Contents

Russian Journal of Nondestructive Testing

Vol. 57, No. 1, 2021

Acoustic Methods

Constructing Dispersion Characteristic of Adjustment Factor When Testing Compact Square-Section Products Using Impact Echo Method

V. K. Kachanov, I. V. Sokolov, A. A. Samokrutov, V. G. Shevaldykin, S. A. Fedorenko, S. G. Alekhin, A. V. Kozlov and N. K. Pichugin p. 1  abstract

Experimental Study of Diffraction of Elastic Waves on Crack Model

N. P. Aleshin, N. V. Krysko, D. M. Kozlov and A. G. Kusyy p. 13  abstract

On the Specific Features of Using the Phenomenon of Acoustoelasticity When Testing the Stress State of Anisotropic Material of Technical Objects at Subzero Temperatures

A. A. Khlybov, A. L. Uglov and D. A. Ryabov p. 21  abstract

Kinetics of Damage Accumulation and Failure in the Zones of Stress Raisers in Sample Rupture Tests

N. A. Makhutov, I. E. Vasiliev, D. V. Chernov, V. I. Ivanov and E. V. Terent’ev p. 31  abstract

Wavelet Packet Analysis of Shotcrete-Rock Structures Using the Impact-Echo Method

Yao Fei, Cao Yimin and Chen Guangyu p. 43  abstract

Experimental Investigation of the Parameters Influencing the Surface Defect Detection by Using the Critically Refracted Longitudinal Waves

Wahiba Djerir, Mohamed Ourak and Tarek Boutkedjirt p. 55  abstract

Radio Wave Methods

Patch-Based Weld Defect Segmentation and Classification Using Anisotropic Diffusion Image Enhancement Combined with Support-Vector Machine

Reza Faghihi, Mohammadjavad Faridafshin and Amir Movafeghi p. 61  abstract

Optical Methods

Detection and Segmentation of Cracks in Weld Images Using ANFIS Classification Method

L. Mohana Sundari and P. Sivakumar p. 72  abstract

Errata

Erratum to: Intelligence Systems for Quality Assessment of Threaded Surfaces and Flaw Monitoring Based on Digital Light Field Recording

J. Olt, V. V. Maksarov and V. E. Makhov p. 83  abstract