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  • 1980-1984  (9)
  • 1982  (9)
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  • 1980-1984  (9)
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  • 1
    Electronic Resource
    Electronic Resource
    Path-independent integrals in inhomogeneous media (1982)
    Springer
    Archive of applied mechanics 52 (1982), S. 159-166 
    Details
    ISSN: 1432-0681
    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: Übersicht Das Konzept wegunabhängiger Integrale, welches für homogene Medien früher eingeführt wurde, wird für den Fall eines Risses in einer Grenzfläche zwischen zwei verschiedenen Halbebenen erweitert. Durch Verwendung eines der in dieser Arbeit definierten wegunabhängigen Integrale erhalten wir den Spannungsintensitätsfaktor, wenn die Eißlippen durch an beiden Lippen identisch verteilter Spannungen oder Einzelkräfte oder Momente belastet werden. Die oben genannten Integrale sind erweitert, um den Fall einer willkürlichen Zahl von kollinearen Bissen in der Grenzfläche der Halbebenen einzuschließen. Der Fall von periodischen Rissen kann aus dieser Analysis erhalten werden. Schließlich kann eine interessante Verallgemeinerung für den Fall erhalten werden, daß willkürliche Risse, Einschlüsse oder nicht unbedingt an den Rißlippen wirkende Einzelkräfte und Momente in Wechselwirkung stehen.
    Notes: Summary The concept of path independent integrals introduced previously for homogeneous media is extended to the case of a crack in the interface between dissimilar half planes. Using any of the pathindependent integrals defined in this paper we obtain the stress intensity factor when the lips of the crack are loaded by identical distributions of stresses in both lips, or by concentrated forces or couples. The above integrals are extended in order to include the case of an arbitrary number of collinear cracks in the interface of two half planes. The case of periodic cracks may be derived from the above analysis. Finally, an interesting generalization may be obtained for the case where arbitrary cracks, inclusions or concentrated forces and couples, not necessarily applied at the lips of the crack, interact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535309
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  • 2
    Electronic Resource
    Electronic Resource
    The adhesion coefficient of fiber-reinforced polymers evaluated by dynamic measurements (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 837-841 
    Details
    ISSN: 1435-1536
    Keywords: Adhesion coefficient ; composites ; fibers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A theoretical model, consisting of a series of infinite concentric cylinders surrounding a fiber in a composite material, was introduced in this paper to give a quantitative account of interface phenomena, already experimentally observed. A series of specimens, conveniently designed to represent the theoretical model, were subjected to dynamic modes of loading to measure the amount of adhesion between fibers and matrices by means of an adhesion coefficient developed in the theory. It was found that theoretical results for the adhesion between matrix and filler were compatible with the structural characteristics of the specimens tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419093
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  • 3
    Electronic Resource
    Electronic Resource
    The distribution of the elastic strain-energy density at the crack tip for fracture modes I and II (1982)
    Springer
    International journal of fracture 18 (1982), S. 81-112 
    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 L'étude de la distribution de la densité d'énergie de déformation élastique à l'extrémité d'une fissure présente une intéret particulier pour comprendre le mécanisme de la rupture. Dans cette étude, on a développé une analyse théorique exhaustive de la distribution de la densité d'énergie de déformation élastique à l'extrémité d'une fissure dans le cas de fissures situées dans un milieu élastique isotrope déformé selon les models I et II. Cette étude a été complétée par une solution expérimentale de ce type de problème basée sur la méthode des caustiques réfléchies. Selon cette méthode, la distribuiton de la densité d'énergie de déformation élastique est évaluée le long d'une courbe fermée circulaire définissant un noyau singulier autour de l'extrémité de la fissure qui est influencé par la singularité à l'extrémité de la fissure, et dont le diamètre est tres petit et n'excède pas quelques millimètres. Par cette voie, la situation à la singularité de lextrémité de la fissure a été dépeinte directement sur base de la distribution de densité d'énergie. Des résultats intéressants concernant les facteurs qui influencent le mode de distribution d'énergie de déformation au voisinage de la fissure ainsi que du type de chemin de fissuration ont pu être dérivés.
