NDT Technology

NDT Technology

Feasibility of digital image correlation for non-destructive evaluation

Document Type : Original Article

Authors
Hamidreza Asemani 1
Abdalrahman Haghighi 2
Hadi Rezghi Maleki 3
Nasser Soltani 1
1 Intelligence Based Experimental Mechanics Center, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
2 Intelligence-Based Experimental Mechanics Center, Department of Mechanical Engineering, College of Engineering, University of Tehran
3 Assistant Professor - University of Bonab
10.30494/jndt.2021.277424.1066
Abstract
Digital image correlation (DIC) is widely used as a tool to measure displacements and surface strains. The generation of speckle pattern in DIC technique has some limitations. In addition to spray paint, other techniques including laser speckle have also been proposed to generate speckle patterns. In previous studies, the use of DIC as a non-destructive technique has been limited to detect the surface cracks. In the current study, the feasibility of DIC for detection of subsurface defects was investigated. A laser beam was utilized to generate the DIC speckle pattern. The tensile load was applied to a polypropylene specimen containing an artificial subsurface defect. The DIC images were recorded and analyzed before and after loading the specimen. The results of surface displacement in the direction of tension and perpendicular to tension revealed the defect. To study further, the surface strains of the specimen were determined. In the obtained results, the strain concentration indicated the defect in the specimen. The approximate size and shape of the artificial defect are recognizable in the measured strain distribution.
Keywords
Laser DIC
Speckle pattern
Non-destructive testing
Subsurface defects

Subjects

 
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  • Receive Date 15 March 2021
  • Revise Date 18 May 2021
  • Accept Date 22 May 2021