ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Artikel  (1.086)
  • 1980-1984  (1.086)
  • 1982  (1.086)
  • Maschinenbau  (1.033)
  • Pädagogik  (53)
Sammlung
  • Artikel  (1.086)
Datenquelle
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1980-1984  (1.086)
Jahr
Zeitschrift
Thema
  • 1
    Digitale Medien
    Digitale Medien
    Rapid rotation of a heavy gyrostat about a fixed point in a resisting medium (1982)
    Springer
    International applied mechanics 18 (1982), S. 660-665 
    Details
    ISSN: 1573-8582
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886270
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    THE EFFECT OF CYCLE WAVESHAPE ON THE LOW CYCLE FATIGUE BEHAVIOUR OF 20%Cr–25%Ni–Nb STAINLESS STEEL AT 650°C (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 5 (1982), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Abstract— Low cycle fatigue tests at 650°C on 20% Cr–25% Ni–Nb stainless steel have been carried out under conditions of equal tension/compression ramp rates (10−3 s−1) and slow tension–fast compression ramp rates (10−6 s−1/10−3 s−1). It was found that the latter cycle significantly reduced endurance. Detailed metallography revealed that life reduction is due to the accumulation of creep damage during the slow tensile ramp. It is proposed that at high strain ranges, failure is creep dominated and this changes to a creep-fatigue interaction failure mechanism at low strain ranges.Predictive models have been developed based on cavity growth mechanisms and ductility exhaustion. Both techniques provide an accurate life prediction and only limited data are required to use them.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1982.tb01236.x
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    The shape, size and flow behaviors of micelle forming various synthetic tannin materials in aqueous solutions (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 702-707 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Syntans micelles ; Shape ; Size and flow ; Correlation times ; Hydrodynamic & optical studies ; Viscosity equations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The results of viscometric and optical microscopic studies indicated that both Syntan 25 and Syntan PUR in aqueous concentrated solutions (above their c.m.c. values) at 25 °C are spherical in shape. The size and other physico-chemical parameters e. g. Volumes of the aggregated particleM v, Radius of gyrationR g, Hydrodynamic radius ¯R h, Diffusion coefficient ¯D, and the Correlation times for aggregate rotationT r Translational diffusionT D and effective aggregation timeT a have been derived on the basis of microscopic results. The viscosity data for both Syntan 25 and Syntan PUR were analysed in terms of Einstein equation, Moulik equation, Jones-Dole equation. It has been shown that Syntan PUR was more highly hydrated than that of Syntan 25 although the intrinsic viscosity [η], of Syntan PUR is nearly 1.5 times greater than that of Syntan 25. The Flory-Huggins equation and Thomas equation has been compared in both the Syntans and it has been concluded that the Thomas' constantk 1 may be 12.50 for perfect spherical shape of the particle instead of 10.05 (which has originally been proposed by Thomas).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01414657
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Carburization kinetics of heat-resistant steels (1982)
    Springer
    Oxidation of metals 18 (1982), S. 229-243 
    Details
    ISSN: 1573-4889
    Schlagwort(e): Austenitic steels ; carburization ; carbon diffusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A series of 21 commercial austenitic heat-resistant alloys was carburized in H2-C3H6 atmospheres which were reducing to Cr2O3 and SiO2 and which provided a carbon activity of one. Reactions were carried out at 900⩽T⩽1100°C and the resulting depth of carburization was measured metallographically. All alloys showed parabolic carburization kinetics after an initial brief period, at low temperatures, of more rapid reaction. The apparent activation energies for carburization are discussed in terms of carbon solubilities and diffusion coefficients. It is concluded that Wagner's theory of internal oxidation is quantitatively applicable to simple alloys but not to alloys which contain additions of reactive elements. The effectiveness of additions of niobium, aluminum, titanium, and silicon is demonstrated and is discussed in the context of Wagner's theory.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656570
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Oxidation of nickel-manganese alloys in the temperature range 873–1273 K (1982)
    Springer
    Oxidation of metals 18 (1982), S. 295-314 
