10.14489/td.2016.10.pp.052-056

2016, 10 October

DOI: 10.14489/td.2016.10.pp.052-056

Kurashkin K. V.
THE STRESS EVALUATION IN THE WELDED JOINTS BY THE ACOUSTIC METHOD
(pp. 52-56)

Abstract. The article deals with the actual problem of stress evaluation in the welded joints. The results of experimental studies of acoustoelastic effect in the plane welded samples made from steels 20, 15G2SF and 09G2S are presented. The samples are subjected to uniaxial loading in the elastic region. The propagation time of bulk transverse elastic waves corresponding to the current stress are measured by pulse echomethod. It is shown that the parameter of own acoustic anisotropy and the coefficients of acoustoelasticity change significantly with distance from the weld. This fact need to be taken into account for the stress evaluation by the acoustic method. The differences of values of parameter of own acoustic anisotropy and coefficients of acoustoelasticity at different distances from the weld are explained by the heterogeneity of the structural condition of material on the weld zone. The value of the parameter of own acoustic anisotropy is determined primarily by the crystallographic texture of material. The structural condition of the material has also a great influence on the values of the coefficients of acoustoelasticity. It is shown in the example of steel weld 15G2SF that the error of the stress evaluation may be 42 % without considering the changes in the heat affected zone.

Keywords: acoustoelastic effect, welded joint, stress evaluation.

+ - About the Authors Click to collapse

K. V. Kurashkin (Mechanical Engineering Research Institute of Russian Academy of Since, Nizhny Novgorod, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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