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AbstractAbstract
[en] The structural analysis of dynamically excited piping systems as performed with the numerical method of Finite Elements (FE) is usually based on simple beam elements. However, in order to establish their applicability, the computer programs used for the structural analysis must be verified on the basis of large-scale experiments. The behaviour of the extremely endangered elbows is considered with the help of an experimentally and numerically analyzed piping system. The influences of form effects (cross-section ovalization) in the elbows are isolated from the measured total stresses by a new method and their importance for a comparison between experiment and calculation is shown. (orig.)
[de]
Im Rohrleitungsbau und insbesondere in der nuklearen Kraftwerkstechnik, sind die Rohrboegen die am staerksten beanspruchten Konstruktionselemente. Biegemomente, die durch thermische Belastung, schnelles Schliessen von Sicherheitsventilen, Wasserhammer usw. entstehen, belasten die Rohrleitung, wobei die Rohrboegen ihre urspruenglich kreisrunden Querschnitte aendern (Ovalisierung). Diese Eigenschaft der Kruemmerquerschnitte ist der Grund fuer ihre hoehere Flexibilitaet und die zusaetzlichen Spannungen in den Rohrbogenbereichen. Der vorliegende Beitrag beschreibt eine einfache Naeherungsmethode, welche die Quantifizierung der Ovalisierungseinfluesse in der Rohrleitung auf Grund von Dehnungsmessungen ermoeglicht. Dies erlaubt die Behandlung relevanter Fragen wie die experimentelle Verifizierung von FE-Programmen und -modellen und der entsprechenden Regelwerte fuer Rohrboegen (Korrekturfaktoren fuer Flexibilitaet und Spannung). (orig.)Original Title
Ein numerisches Verfahren zur Ermittlung der Ovalisierungseinfluesse in Rohrleitungen aus Versuchsergebnissen
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Record Type
Journal Article
Journal
Forschung im Ingenieurwesen; ISSN 0015-7899;
; v. 51(1); p. 19-21

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AbstractAbstract
No abstract available
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Journal Article
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Genshiryoku Kogyo; v. 17(3); p. 5-10
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AbstractAbstract
No abstract available
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Oct 1970; 17 p
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Report
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Merino, Mario; Ahedo, Eduardo, E-mail: mario.merino@uc3m.es2016
AbstractAbstract
[en] A two-fluid, two-dimensional model of the plasma expansion in a divergent magnetic nozzle is used to investigate the effect of the plasma-induced magnetic field on the acceleration and divergence of the plasma jet self-consistently. The induced field is diamagnetic and opposes the applied one, increasing the divergence of the magnetic nozzle and weakening its strength. This has a direct impact on the propulsive performance of the device, the demagnetization and detachment of the plasma, and can lead to the appearance of zero-field points and separatrix surfaces downstream. In contrast, the azimuthal induced field, albeit non-zero, is small in all cases of practical interest. (paper)
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Available from http://dx.doi.org/10.1088/0963-0252/25/4/045012; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
Plasma Sources Science and Technology; ISSN 0963-0252;
; v. 25(4); [9 p.]

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Taylor, A.; McDonald, S.G.
Argonne National Lab., Ill. (USA)1971
Argonne National Lab., Ill. (USA)1971
AbstractAbstract
No abstract available
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Jun 1971; 23 p; International conference on radiation-induced voids in metals; Albany, N. Y; 9 Jun 1971
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Report
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AbstractAbstract
No abstract available
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4. international conference on plutonium and other actinides; Sante Fe, N. Mex; 5 Oct 1970
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Journal Article
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Progress Report
Journal
Nucl. Met., Met. Soc. AIME; v. 17 p. 623-634
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AbstractAbstract
No abstract available
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2. international conference on high-voltage electron microscopy; Stockholm, Sweden; 14 Apr 1971
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Journal Article
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Conference
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Jernkontorets Annaler; v. 155(8); p. 525-526
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AbstractAbstract
No abstract available
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p. 65-80; 1971; Society of Aerospace Material and Process Engineers; Azusa, Calif; 16. national SAMPE symposium and exhibit; Anaheim, CA; 21 Apr 1971
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Book
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Conference
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AbstractAbstract
[en] In previous experiments, the potential profiles of an expanding plasma were measured to be consistent with the simulation results of another study. In the present experiment, free expansion of a filament discharged plasma across magnetic field lines are studied. The latest results are reported
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Source
Anon; p. 1A-6; 1985; p. 1A-6; IEEE Service Center; Piscataway, NJ (USA); Conference on plasma sciences; Pittsburgh, PA (USA); 3-5 Jun 1985
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Book
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Conference
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Lee, Dae Hee; Park, Jun Soo; Jeong, Seung Ha; Kim, Jong Min; Eom, Se Yoon
Korea Atomic Energy Research Inst., Daeduk (Korea, Republic of)1996
Korea Atomic Energy Research Inst., Daeduk (Korea, Republic of)1996
AbstractAbstract
[en] Lugs, brackets, stiffeners and other attachments may be welded, bolted and studded to the outside or inside of piping and the local stresses arise because of the radial thermal expansion of the piping, the dilatation of the piping due to its internal pressure, the circumferential contraction of the pipe as a results of an axial tensile force, etc., constrained by those. So the evaluation of the local stress for the piping constrained by the attachment in accordance with the ASME Section III, NB-3651.3, NC-3645 and ND-3645 are required for the Class 1, 2, and 3 piping. In this report, the formula for the local stress analysis for the piping welded to the seal plate was developed and the results from the theoretical analysis were compared with the results from the theoretical analysis were compared with the results analyzed by the ANSYS. The results from the theoretical analysis agree well to the results analyzed by the ANSYS with a conservatism. The conservatism in the theoretical analysis can be considered as a safety factor in the design stage. So, the formula developed in this report can be used very effectively for the design of the seal plate and the local stress analysis of the nuclear class 2 and 3 piping welded to the seal plate. 2 tabs., 7 figs., 5 refs. (Author) .new
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Jun 1996; 29 p
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Report
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