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  • 1
    Electronic Resource
    Electronic Resource
    Photoperiod manipulation to control diapause in the pink bollworm,Pectinophora gossypiella (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 1101-1102 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Im 12-h Kurztag gehaltenePectinophora gossypiella gehen zu 78% in Diapause. Zusätzlich applizierte, einstÜndige Perioden mit 15 Lichtpulsen von je 1 min Dauer reduzieren die Diapauserate. Die besten Resultate ergeben 2 Pulsperioden, je 1,5 h vor und nach der Hellphase appliziert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02112699
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  • 2
    Electronic Resource
    Electronic Resource
    An application of finite element techniques to post-yield analysis of proposed standard three-point bend fracture test pieces (1974)
    Springer
    International journal of fracture 10 (1974), S. 17-32 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé En utilisant un programme d'analyse élastique-plastique d'éléments finis, on étudie deux géométries types, recommandées pour les essais de rupture. Une attention particulière a été consacrée à la singularité de la zone avoisinant l'extrémité d'une fissure, qui peut être caractérisée par l'intégrale de Rice, et à ses relations avec le concept du COD suggéré par Wells.
    Abstract: Zusammenfassung In dem man ein elastoplastisches endlicher Elementen Verfahren anwendet werden zwei bekannte Geometrien der Bruchprüfung untersucht. Besonderen Wert wird der eigenartigen Umgebung an der Spitze eines Risses, karakterisiert durch das Integral von Rice, und seine Abhängigkeit von dem COD Begriff von Wells, gegeben.
    Notes: Abstract Making use of an Elastic-Plastic Finite Element Program, two recommended fracture testing geometries are analysed. Special attention is given to the singular environment at a crack tip, characterised by Rice's contour integral, and its relationship with the COD concept suggested by Wells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00955076
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  • 3
    Electronic Resource
    Electronic Resource
    Some applications of elastic-plastic analysis to fracture mechanics (1974)
    Springer
    International journal of fracture 10 (1974), S. 620-620 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The purpose of analysis in fracture mechanics is to determine characterising parameters which reflect the influence of loading and geometry on the crack tip environment of flawed bodies. Here practical methods are developed which permit the determination of such parameters in general situations. Extensive use of finite element methods has been made to provide relevant field values which are then manipulated to determine the required parameters. However the choice of method to determine field values is arbitrary and is dictated by the ease with which such field values may be found. It is in the manipulation of these values that the fracture mechanics philosophy is introduced. Contributions are made in three areas. First economic methods for the determination of the linear fracture mechanics parameter in general stiuations are developed which are of direct relevance to design procedures. Detailed discussion of the Dugdale model of fracture behaviour is then given and a general method for determining Dugdale model solutions is provided. This method is used to provide solutions for standard specimen geometries and it is suggested that such solutions will enable a rational evaluation of the general applicability of the model. However the method is such that, should sufficient confidence in the model be established, design calculations on its premises may be performed. Finally, it is demonstrated that materials which allow extensive plastic flow at a flaw tip prior to fracture may be analysed using the basic ideas of fracture mechanics. It is shown that a line integral provides a flaw tip environment parameter for materials deforming according to the physically appropriate Prandtl-Reuss laws of plasticity. It is hoped that these results will indicate a rational approach to correlating fracture behaviour in such situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155272
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  • 4
    Electronic Resource
    Electronic Resource
    A practical application of Buekner's formulation for determining stress intensity factors for cracked bodies (1972)
    Springer
    International journal of fracture 8 (1972), S. 157-165 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé En recourant à l'expression formulée par Buekner en 1958 et à un programme standard d'analyse des éléments finis, on a développé une méthode précise et efficace pour la détermination des facteurs d'intensité des contraintes dans des solides nantis de fissures arbitraires. La méthode permet de se passer d'interpolations graphiques des données et d'éviter l'introduction d'éléments finis spéciaux à la pointe d'une fissure, ou le recours à des éléments finis détaillés dans les régions au voisinage de celle-ci. Avec une égale facilité, on pent determiner les facteurs d'intensité de contrainte dans le cas d'éprouvettes d'essais, ou la dimension de défauts admissibles dans des elements de construction soumises à des sollicitations.
    Abstract: Zusammenfassung Unter Zuhilfenahme des von Buekner 1958 formulierten Ausdrucks, Bowie mit Hilfe einer Standardanalyse der endlichen Elemente, wurde ein genaues and wirkungsvolles Verfahren zur Bestimmung der Spannungsintensitätsfaktoren in Festkörpern mit beliebigen Rissen entwickelt. Dieses Verfahren erübrigt die Anwendung graphischer Intrapolationen der Angaben und vermeidet das Einführen von speziellen endlichen Elementen an der Rißspitze oder die Zuhilfenahme detaillierter endlicher Elemente in ihrer näheren Umgebung. Mit derselben Leichtigkeit können sowohl die Spannungsintensitätsfaktoren im Falle von Probenstäben als auch die Größe zulässiger Defekte in beanspruchten Bauelementen bestimmt werden.
