Influence of the contact-surface-connection on the strain distribution in a steel container

• Autorzy: Patorski J. , Groeschel F. , Bauer G.
• Konferencja: VIII Konferencja Naukowa pt. Połączenia i węzły w konstrukcjach metalowych, Olsztyn - Łańsk, 16-19 października 2003
• Języki publikacji: EN

Abstrakty

EN

The phenomenon of a long-term time expansion of frozen Lead-Bismuth Eutectic (LBE) should be taken into account for the integrity of liquid metal (LM) steel containers (4 m long cylinder) during operation and handling of a spallation neutron source target, (e.g. transportation of the target in a horizontal position as a simple supported beam, stiffer by connection with solidified LBE). The temperature dependency of the LBE time expansion in the range from freezing (approx. 125 °C) to room temperature (RT) and the effect of mechanical constraints are unknown. The experimental investigations have been performed at Paul Scherrer Institute (PSI) on a model of LM container from steel. The model has been instrumented with strain gauges (SG) and thermocouples (TC). The results show, that after two weeks from solidification of the LBE inside of LM container, the connection between both metals: steel and LBE, has caused the overstressing of the steel container. The maximal strains occur at the lowest exposure temperature and are located in the lower part of the LM container near the hemispherical enclosure of the cylindrical vessel. With rising temperature the strains decrease drastically. The extent of expansion in the direction of constraint was found markedly smaller than that communicated for freely expanding conditions. This behavior can be explained by plastic flow of the LBE and the decrease of the shear yield stress of the LBE caused by rising temperature. To avoid the overstressing of the embrittlemented steel in area of the hemispherical proton beam entrance window, the special zone freezing procedure has been proposed.

Słowa kluczowe

EN

experimental analysis of steel structures; strain gauges examination; volume (time and temperature) expansion loads; bimetallic constructions

PL

badanie eksperymentalne; materiał bimetaliczny; struktura stali

• Wydawca: Polska Izba Konstrukcji Stalowych
• Czasopismo: Konstrukcje Stalowe
• Rocznik: 2003
• Tom: nr 5 spec.
• Strony: CD--CD
• Opis fizyczny: -ROM, s. 341--349, Bibliogr. 5 poz., il.

Twórcy

autor

Patorski J.

• Paul Scherrer Institute, Villigen, Switzerland

autor

Groeschel F.

• Paul Scherrer Institute, Villigen, Switzerland

autor

Bauer G.

• Paul Scherrer Institute, Villigen, Switzerland

Bibliografia

• [1] Squires G.L.: Thermal Neutron Scattering. Cambridge University Press, Cambridge, 1978.
• [2] Lovesey S.W.: Theory of Neutron Scattering from Condensed Matter. International Series of Monographs on Physics 72, Oxford Science Publications, Oxford 1987.
• [3] Bercher R., Stuhr U., Editors: Anwenderworkshop zu Spannungsfeldmessungen mittels Neutronen. PSI-Proceedings 02-03, ISSN 1019-6447. Paul Scherrer Institut, CH-5232 Villigen, Switzerland, November 2002.
• [4] E.H. Pylchenkov, The issue of freezing-defreezing Lead-Bismuth liquid metal coolant in reactor facilities circuits. Proceedings of Heavy Liquid Metal Coolants in Nuclear Technology-98, SSC, Obninsk, Russia, 1999.
• [5] Y. Takeda, Volume change of LBE after solidification., PSI Scientific and Technical Report 2001, , (Large Research Facilities, Volume VI), Paul Scherrer Institute, PSI, CH-5232 Villigen, Switzerland, March 2002.