A linear least squares approach for evaluation of crack tip stress field parameters using DIC

R, Harilal and Vyasarayani, C P and M, Ramji (2015) A linear least squares approach for evaluation of crack tip stress field parameters using DIC. Optics and Lasers in Engineering, 75. pp. 95-102. ISSN 0143-8166

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In the present work, an experimental study is carried out to estimate the mixed-mode stress intensity factors (SIF) for different cracked specimen configurations using digital image correlation (DIC) technique. For the estimation of mixed-mode SIF׳s using DIC, a new algorithm is proposed for the extraction of crack tip location and coefficients in the multi-parameter displacement field equations. From those estimated coefficients, SIF could be extracted. The required displacement data surrounding the crack tip has been obtained using 2D-DIC technique. An open source 2D DIC software Ncorr is used for the displacement field extraction. The presented methodology has been used to extract mixed-mode SIF׳s for specimen configurations like single edge notch (SEN) specimen and centre slant crack (CSC) specimens made out of Al 2014-T6 alloy. The experimental results have been compared with the analytical values and they are found to be in good agreement, thereby confirming the accuracy of the algorithm being proposed.

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IITH Creators:
IITH CreatorsORCiD
Vyasarayani, Chandrika Prakashhttp://orcid.org/0000-0002-3396-0484
Item Type: Article
Additional Information: We thank Dr. Viswanath of IIT Hyderabad for several interesting discussions during the course of the study.
Uncontrolled Keywords: Digital image correlation; Ncorr; Stress intensity factor; Multi-paramater
Subjects: Physics > Mechanical and aerospace
Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 11 Aug 2015 05:54
Last Modified: 04 Mar 2022 05:32
URI: http://raiith.iith.ac.in/id/eprint/1835
Publisher URL: https://doi.org/10.1016/j.optlaseng.2015.07.004
OA policy: http://www.sherpa.ac.uk/romeo/issn/0143-8166/
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