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  • 1
    Electronic Resource
    Electronic Resource
    On the stress singularity at an interface crack (1980)
    Springer
    International journal of fracture 16 (1980), S. 111-119 
    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 Le champ de contrainte plane élastostatique au voisinage d'une fissure d'interface est prise en considération, et on développe un modéle pour l'extrémité de la fissure d'interface qui ne dépend pas de l'interpénétration des bords de la fissure telle qu'on l'avait envisagée dans des études précédentes, mais qui permet une propagation selon un mode d'ouverture de fissure le long ou au voisinage de cet interface. La base du modèle consiste à prendre comme configuration à laquelle les charges sont appliquées une extémité de fissure sous-tendant un angle d'ouverture. Au moyen d'une “eigen-analysis” asymptotique, les caractéristiques principales de cette déviation des normes de la mécanique de rupture linéaire élastique sont identifiées, et quelques exemples sont présentés qui démontrent son utilité potentielle.
    Notes: Abstract The plane elastostatic stress field near an interface crack is considered and a model developed for the interface crack tip which is free from the inter-penetration of the crack flanks present in some earlier investigations, yet permits propagation in a crack opening mode along or near the interface. The basis of the model lies in taking, as the configuration to which the loads are applied, a crack tip which subtends an opening angle. By means of an asymptotic eigen-analysis, the main features of this departure from the norm in LEFM are identified and some examples presented which demonstrates its potential usefulness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012616
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  • 2
    Electronic Resource
    Electronic Resource
    On the effects of scaling on the Paris law (1994)
    Springer
    International journal of fracture 68 (1994), S. R3 
    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/BF00032330
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  • 3
    Electronic Resource
    Electronic Resource
    The size dependence of fracture toughness for two embrittled materials (1985)
    Springer
    International journal of fracture 72 (1985), S. R3 
    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/BF00036931
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of crack-flank displacement fitting for estimating K with a path independent integral (1993)
    Springer
    International journal of fracture 70 (1993), S. 237-251 
    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 Predicting crack growth under cyclic loading in applications usually requires the efficient extraction of stress intensity factors from finite element analyses of mixed mode situations. Two approaches to this end are examined: one, a competitive fitting procedure using crack-flank displacement data, the other, a path independent integral which can readily distinguish between modes. A protocol is established for comparing the two on a set of about forty test problems which have exact solutions. Analysis is via quarter point elements on a common sequence of three successively refined meshes for each problem. Results show that the path independent integral is more consistently accurate and reliably convergent, yet comparable in implementation effort.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012937
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  • 5
    Electronic Resource
    Electronic Resource
    On the stress singularities in the plane elasticity of the composite wedge (1979)
    Springer
    Journal of elasticity 9 (1979), S. 373-391 
    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: Résumé Ce papier examine le coin composé, linéaire et élastique, en deux dimensions, pour déterminer les contraintes singulières à son sommet. On va considérer la rangée totale des conditions aux limites du coin, et les conditions correspondantes dans le coin. On se sert de la séparation des variables de la fonction de contrainte d'Airy, pour déterminer les conditions usuelles sur le déterminant pour les singularités de la formeO(r -λ) quandr → 0, et on dérive des conditions additionnelles pour les singularités de la formeO(r -λ lnr) quandr → 0. L'ordre du déterminant impliqué dans ces conditions dépend du nombre des matériaux dans le coin. D'abord on propose deux méthodes systématiques de développer le déterminant du coin deN-matériaux.
