00640-2

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