首页|Development of the Optical-Digital Methods of Monitoring of the Surfaces of Structural Elements for the Purposes of Technical Diagnostics
Development of the Optical-Digital Methods of Monitoring of the Surfaces of Structural Elements for the Purposes of Technical Diagnostics
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NSTL
Springer Nature
We analyze the optical-digital methods of monitoring of the surfaces of structural elements developed at the Karpenko Physicomechanical Institute of the National Academy of Sciences of Ukraine for the purposes of technical diagnostics. These methods are based on the principles of phase-shifting interferometry, digital speckle pattern interferometry, and digital image correlation. The advantages of the methods of two- and three-step phase shifting interferometry with arbitrary phase shifts of the reference beam over the conventional methods are estimated. On the basis of the method of three-step phase shifting interferometry, we developed a 3D profilometer aimed at measuring the parameters of roughness and waviness of the surface. The developed method of phase shifting digital speckle pattern interferometry is capable of reproducing the field of surface displacement by using only two pairs of speckle interferograms. This method is used for the solution of various problems of technical diagnostics and, in particular, for the detection of hidden holes and defects in metal specimens and welded joints. The digital image correlation methods are used to determine the fields of surface displacement near the crack faces and other stress concentrators, the stress intensity factors, the J-integral, the direction of crack propagation, and the boundaries of the plastic zone in the loaded specimen. To find the 3D fields of displacements, we propose a new 3D digital image correlation method with the help of which it became possible to measure the deformations of the surfaces of fuel tanks of launch vehicles.
NSTL
Springer Nature
