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

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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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Authors and Affiliations

  1. Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, Tehran, 16846-13114, Iran

    S. D. Salehi, M. A. Rastak & M. M. Shokrieh

  2. MSMP Laboratory, Arts et Métiers, 2, Cours des Arts et Métiers, 13617, Aix-en-Provence, France

    L. Barrallier & R. Kubler

Authors
  1. S. D. Salehi
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  2. M. A. Rastak
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  3. M. M. Shokrieh
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  4. L. Barrallier
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  5. R. Kubler
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Correspondence to M. M. Shokrieh.

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Salehi, S.D., Rastak, M.A., Shokrieh, M.M. et al. Full-Field Measurement of Residual Stresses in Composite Materials Using the Incremental Slitting and Digital Image Correlation Techniques. Exp Mech 60, 1239–1250 (2020). https://doi.org/10.1007/s11340-020-00640-2

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