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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 5 (1969), S. 305-313 
    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 Dans l'ouvrage on a discuté la largeur d'un anneau des déformations plastiques dans une couche d'un matériau élastoplastique avec une zone plastique très mince. Le problème est réduit à une equation intégrale de Fredholm de deuxième ordre, avee la limite supérieure déterminée par la méthode des essais successifs, appliquée sur la base d'une condition, que les contraintes normales ont des valeurs finies. Les formules pour la largeur de la zône plastique ont ététabliés et la répartition des contraintes est discutèe et prèsentée sur les graphiques.
    Abstract: Zusammenfassung Es wurde die Weite eines Ringes einer plastischen Veränderung in einer Schicht von idealem, elastisch-plastischem Material mit einer sehr dünnen plastischen Zone, untersucht. Das Problem verringerte sich zu einer Fredholm Integralgleichung zweiter Ordnung. Die obere Grenze wurde durch eine Versuchs- und Fehlermethode auf den Gebrauchszustand des normalen Druckes bestimmt. Die Formel für die Weite der plastischen Zone wurde gefunden. Die Verteilung der Drucke ist in einem Diagram gezeigt und ihr Verhalten wurde besprochen.
    Notes: Summary The width of the annulus of plastic deformations for a layer of ideally elasto-plastic material with a very thin plastic zone has been discussed. The problem reduces to a Fredholm integral equation of the second kind, with the upper limit to be determined by a trial-and-error method from the condition of finiteness of the normal stress. The expression for the width of plastic zone has been found. The distribution of stresses is given in diagrams and its behavior discussed.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 1969-12-01
    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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  • 3
    Publication Date: 2013-03-27
    Print ISSN: 1930-1855
    Electronic ISSN: 1930-1863
    Topics: Geosciences , Chemistry and Pharmacology
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  • 4
    Publication Date: 2019-07-13
    Description: To improve gas turbine and diesel engine performance using thermal barrier coatings (TBC's) requires an understanding of the factors that influence the in-service behavior of thermal barrier coatings. One of the many factors related to coating performance is the state of stress in the coating. The total stress state is composed of the stresses due to the in-service loading history and the residual stresses. Residual stresses have been shown to affect TBC life, the bond strength of thermal spray coatings, and the fatigue life of tungsten carbide coatings. Residual stresses are first introduced in TBC's by the spraying process due to elevated temperatures during processing and the difference in coefficients of thermal expansion of the top coat, bond coat, and substrate. Later, the residual stresses can be changed by the in-service temperature history due to a number of time and temperature dependent mechanisms, such as oxidation, creep, and sintering. Silica content has also been shown to affect sintering and the cyclic life of thermal barrier coatings. Thus, it is important to understand how the spraying process, the in-service thermal cycles, and the silica content can create and alter residual stresses in thermal barrier coatings.
    Keywords: Nonmetallic Materials
    Type: Paper-2-Vol-1 , Physics and Process Modeling (PPM) and Other Propulsion R and T; 1; NASA-CP-10193-Vol-1
    Format: application/pdf
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