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Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Inst. de Recherche Technologique et de Developpement Industriel (IRDI)1985
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Inst. de Recherche Technologique et de Developpement Industriel (IRDI)1985
AbstractAbstract
[en] This paper shows, in the study of nuclear reactor structures, the complementarity of calculations and testing
[fr]
Cet article montre, dans le domaine des reacteurs nucleaires, la complementarite des calculs et des essais des structuresOriginal Title
Complementarite des calculs et des essais dans l'etude des structures
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Oct 1985; 6 p; Conference on testing for quality; Paris (France); 15-16 Oct 1985
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Hoffmann, A.; Jeanpierre, Francoise.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1976
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1976
AbstractAbstract
[en] TEDEL is intended for the elastoplastic computation of pipes and three-dimensional mechanical structures. Structures are described by means of jointed girder elements or more complex elements as for pipings: bended pipes, right angle elbows, tees, or any elements whose strength parameters are given to TEDEL. TEDEL is also for the dynamic computation of structures, damping included. A TEDEL option is for computing buckling critical load
[fr]
L'objet du programme TEDEL est le calcul elastique ou plastique des tuyauteries et charpentes a 3 dimensions. Les structures sont decrites a l'aide d'assemblages d'elements de poutre, ou d'elements plus sophistiques dans le cas des tuyauteries tels que tuyaux courbes, coudes a 90 deg, tes, ou meme d'elements quelconques dont les caracteristiques de rigidite sont fournies a TEDEL. TEDEL permet egalement le calcul dynamique des structures, en tenant compte des amortissements. Une option de TEDEL permet de calculer les charges critiques de flambageOriginal Title
Calcul et analyse des structures en mecanique et thermique. Systeme CEASEMT. Programme TEDEL
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20 May 1976; 98 p
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Goldstein, S.; Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Div. d'Etude et de Developpement des Reacteurs1973
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Div. d'Etude et de Developpement des Reacteurs1973
AbstractAbstract
No abstract available
Original Title
Programmes de calcul elastoplastique de structures en usage au Commissariat a l'Energie Atomique
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1973; 28 p; French congress on mechanics; Poitiers, France; 17 Sep 1973
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Millard, D.; Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1985
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1985
AbstractAbstract
[en] In view of their abundance, piping systems are one of the main components in power industries and in particular in nuclear power plants. They must be designed for normal as well as faulted conditions, for safety requirements. The prediction of the dynamic behaviour of the free pipe requires accounting for several nonlinearities. For this purpose, a beam type finite element program (TEDEL) has been used. The aim of this paper is to enlight the main features of this program, when applied to pipe whip analysis. An example of application to a real case will also be presented
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Feb 1985; 17 p; Conference on pipework design and operation; London (UK); 19-20 Feb 1985; 22 refs.
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Gontier, C.; Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1984
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France)1984
AbstractAbstract
[en] The study was carried out on a simple model made of a one bar with two hinges. This model is subjected to an axial force combined with cyclic thermal loading. The plastic hardening of the hinges has been taken into account, and the convergence of the process, while cycling, has been studied. When the thermal load is too high, ''progressive buckling'' occurs. Diagrams defining the safe domain are presented
[fr]
Cette etude s'inspire d'un travail de J. DEVOS (NOVATOME) concernant le flambage d'une tige a deux rotules sous un chargement axial combine avec un chargement thermique cyclique. Mais ici, le modele est developpe en tenant compte de l'ecrouissage des rotules, et en etudiant la convergence du processus au cours du cyclage. L'etude fait apparaitre la realite du ''flambage progressif'' pour des valeurs trop elevees de la charge thermique. Une condition de non ruine est proposee et presentee sous forme d'abaquesOriginal Title
Stabilite des coques minces. Flambage d'une poutre par cumul de deformation plastique sous l'effet d'un chargement thermique cyclique. Etude d'un modele simplifie
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1984; 73 p
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Report
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ALLOYS, AUSTENITIC STEELS, CARBON ADDITIONS, CHROMIUM ALLOYS, CHROMIUM-NICKEL STEELS, CORROSION RESISTANT ALLOYS, HARDENING, HEAT RESISTING ALLOYS, HIGH ALLOY STEELS, IRON ALLOYS, IRON BASE ALLOYS, LOW CARBON-HIGH ALLOY STEELS, MECHANICAL PROPERTIES, MOLYBDENUM ALLOYS, NICKEL ALLOYS, STAINLESS STEELS, STEELS, STRESSES
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Millard, A.; Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1981
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1981
AbstractAbstract
[en] A finite element for inelastic piping analysis has been presented, which enables accounting for local effects like thermal gradients and supplies local states of stresses and strains, while keeping all the advantages of a classical beam type program (easy to use, simple boundary conditions, cost effectiveness). Thanks to the local description of the cross section, geometrical non-linearity due to inertia modification can be introduced together with material non-linearity. The element can also be degenerated into a straight pipe element
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Aug 1981; 14 p; 6. International conference on structural mechanics in reactor technology (6. SMIRT); Paris, France; 17 - 21 Aug 1981
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Roche, R.L.; Hoffmann, A.
Specialists meeting on high temperature structural design technology of LMFBRs, Champion, Pennsylvania, U.S.A., April 27-30, 1976. Summary report1976
Specialists meeting on high temperature structural design technology of LMFBRs, Champion, Pennsylvania, U.S.A., April 27-30, 1976. Summary report1976
AbstractAbstract
[en] The principle and the simple formulation of a beam type method for inelastic piping flexibility analysis is outlined
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria). International Working Group on Fast Reactors; p. 70-74; Oct 1976; p. 70-74; Specialists meeting on high temperature structural design technology of LMFBRs; Champion, Pennsylvania, U.S.A; 27 - 30 Apr 1976
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Zellner, R.; Hoffmann, A.
