Study of the Effect of Low Cycle Fatigue on the Parameters of Fracture Mechanics Using Speckle Interferometry
Abstract
Evolution of the parameters of fracture mechanics at different stages of low cycle damage is analyzed. The developed approach is based on processing the results of optical interferometric measurements of the deformation response to a small increment of the crack length. Three consecutive symmetrical notches are used to simulate the process of fatigue crack propagation through the zone of accumulated damage induced by low cycle fatigue. The magnitude of tangential component of the displacement measured at several points on the edge of the notch using speckle-inter-ferometry is an input experimental data. The first four coefficients of the Williams series solution are used to determine the stress intensity factor (SIF) and T-stress values. The values of crack opening, SIF and T-stress for cracks of different lengths are obtained at a fixed number of preliminary loading cycles Nc = 0, 100, 1000, 1800, 2500, and 3300. The dependences of the parameters of fracture mechanics for the cracks of fixed length on Nc number which illustrate a process of fatigue damage accumulation are constructed.
Keywords
low-cyclic fatigue,
stress intensity factor,
T-stress,
method of successively increasing crack length (crack compliance method),
speckle-interferometry,
малоцикловая усталость,
коэффициент интенсивности напряжений,
Т-напряжения,
метод последовательного наращивания длины трещины,
электронная спекл-интерферометрия
About the Authors
V. S. Pisarev
Центральный аэрогидродинамический институт им. проф. Н. Е. Жуковского
Russian Federation
Russian Federation
Yu. G. Matvienko
ИМАШ РАН им. А. А. Благонравова
Russian Federation
Russian Federation
S. I. Eleonskii
Центральный аэрогидродинамический институт им. проф. Н. Е. Жуковского
Russian Federation
Russian Federation
I. N. Odintsev
ИМАШ РАН им. А. А. Благонравова
Russian Federation
Russian Federation
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Review
For citations:
Pisarev V.S., Matvienko Yu.G., Eleonskii S.I., Odintsev I.N. Study of the Effect of Low Cycle Fatigue on the Parameters of Fracture Mechanics Using Speckle Interferometry. Industrial laboratory. Diagnostics of materials. 2016;82(6):44-56. (In Russ.)
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