    Notes: Abstract This paper examines the composite, two-dimensional, linear elastic wedge for singular stresses at its vertex. A full range of wedge boundary and matching conditions is considered. Using separation of variables on the Airy stress function, the usual determinant conditions for singularities of the formO(r -λ) asr → 0 are established and further conditions are derived for singularities of the formO(r -λ lnr) asr → 0. The order of the determinant involved in these conditions depends upon the number of materials comprising the wedge. Two systematic methods of expanding the determinant for theN-material wedge are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044615
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  • 6
    Electronic Resource
    Electronic Resource
    On the planar crack of arbitrary shape at the interface of two anisotropic elastic half-spaces (1984)
    Springer
    International journal of fracture 25 (1984), S. R11 
    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/BF01152754
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  • 7
    Electronic Resource
    Electronic Resource
    On the implications for LEFM of the three-dimensional aspects in some crack/surface intersection problems (1984)
    Springer
    International journal of fracture 25 (1984), S. 3-32 
    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 On étudie diverses configurations élastiques comportant des fissures coupant une surface libre et soumises à tension transversale. Deux méthodes numériques indépendantes sont utilisées à titre comparatif sur un problème en vue d'obtenir des résultats fiables, chaque méthode étant adaptée en vue de tenir compte des caractéristiques spécifiques au problème. Cette comparaison donne confiance dans d'autres résultats qui se basent sur un paramètre clé de la mécanique de rupture linéaire et élastique, le taux de relaxation de l'énergie. On peut résumer les conclusions de l'étude comme suit. Le fait que l'on trouve une atténuation du taux de relaxation de l'énergie au für et à mesure qu'on se rapproche d'une surface libre n'a probablement pas, dans les divers problèmes traités, de signification du point de vue de l'essai de ténacité à la rupture, et n'a pas d'influence majeure sur le calcul de la vie en fatigue, bien que certaines indications laissent appréhender que ce n'est pas le cas si sont présents au voisinage de la surface des champs de contrainte résiduelle. En outre, ces variations dans le taux de relaxation de l'énergie peuvent être compensées par des perturbations relativement mineures dans le profil du front de fissure.
    Notes: Abstract Several elastic configurations containing cracks under transverse tension which intersect a free surface are investigated. In order to ensure reliable results two independent numerical methods are employed on a comparison problem, each method being tuned to handle the special features involved. The comparison provides confidence in other results which focus on the key quantity in linear elastic fracture mechanics, the energy release rate. These findings may be summarized as follows: that the decays in the energy release rates found as the free surface is approached in the various problems treated are probably not significant from a fracture toughness testing point of view and not of major consequence in cyclic life calculations, although there are some indications that this may not be the case if near-surface residual stress fields are present; and that these variations in energy release rate can be compensated for by relatively minor perturbations in crack-front profiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01152747
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  • 8
    Electronic Resource
    Electronic Resource
    Some inherently unreliable practices in present day fracture mechanics (1985)
    Springer
    International journal of fracture 28 (1985), S. 3-16 
    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 examine diverses pratiques courantes en Mécanique de Rupture qui font usage de grandeurs paramétriques au voisinage de l'extrémité d'une fissure pour tirer des conclusions sur ce qui se passe à cette extrémité même. Ces grandeurs sont notamment: les valeurs de la contrainte et du déplacement correspondant à un facteur d'intensité de contrainte estimé, l'enregistrement des contraintes et déplacements locaux en vue de prédire la rupture, et l'angle et le déplacement d'ouverture d'une fissure en tant que critères de rupture. En considérant une paire d'applications divergentes, on démontre que toutes ces procédures risquent d'entraîner des conclusions complètement incorrectes. Une analyse des causes de ces inadéquations montre que ces procédures peuvent se révéler peu fiables en général, et conduit à des suggestions de procédures alternatives.
    Notes: Abstract A number of current practices in fracture mechanics which use quantities near a crack tip to make conclusions about response at the crack tip itself are examined. Specifically these include: stress and displacement matching to estimate stress intensity factors, monitoring local stress and strain values to predict fracture, and both crack opening angle and crack opening displacement as fracture criteria. By means of a pair of counter applications, all of these procedures are demonstrated to have the potential of leading to completely incorrect conclusions. An understanding of what causes this inadequate performance then indicates that such procedures may be unreliable in general and prompts suggestions as to alternatives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033698
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  • 9
    Electronic Resource
    Electronic Resource
    On the variability of fracture toughness (1993)
    Springer
    International journal of fracture 60 (1993), S. R43 
    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/BF00012516
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  • 10
    Electronic Resource
    Electronic Resource
    On the fundamental energy argument of elastic fracture mechanics (1986)
    Springer
    International journal of fracture 74 (1986), S. 43-61 
    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 Energy arguments remain, even today, as probably the most fundamental physically-reasoned justification for the application of linear elastic fracture mechanics to brittle materials. Accordingly, they have attracted and continue to attract quite a number of investigations. Not all of these studies employ the same approach. Unfortunately, nor do they all lead to the same conclusions regarding the implications of elastic fracture mechanics. Here, by examining the energy balance of fracture mechanics from a classical physics viewpoint, equivalent valid approaches are identified. This in turn enables the various contributions over the years to be placed in perspective with respect to whether or not they are correct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018574
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