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TsAGI Science Journal

ISSN Imprimer: 1948-2590
ISSN En ligne: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2016016417
pages 807-832

INVESTIGATION OF CRACK PROPAGATION PROCESS BY MEASUREMENTS OF LOCAL DEFORMATION RESPONSE: II. RESIDUAL STRESS FIELD

Andrei Alexandrovich Apalkov
Institute of Machines Sciences named after A. A. Blagonravov of the Russian Academy of Sciences, 4 Maly Kharitonyevsky Pereulok, Moscow, 101990 Russian Federation
Svyatoslav Igorevich Eleonskii
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, 140180, Moscow Region, Russia
Igor Nikolaevich Odintsev
Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASh RAN), 4 M. Kharitonyevskiy Pereulok, Moscow, 101990, Russian Federation
Vladimir Sergeevich Pisarev
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia

RÉSUMÉ

The principal questions in relation to determining the fracture mechanics parameters for cracks in a residual stress field are analyzed using a modified version of the crack compliance method. It is shown that this approach can be effectively used for non-symmetrical cracks, which appear near a welded seam. Detailed metrological verification of the process used to generate initial experimental data is presented. The procedure is based on comparing corresponding values measured by reflection hologram interferometry and electronic speckle interferometry. Special attention is paid to the measurements of the in-plane displacement components near the area of local material removal. Both residual stress determination and determination of the stress intensity factor (SIF) and T-stress values for a small crack length increment are considered for the same residual stress field. For this purpose, a scheme for a combined interferometer is developed and realized. This optical system is capable of simultaneous measurement of the local deformation response by two different interference techniques on opposite faces of a thin plate. The practical implementation of the developed technique is illustrated by constructing dependencies of the SIF and T-stress values from a crack length, which is located in the vicinity of the joint made by electronic beam welding.


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