Choice of Model of Reconstruction of a Temperature Profile for the Ultrasonic Non-destructive Testing of the Closed Construction of Unilateral Access in Non-Stationary Thermal Conditions
V. A. Mykhailovskyy, M. O. Dordienko, O. I. Zaporozhets
G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
Received: 08.06.2015. Download: PDF
A quantitative analysis of the theoretical models of the semi-infinite plate (SIP) and the finite-thickness plate (FTP) for usage during ultrasonic nondestructive testing (UNDT) of the temperature field, $T(x, t)$, in the wall of a closed construction with one-side access under the non-stationary thermal conditions is performed. The theoretical calculations of $T(x, t)$ are compared with the corresponding experimental data obtained on bulky specimens of hull steel 15Cr2MFA of the WWER-440 reactor, which are subjected to pulsed thermal loading (PTL). As found, the SIP model is effective for UNDT of the inner layers of the wall surface of the construction (with depth $h \leq$ 20—25 mm) and small times of control after the PTL ($t <$ 10—20 s), but the FTP model can be used for significantly more long-term control ($t$ = 0—500 s). As shown, the most optimal for UNDT is using the $T(x, t)$ of both models simultaneously.
Key words: ultrasonic testing, temperature field, wall of the reactor vessel.
PACS: 07.05.Dz, 07.20.Dt, 07.64.+z, 28.41.My, 28.41.Te, 28.52.Nh, 43.58.+z
Citation: V. A. Mykhailovskyy, M. O. Dordienko, and O. I. Zaporozhets, Choice of Model of Reconstruction of a Temperature Profile for the Ultrasonic Non-destructive Testing of the Closed Construction of Unilateral Access in Non-Stationary Thermal Conditions, Metallofiz. Noveishie Tekhnol., 37, No. 8: 1027—1036 (2015) (in Russian)