    Notes: Abstract Making use of Buckner's [1] formulation in conjunction with a standard finite element program an efficient and accurate method of determining stress intensity factors for cracked arbitrary bodies is developed. The method avoids the need for graphical interpolation of data, the introduction of special tip elements or the need for minute elements in the near tip region. Stress intensity factors for test specimens or permissible defect size in load carrying components may be determined with equal facility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703877
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  • 5
    Electronic Resource
    Electronic Resource
    A practical application of Buekner's formulation for determining stress intensity factors for cracked bodies (1972)
    Springer
    International journal of fracture 8 (1972), S. 157-165 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé En recourant à l'expression formulée par Buekner en 1958 et à un programme standard d'analyse des éléments finis, on a développé une méthode précise et efficace pour la détermination des facteurs d'intensité des contraintes dans des solides nantis de fissures arbitraires. La méthode permet de se passer d'interpolations graphiques des données et d'éviter l'introduction d'éléments finis spéciaux à la pointe d'une fissure, ou le recours à des éléments finis détaillés dans les régions au voisinage de celle-ci. Avec une égale facilité, on pent determiner les facteurs d'intensité de contrainte dans le cas d'éprouvettes d'essais, ou la dimension de défauts admissibles dans des elements de construction soumises à des sollicitations.
    Abstract: Zusammenfassung Unter Zuhilfenahme des von Buekner 1958 formulierten Ausdrucks, Bowie mit Hilfe einer Standardanalyse der endlichen Elemente, wurde ein genaues and wirkungsvolles Verfahren zur Bestimmung der Spannungsintensitätsfaktoren in Festkörpern mit beliebigen Rissen entwickelt. Dieses Verfahren erübrigt die Anwendung graphischer Intrapolationen der Angaben und vermeidet das Einführen von speziellen endlichen Elementen an der Rißspitze oder die Zuhilfenahme detaillierter endlicher Elemente in ihrer näheren Umgebung. Mit derselben Leichtigkeit können sowohl die Spannungsintensitätsfaktoren im Falle von Probenstäben als auch die Größe zulässiger Defekte in beanspruchten Bauelementen bestimmt werden.
    Notes: Abstract Making use of Buckner's [1] formulation in conjunction with a standard finite element program an efficient and accurate method of determining stress intensity factors for cracked arbitrary bodies is developed. The method avoids the need for graphical interpolation of data, the introduction of special tip elements or the need for minute elements in the near tip region. Stress intensity factors for test specimens or permissible defect size in load carrying components may be determined with equal facility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189778
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  • 6
    Electronic Resource
    Electronic Resource
    A practical method for determining Dugdale model solutions for cracked bodies of arbitrary shape (1972)
    Springer
    International journal of fracture 8 (1972), S. 239-256 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On propose une méthode pour déterminer les solutions au modèle de Dugdale dans le cas de solides comportant des fissures de forme arbitraire. Cette méthode est basée sur la détermination des facteurs d'intensité de contraintes correspondant à des systèmes de mise en charge combinés, et sur la superposition de ceux-ci de telle sorte que soit éliminé un comportement singulier. On détermine ensuite par les voies habituelles, le COD recherché. Les résultats sont présentés dans cinq cas d'application pratique. La méthode utilisée est directement applicable à des problèmes de caractère général.
    Abstract: Zusammenfassung Es wird ein Verfahren zur Ermittlung der Lösungen des Dugdale-Modells für den Fall von Festkörpern mit Rissen beliebiger Form vorgeschlagen. Dieses Verfahren ist begründet auf eine Bestimmung der Spannungsintensitätsfaktoren für kombinierte Beanspruchungen, welche so überlagert sind, daß ein singulares Verhalten ausgeschlossen ist. Alsdann wird der COD nach den üblichen Verfahren bestimmt. Die Ergebnisse für fünf praktische Fälle werden erörtert. Das angewandte Verfahren ist direkt für die Lösung allgemeiner Probleme anwendbar.
    Notes: Abstract A method is proposed to determine Dugdale model solutions for cracked bodies of arbitrary shape. The method is based on the determination of stress intensity factors for component loading systems and superposing these such that singular behaviour is eliminated. The desired crack opening displacement is then determined trivially. Results are presented for five cases of practical interest and the method is directly applicable to problems of a general nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186123
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  • 7
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    Influence of Row Width and Plant Population on Yield of two Varieties of Corn ( Zea mays L.) 1 (1970)
    Wiley
    Details
    Publication Date: 1970-11-01
    Print ISSN: 0002-1962
    Electronic ISSN: 1435-0645
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 8
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    A practical application of Buekner's formulation for determining stress intensity factors for cracked bodies (1972)
    Springer
    Details
    Publication Date: 1972-06-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 9
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    A practical application of Buekner's formulation for determining stress intensity factors for cracked bodies (1972)
    Springer
    Details
    Publication Date: 1972-06-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
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    Polymorphic phase transformation rates in shock‐loaded potassium chloride (1974)
    American Institute of Physics
    Details
    Publication Date: 1974-03-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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