    Details
    ISSN: 1573-4889
    Schlagwort(e): Nickel-manganese alloys ; oxidation ; solid solution scales ; internal oxidation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Ni-Mn alloys containing up to 38% Mn have been oxidized in pure oxygen between 873 and 1273 K and the parabolic rate constants measured. The scale morphologies and oxide compositions are interpreted in terms of modifications to the scale on pure Mn caused by the presence of Ni. The scales are composed predominantly of two layers at all temperatures, giving the sequences of phases alloy/cubic monoxide (Ni, Mn)O/ternary spinel, with the cubic (Ni, Mn)O layer always having the greater thickness. There is limited evidence for a third, very thin, outer layer in the scales on all alloys at 873 K and for Ni-38%Mn at 1073 K, which is tentatively considered to be Mn2O3, giving layers in the order alloy/cubic monoxide/ternary spinel/Mn2O3, by analogy with the scale formed on pure Mn. The distribution of the alloy components in the scale is discussed in relation to the Ni-Mn-O phase diagram and in terms of recent theoretical treatments of solid solution scale formation on binary alloys, as far as the available diffusion data allow. The occurrence of internal and intergranular oxidation and the formation of a Mn-depleted zone coincident with the band of uniform internal oxide are considered briefly.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656573
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    The morphological and structural development of internal oxides in nickel-aluminum alloys at high temperatures (1982)
    Springer
    Oxidation of metals 18 (1982), S. 127-146 
    Details
    ISSN: 1573-4889
    Schlagwort(e): Internal oxidation ; nickel-aluminum alloys
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The formation and development of internal oxides in Ni-Al alloys containing 1–4 wt.% Al in Ni-NiO packs and in 1 atm oxygen at 800 to 1100°C have been studied. The internal oxide particles were relatively fine, closely spaced, and mainly acicular, although more granular near the surface. They were identified as Al2O3 at the advancing front, but NiAl2O4 at the surface and at a significant distance from that surface. Growth of internal oxide particles resulted in the development of significant compressive stresses in the internal oxide zone when formed in Ni-NiO packs. These stresses led to grainboundary sliding at the higher temperatures and extrusion of weak, internal oxide-denuded zones adjacent to alloy grain boundaries. At the lower temperatures, these stresses also resulted in significant preferential penetration of oxides down grain boundaries and sub-grain boundaries. Stress development and resulting phenomena were much less significant during oxidation in 1 atm oxygen because vacancies injected from the external NiO scale accommodated the volume increase during growth of internal oxide particles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00662034
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    An investigation of stress intensity factors for plates with equal and unequal parallel edge cracks (1982)
    Springer
    International journal of fracture 20 (1982), S. 223-239 
    Details
    ISSN: 1573-2673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Résumé On utilise une méthode semi-théorique et expérimentale pour étudier le comportement de tôles minces comportant des fissures de bord parallèles de longeurs égales et inégales et soumises en traction. Des tôles comportant des fissures de bord périodiquement égales et inégales et parallèles sont traitées suivant deux cas distincts: variation de la longeur de la fissure et variation de l'espacement entre les fissures. Les observations expérimentales montrent que, dans les tôles où la largeur de l'éprouvette est beaucoup plus grande que la longuer des fissures, le facteur d'intensité de contrainte est en accord avec celui que l'on trouve dans le cas de fissures de bord égales et parallèles dans des tôles semi-infinies. Toutefois, lorsque le rapport de la longeur de fissure à la largeur de l'éprouvette n'est plus petit, le facteur d'intensité de contrainte s'écarte considérablement de celui relatif à des tôles semi-infinies. En outre, dans le cas de fissures de bord parallèles de périodes inégales, la dimension de la caustique corespondant aux fissures les plus courtes devient très faible (elle ne peut plus guère être observée et mesurée) losque la différence de profondeur entre la fissure la plus grande et la fissure la plus courte devient supérieure à la moitié de l'espacement entre les fissures.[/ p]