    Notes: Abstract The study of the distribution of the elastic-strain energy density at the tip of a crack presents a special interest for the understanding of the mechanism of fracture. In this investigation an exhaustive theoretical analysis of the distribution of the elastic-strain energy density at the tip of a crack for cracks in isotropic elastic media deformed under modes I and II was developed. This study was complemented by an experimental solution of this type of problem, based on the method of reflected caustics. According to this method the distribution of the elastic-strain energy density was evaluated along a circular closed curve, defining the singular core around the crack-tip, which was dominated by the singularity at the crack tip and whose diameter is very small, not exceeding a few millimeters. In this way the situation at the crack-tip singularity was directly depicted on the energy density distribution. Interesting results concerning the factors influencing the mode of the strain energy distribution around the crack and the type of the crack path were derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019635
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  • 4
    Electronic Resource
    Electronic Resource
    A new concept of path-independent integrals for plane elasticity (1982)
    Springer
    Journal of elasticity 12 (1982), S. 265-280 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Resumé On présente une méthode générale de construction d'intégrales indépendantes du contour dans l'élasticité plane. Les intégrales independantes du contour, proposées dans cet article, sont valables non seulement dans le cas d'une seule fissure mais aussi dans le cas d'un nombre arbitraire de fissures collineaires. Les intégrands de cas intégrales sont classifiés en trois classes, qui satisfont des restrictions bien-definies. De cette façon, il est possible de construire un nombre important de nouvelles integrales indépendentes du contour. Afin d'illustrer la méthode, un certain nombre d'intégrales est appliqué pour un calcul théorique du facteur d'intensité des contraintes de cinq cas des plaques fissurées.
    Notes: Abstract A general method to construct path-independent integrals in the framework of plane elasticity is presented. The proposed path-independent integrals are valid not only for the case of a single straight crack, but also for the case of any number of collinear cracks. The integrands of these integrals are classified in three classes, which satisfy some well-defined restrictions. Therefore, it is possible to construct a large number of new path-independent integrals. As an illustration some of them are derived and are applied to the theoretical computation of the stress intensity factor in five particular cases of cracked elastic plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054958
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  • 5
    Electronic Resource
    Electronic Resource
    The T-criterion applied to ductile fracture (1982)
    Springer
    International journal of fracture 20 (1982), S. R125 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01130617
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of biaxiality of loading on the form of caustics in cracked plates (1982)
    Springer
    Acta mechanica 44 (1982), S. 201-222 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The optical method of reflected caustics was applied up-to-now to problems of cracked plates under uniaxial loading. Only the problem of the biaxial tension of the plate has been considered for the particular case where the crack is transverse to the longitudinal axis of the plate which coincided with the loading axis. In this paper the influence of a biaxial loading of the plate on the form and orientation of the caustic was studied in connection with the orientation of the crack. New modified relations were given for the evaluation of the complex stress intensity factorK=K I −iK II in terms of the angle ϕ of the angular displacement of the caustic axis. For the accurate evaluation ofK I andK II nomograms of correction factorsδ y′ max ,δ x′ max andδ x′ max were given in terms of the angle of inclination of the crack ω=(90−β) and the biaxiality factork. Experimental evidence with PMMA internally cracked plates corroborated the results of theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303338
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  • 7
    Electronic Resource
    Electronic Resource
    A combined integral-equation and photoelastic method for solving contact problems (1982)
    Springer
    Acta mechanica 45 (1982), S. 215-231 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The relation for the difference of principal stresses expressed in terms of Muskhelishvili's complex potential was transformed to an integral equation for the case of a half-plane in contact. Two methods for the numerical solution of the integral equation were developed and a study for the appropriate selection of the collocation points was made. The existence of a solution of the equation and the possibility of applying an iterative process was shown. As an example, the method was succesfully applied for solving the problem of a half-plane loaded by either a uniform, or a parabolic, distribution of forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178041
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamic interaction of collinear cracks (1982)
    Springer
    Acta mechanica 43 (1982), S. 243-260 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The method of caustics was used to investigate the dynamic problem of interaction of two collinear edge cracks in plane PMMA specimens. By varying the externally applied strain rate and the initial crack lengths, useful conclusions were derived on the instability of interacting cracks, their paths of propagation, the variation of the crack propagation velocities and the stress intensity factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176285
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  • 9
    Electronic Resource
    Electronic Resource
    Glass-transition behavior of particle composites modeled on the concept of interphase (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 3019-3025 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The thermomechanical behavior of particle composites was investigated in their transition region. In particular, the value of the glass-transition temperature Tg, which constitutes an upper limit for the structurally important glassy region, was examined. According to experimental evidence existing in the literature the introduction of a reinforcing filler in a polymeric matrix causes Tg of the latter to increase, unless mechanical imperfections counterbalance the reinforcing effect or even produce a Tg for the composite which is lower than that of the matrix. Based on mechanical theories, valid for the mechanical moduli of viscoelastic particle composites, a model was introduced that explains why the glass transition of composite materials may be reduced in some cases, whereas it may be increased in others. The concept of interphase between inclusions and matrix was used for the development of the model. Interphase is assumed to be a region, which is created between the matrix material and the filler particles, both considered as homogeneous and isotropic, whose thermomechanical properties and volume fraction may be determined from the overall thermomechanical behavior of the composite.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270825
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