Determination of uniaxial stresses in steel structures by the laser-ultrasonic method


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Abstract

This paper describes the experimental implementation of the laser-ultrasonic method for diagnosing mechanical compression and tensile stresses in steel structures, based on the acoustoelasticity effect. The special laser-ultrasonic transducer that provides the laser excitation and highly sensitive piezoelectric detection of head (longitudinal subsurface) ultrasonic waves is developed. It is shown on the example of R65 rail samples of various quality that, regardless of the structural phase state of the rail, there is one and the same linear relationship between the relative variation of the velocity of head ultrasonic waves and the absolute value of uniaxial compression and tensile stresses acting in the rail.

About the authors

A. A. Karabutov

International Laser Center of M. V. Lomonosov Moscow State University; Moscow State Mining University of the National University of Science and Technology

Author for correspondence.
Email: aak@ilc.edu.ru
Russian Federation, Moscow, 119991; Moscow, 119991

N. B. Podymova

M. V. Lomonosov Moscow State University; Moscow State Mining University of the National University of Science and Technology

Email: aak@ilc.edu.ru
Russian Federation, Moscow, 119991; Moscow, 119991

E. B. Cherepetskaya

Moscow State Mining University of the National University of Science and Technology

Email: aak@ilc.edu.ru
Russian Federation, Moscow, 119991

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