On the mechanism of surface-parallel cracks formation under pulsed heat loads

•The deformations and mechanical stresses around a crack normal to surface that appeared under pulsed heat load are calculated.•Transverse to the exposed surface stresses may cause formation of cracks along the surface.•Emergence of perpendicular to irradiated surface cracks can be indirectly identi...

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Bibliographic Details
Published in:	Nuclear materials and energy Vol. 20; p. 100677
Main Authors:	Arakcheev, A.S., Arakcheev, S.A., Kandaurov, I.V., Kasatov, A.A., Kurkuchekov, V.V., Lazareva, G.G., Maksimova, A.G., Mashukov, V.I., Popov, V.A., Trunev, Yu.A., Vasilyev, A.A., Vyacheslavov, L.N.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-08-2019 Elsevier
Subjects:	Cracking Elasticity Electron beam Profilometry Pulsed heat load Theoretical simulation Tungsten Tungsten Cracking Elasticity Electron beam Theoretical simulation Pulsed heat load Profilometry
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Summary:	•The deformations and mechanical stresses around a crack normal to surface that appeared under pulsed heat load are calculated.•Transverse to the exposed surface stresses may cause formation of cracks along the surface.•Emergence of perpendicular to irradiated surface cracks can be indirectly identified by formation of “ridges”. This paper presents a model for calculating deformations and mechanical stresses around a crack normal to surface that appeared under pulsed heat load. The model was applied to calculation of stresses that may lead to formation of cracks along the surface, which are observed when tungsten is exposed to ITER-relevant heat load. It was found that such stresses might be not negligibly small in comparison with the ultimate tensile strength, and thus the appearance of cracks normal to the surface may leads to development of cracks parallel to the surface. The calculated deformation of the region around a crack is in good agreement with the experimental data. The deformations calculated can be a basis for experimental detection of formation of cracks normal and parallel to the surface.
ISSN:	2352-1791 2352-1791
DOI:	10.1016/j.nme.2019.100677