TY - JOUR

T1 - In situ method for studying stresses in a pulse-heated tungsten plate based on measurements of surface curvature

AU - Cherepanov, D. E.

AU - Arakcheev, A. S.

AU - Burdakov, A. V.

AU - Kandaurov, I. V.

AU - Kasatov, A. A.

AU - Popov, V. A.

AU - Ruktuev, A. A.

AU - Vasilyev, A. A.

AU - Vyacheslavov, L. N.

N1 - Funding Information: Measurements of the bending of a sample were financially supported by Russian Science Foundation (project 19-19-00272 ). Publisher Copyright: © 2021 The Authors Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - Damage of divertor tungsten tiles as a result of transient plasma processes is one of the key problems of the ITER tokamak. Even if the temperature of the divertor tiles is maintained below the melting threshold, their thermal deformation, accumulation of residual stresses and cracking will occur. Cracking reduces the resistance of the metal to subsequent loads, therefore, the study of this process is important. In materials science, non-destructive methods for measuring mechanical stresses are very limited. In this work, a new method is proposed that allows non-contact investigation of stresses in polycrystalline tungsten plates by their bending. A corresponding diagnostic system and theoretical model are implemented. A number of experiments were carried out using this diagnostic system at the BETA facility at the Budker Institute to study the dynamics of tungsten plates bending with different thickness, subjected to pulsed heating of different intensities. The experimental results showed the qualitatively expected process of the plate bending, as well as good agreement with the theoretical model. This proved that the method described in the work is promising for use in order to study the residual stresses in a pulse-heated metal sample.

AB - Damage of divertor tungsten tiles as a result of transient plasma processes is one of the key problems of the ITER tokamak. Even if the temperature of the divertor tiles is maintained below the melting threshold, their thermal deformation, accumulation of residual stresses and cracking will occur. Cracking reduces the resistance of the metal to subsequent loads, therefore, the study of this process is important. In materials science, non-destructive methods for measuring mechanical stresses are very limited. In this work, a new method is proposed that allows non-contact investigation of stresses in polycrystalline tungsten plates by their bending. A corresponding diagnostic system and theoretical model are implemented. A number of experiments were carried out using this diagnostic system at the BETA facility at the Budker Institute to study the dynamics of tungsten plates bending with different thickness, subjected to pulsed heating of different intensities. The experimental results showed the qualitatively expected process of the plate bending, as well as good agreement with the theoretical model. This proved that the method described in the work is promising for use in order to study the residual stresses in a pulse-heated metal sample.

KW - In situ diagnostics

KW - Residual stress

KW - Transient heat load

KW - Tungsten

UR - http://www.scopus.com/inward/record.url?scp=85100060996&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2021.100919

DO - 10.1016/j.nme.2021.100919

M3 - Article

AN - SCOPUS:85100060996

VL - 26

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

M1 - 100919

ER -