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Visualization of Mechanical Processes: An International Online Journal


ISSN Online: 2152-209X

Visualization of Mechanical Processes: An International Online Journal

DOI: 10.1615/VisMechProc.v1.i1.40

A ROLE OF HIGH-QUALITY INTERFERENCE FRINGE PATTERNS FOR THE RESIDUAL STRESSES DETERMINATION BY THE HOLE-DRILLING METHOD

Vladimir Sergeevich Pisarev
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia
Igor Nikolaevich Odintsev
Institute of Machines Sciences named after A. A. Blagonravov of the Russian Academy of Sciences, 4 Maly Kharitonyevsky Pereulok, Moscow, 101990 Russian Federation
A. A. Apalkov
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia
Andrei Vladimirovich Chernov
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia

ABSTRACT

The main questions related to increasing the accuracy of residual stress determination by combining the hole-drilling method and optical interferometric measurements of local deformation response are considered. All possible approaches of solving this problem have to be based on recording (of) high-quality interferograms with high fringe density at the local area of interest. For many cases such interference fringe patterns must be obtained on the opposite faces of thin-walled plane structures when a single probe hole is drilled. The required experimental procedure is illustrated for reflection hologram interferometry and for electronic speckle-pattern interferometry. The first of them and the most universal technique is implemented for a characterization of the residual stress field near the central cross section of the standard compact tension specimen with a transverse friction stir weld. A set of the interference fringe patterns, which are essential for deriving the required values of residual stress components within 5 percent accuracy proceeding from the general approach, is presented. The results obtained are illustrated by the distributions of the residual stress components in the weld vicinity. A specially designed optical system of electronic speckle-pattern interferometer is developed and tested. The main feature of this optical system resides in its capability of obtaining the interference fringe patterns near the probe hole, a quality which is comparable to analogous holographic interferograms. In this way a set of unique interference fringe patterns, which are related to a single probe hole drilled in the residual stress field and simultaneously obtained at the opposite faces of the thin plate, are recorded for the first time. The main feature of the developed optical setup resides in the fact that metrological parameters of the measurement system are substantiated and carefully verified by two different approaches. It is shown that the quality of the speckle-interferometric fringe patterns obtained is high enough to ensure determination of the residual stress component values within a 5 percent accuracy interval, as occurs in the case of reflection hologram interferometry implementation.