    Notizen: Abstract A semi-theoretical and experimental method is used to investigate thin plates with parallel edge cracks of equal and unequal length loaded in tension. Plates with equal and unequal periodic parallel edge cracks are treated under two separate cases: a. varying the length of the crack, and b. varying the crack spacing. Experimental observations show that in plates where the width of the specimen is much larger than the length of the cracks the stress intensity factor is in agreement with that of equal parallel edge cracks of semi-infinite plates. However, when the ratio of the length of the crack to the width of the specimen is no longer small, the stress intensity factor deviates considerably from that of the semi-infinite plates. Furthermore, in the case of unequal periodic parallel edge cracks, the size of the caustic of the shorter crack becomes very small (it cannot be observed and measured) when the difference in the depth of the larger and short crack becomes equal or greater than one half of the crack spacing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01140337
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Development of preferential intergranular oxides in nickel-aluminum alloys at high temperatures (1982)
    Springer
    Oxidation of metals 18 (1982), S. 93-113 
    Details
    ISSN: 1573-4889
    Schlagwort(e): Intergranular oxidation ; nickel-aluminum alloys ; internal oxidation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The development of intergranular oxides in dilute Ni-Al alloys containing 0.55–4.10% Al in Ni-NiO packs and in 1 atm oxygen at 800–1100°C has been examined. In the Ni-NiO packs, preferential intergranular oxide penetration as well as internal oxidation occurs in every case, except in the higher aluminum-containing alloys at 1100°C. Several different types of intergranular oxide morphology were observed, depending on alloy aluminum concentration and on temperature. The oxides in the more dilute alloys are thin and relatively continuous and are accompanied by preferential penetration of internal oxide particles in the adjacent grains. Thicker intergranular oxides are precipitated in the more concentrated alloys while, in some situations, numerous fine oxide particles are formed well ahead of the main intergranular oxide. The intergranular oxidation is facilitated by high stress development in the specimens due to increases in volume as internal and intergranular oxides are formed. These stresses create microvoids in the grain boundaries immediately ahead of the advancing internal and intergranular oxides, resulting in preferential nucleation and growth of further intergranular oxides. This is the case particularly at the lower temperatures where other stress-relief processes cannot operate. The resulting relatively continuous, incoherent intergranular oxide-metal interface allows a high flux of oxygen to the advancing intergranular oxide front. Preferential intergranular oxidation is much less extensive in the presence of a thickening external NiO scale, due to accommodation of the volume increases on internal oxide formation by vacancies injected into the alloy from the growing cationdeficient scale.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00662032
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Dynamics of flow of c-axis sapphire (1982)
    Springer
    Journal of materials science 17 (1982), S. 1977-1987 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The deformation dynamics in uniaxial tension of c-axis sapphire were investigated at temperatures from 1600 to 1850° C in constant strain-rate tests from 0.00007 min−1 to 0.0036 min−1. The activation parameters are consistent with thermally-activated overcoming of the Peierls barrier as the rate-controlling process for flow. From SEM, TEM, and HVTEM examinations of deformed specimens it is deduced that the active slip plane is of the {¯4223}-type. The dislocation structure suggests that the 〈0 ¯110〉 directions are the most likely slip directions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00540414
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    Etching and dissolution kinetics of MoSe2 single crystal (1982)
    Springer
    Journal of materials science 17 (1982), S. 1671-1674 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Etching and dissolution kinetics of MoSe2 single crystals in aqueous chromic acid at different concentrations and temperatures have been studied. The dependence of the etch rate upon the concentration and temperature of the etchant has been established. The mechanism of the process of dissolution has been explained on the basis of an oxidation-reduction process. The process of etching has been found to be purely diffusion controlled.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00540794
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...