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Global-local deformation measurement of stress concentration structures using a multi-digital image correlation system

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Abstract

The digital image correlation (DIC) technique is a method of measuring the displacement and strain of the entire area of a structure by comparing surface images taken by digital cameras before and after deformation of the structure. The DIC technique is currently being spotlighted because it can overcome the weakness of conventional contact measurement methods. So far a single DIC system with one camera or two cameras has been used for most applications. However, many structures need two or more DIC systems in order to measure their deformation efficiently and precisely. For example, the stress concentration problem and the cylindrical shell buckling problem are typical applications for a multi-DIC system. This study focuses on the stress concentration problem. The paper presents a globallocal deformation measurement method with a multi-DIC system. First, a tensile test of an aluminum beam was performed and compared with the strain gage method to validate the accuracy of DIC method. Then the tensile test specimens with a hole or a notch were prepared, and one DIC system measured the local deformation near a hole or a notch and the other DIC system measured the global deformation of the specimen. The results confirmed the proposed multi-DIC technique can be applied to the stress concentration problem.

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Abbreviations

ε t :

True strain

ε e :

Engineering strain

ε pl :

Plastic strain

ε el :

Elastic strain

ε t :

Total strain

σ t :

True stress

σ e :

Engineering stress

J IC :

Critical value of fracture energy

a :

Crack length

b :

Un-crack length

B :

Thickness of the specimen

U :

Energy under the load displacement curve

W :

Width of the specimen

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Acknowledgments

The investigation for this work was supported by the Ministry of Education Science and Technology (MEST) as a project of the “Space Core Technology Development Program” (NRFNRF- 2018M1A3A3A02065278). The authors are grateful for the financial support.

Author information

Authors and Affiliations

  1. Smart Microsystem Research Laboratory, Department of Advanced Technology Fusion, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Korea

    Taijun Zhao & Vinh Tung Le

  2. Smart Microsystem Research Laboratory, Department of Aerospace Information Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Korea

    Nam Seo Goo

Authors
  1. Taijun Zhao
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  2. Vinh Tung Le
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Corresponding author

Correspondence to Nam Seo Goo.

Additional information

Recommended by Editor Seungjae Min

Taijun Zhao graduated from Department of Mechanical Design, Manufacturing & Automation of Yianbian University of Science and Technology, China in 2015, and M.S. in the Department of Advanced Technology Fusion, Konkuk University, South Korea in 2019. His research interests are material and structural analysis and characterization.

Vinh Tung Le received his B.S. in Aeronautics from Department of Aerospace Engineering of Ho Chi Minh City University of Technology, Vietnam in 2013, and M.S. in the Department of Advanced Technology Fusion, Konkuk University, South Korea in 2015. He finished his Ph.D. defense at Konkuk University in 2019. His research interests are material and structural analysis and characterization.

Nam Seo Goo graduated from Department of Aeronautics Engineering of Seoul National University with honors in 1990, and earned M.S. and Ph.D. in Aerospace Engineering at the same university in 1992 and 1996, respectively. His Ph.D. degree was on the structural dynamics of aerospace systems. As soon as he got a Ph.D. degree, he entered the Agency for Defense Development as a Senior Researcher. After four years’ service, he moved to Kyungpook National University as a research associate. He joined Department of Aerospace Engineering in Konkuk University, Seoul, Korea in 2002, currently serving a Professor of Department of Aerospace Information Engineering as well as Department of Advanced Fusion Technology. His current research interests are structural dynamics of small systems, smart structures and materials, hot structures and opto-mechanics.

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Zhao, T., Le, V.T. & Goo, N.S. Global-local deformation measurement of stress concentration structures using a multi-digital image correlation system. J Mech Sci Technol 34, 1655–1665 (2020). https://doi.org/10.1007/s12206-020-0328-8

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  • DOI: https://doi.org/10.1007/s12206-020-0328-8

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