Goettingen Univ. (Germany). Inst. fuer Physikalische Chemie. Funding organisation: Bundesministerium fuer Forschung und Technologie, Bonn (Germany)1992
Goettingen Univ. (Germany). Inst. fuer Physikalische Chemie. Funding organisation: Bundesministerium fuer Forschung und Technologie, Bonn (Germany)1992
AbstractAbstract
[en] The oxidation of hydrocarbons in the troposphere under NOx rich conditions is associated with ozone formation via conversion of NO to NO2 in reactions with HO2/RO2 in the subsequent photolysis of NO2. The extent of NO/NO2 conversion is hydrocarbon specific and changes with i.e. chain length in the case of n-alkanes. In the present project a laser spectrometric techniques has been developed which allows the direct determination of NO/NO2 conversion by measurements of OH and NO2 growth in the oxidation of individual hydrocarbons. This technique has been applied to all n-alkanes up to n-hexane. It is found that for the simplest alkanes (CH4, C2H6, C3H8) ΔNO2/Δh.c. equals 2.0. For all larger alkanes ΔNO2/Δh.c. increases. These results provide the basis for the derivation of parameterized, lumped mechanistic expressions for the description of ozone formation in chemical/dynamical modells as well as the delineation of ozone formation potentials of individual hydrocarbons. (orig.). 19 refs
[de]
Die Oxidation von Kohlenwasserstoffen (KW's) unter NOx-reichen Bedingungen der Troposphaere fuehrt zur Bildung von Ozon aufgrund der Konversion von NO zu NO2 durch HO2/RO2-Radikalen und die nachfolgende Photolyse von NO2. Das Ausmass der NO/NO2-Konversion ist kohlenwasserstoffspezifisch und aendert sich z.B. bei n-Alkanen mit der Kettenlaenge. In dem vorliegenden F+E Vorhaben wurden eine laserspektrometrische Methode entwickelt, die es erlaubt, das Ausmass der NO/NO2-Konversion fuer einzelne Kohlenwasserstoffe durch Messung von OH und NO2 direkt zu bestimmen. Die Methode wurde auf C1-C6-n-Alkane angewandt. Fuer die einfachsten Alkane (CH4, C2H6, C3H8) betraegt ΔNO2/ΔKW=2.0. Fuer alle hoeheren KW steigt ΔNO2/δKW an. Die Ergebnisse erlauben die Herleitung von parametrisierten, gekuerzten Mechanismen fuer die Beschreibung der O3-Bildung in Modellrechnungen und die Herleitung von Ozonbildungspotentialen. (orig.)Original Title
Direkte Untersuchungen der HOx- und NO2-Bildung in der Oxidation sauerstoffhaltiger Kohlenwasserstoffradikale unter troposphaerischen Bedingungen
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Sep 1992; 56 p; FOERDERKENNZEICHEN BMFT 07EU707; Available from TIB Hannover: F93B923+a
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Miscellaneous
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Roche, R.L.; Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1976
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1976
AbstractAbstract
No abstract available
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1976; 4 p; 2. Symposium on computers structural analysis and design; Washington, USA; 29 Mar 1976; Published in summary form only.
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Roche, R.; Hoffmann, A.
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1977
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. des Etudes Mecaniques et Thermiques1977
AbstractAbstract
[en] Two different global models are used in the CEASEMT system for structural analysis, one for the shells analysis and the other for piping analysis (in plastic or creep field). In shell analysis the generalized stresses choosed are the membrane forces Nsub(ij) and bending (including torsion) moments Msub(ij). There is only one yield condition for a normal (to the middle surface) and no integration along the thickness is required. In piping analysis, the choice of generalized stresses is: bending moments, torsional moments, Hoop stress and tension stress. There is only a set of stresses for a cross section and non integration over the cross section area is needed. Connected strains are axis curvature, torsion, uniform strains. The definition of the yield surface is the most important item. A practical way is to use a diagonal quadratic fonction of the stress components. But the coefficients are depending of the shape of the pipe element, especially for curved segments. Indications will be given on the yield fonctions used. Some examples of applications in structural analysis are added to the text
[fr]
Deux modeles globaux differents ont ete utilises dans le systeme CEASEMT pour l'analyse des structures, l'un pour l'analyse des coques et l'autre pour l'analyse des tuyauteries (plasticite ou fluage). Dans l'analyse des coques, les contraintes generalisees choisies sont les contraintes de membrane Nsub(ij), les moments de flexion (incluant la torsion) Msub(ij). Il y a seulement une condition pour une normale (a la surface moyenne) et pas d'integration pour l'epaisseur. Dans l'analyse des tuyauteries, le choix des contraintes generalisees est: moments de flexion, moments de torsion, la contrainte de Hoop et la contrainte en tension. Il y a seulement une serie de contraintes pour la section et pas d'integration sur la surface de la section. Les deformations par contraintes sont la courbure axiale, la torsion et les deformations uniformes. La definition de la 'yield surface' est tres importante. Un moyen pratique est d'utiliser une fonction quadratique diagonale des composants de la contrainte. Mais les coefficients dependent de la forme des elements de tuyauterie, en particulier pour les segments courbes. Des indications sont donnees sur les 'yield fonctions' utilisees. Quelques applications d'analyse de structures sont donnees dans ce texteOriginal Title
Modeles plastiques globaux pour analyse de structures sur ordinateur
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1977; 13 p; 4. International conference on structural mechanics in reactor engineering; San Francisco, Calif., USA; 15 - 19 Aug 1977
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