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  • 1975-1979  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 11 (1975), S. 897-914 
    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 L'influence de la fermeture de la fissure et de l'écoulement élastoplastique sur le comportement à la flexion de tôles minces fissurées, est étudiée en faisant appel à un programme de calcul par éléments finis de la flexion incrémentielle de la tôle en régime élastoplastique. Le programme d'éléments finis a été développé en recourant à des hypothèses satisfaisant la théorie des plaques du quatrième ordre de Kirchhoff; les propriétés mécaniques considérées pour le matériau permettent, par ailleurs, de considérer un écrouissage général isotrope, avec réactions élastiques locales lors du déchargement. Cette technique a été appliquée au problème d'une grande tôle circulaire traversée en son centre par une fissure et soumise à flexion pure en son pourtour. On établit la comparaison de deux cas types du problème de flexion: le premier, où l'on néglige la possibilité d'interférence des faces de la fissure avec le moment de flexion, et le second, où l'on introduit un obstacle cinématique au passage de la fissure au travers du plan de symétrie. Les résultats rapportés isolent les effets de l'écoulement élastoplastique et de la fermeture de la fissure.
    Notes: Abstract The influence of crack closure and elasto-plastic flow on the bending behavior of thin cracked plates is investigated through use of an incremental elasto-plastic plate bending finite element computer program. The finite element program was developed using assumptions consistent with Kirchhoff fourth order plate theory while the material property treatment permits general isotropic work hardening with local elastic unloading. This technique is applied to the problem of a large centrally through cracked plate subject to remote circular bending. Comparison is drawn between two cases of the bending problem. The first neglects the possibility of crack face interference with bending, and the second includes a kinematic prohibition against the crack face from passing through the symmetry plane. Results are reported which isolate the effects of elasto-plastic flow and crack closure.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 17 (1979), S. 365-370 
    ISSN: 1741-0444
    Keywords: Fluorophotometer ; Ophthalmology ; Tear turnover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The use of fluorescein dye for the study of ocular dynamics in ophthalmology is briefly reviewed. General principles for designing objective fluorophotometers for measuring the rate of change of fluorescein concentration are discussed. Details of the circuitry and performance of a new improved objective fluorophotometer using a quartz-halogen excitation source and a synchronous detector are presented. In a preliminary clinical trial the mean tear turnover rate for ten normal subjects was found to be 21±13% min−1.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1978-08-01
    Print ISSN: 0022-3735
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Physics
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  • 4
    Publication Date: 2019-06-27
    Description: The influence of crack closure and elastoplastic flow on the bending behavior of thin cracked plates is investigated using an incremental elastoplastic plate bending finite element computer program. The finite element program was developed using assumptions consistent with Kirchhoff fourth-order plate theory while the material property treatment permits general isotropic work hardening with local elastic unloading. This technique is applied to the problem of a large centrally through cracked plate subject to remote circular bending. Comparison is drawn between two cases of the bending problem. The first neglects the possibility of crack face interference with bending, and the second includes a kinematic prohibition against the crack face from passing through the symmetry plane. Results are reported which isolate the effects of elastoplastic flow and crack closure.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture; 11; Dec. 197
    Format: text
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  • 5
    Publication Date: 1975-12-01
    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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