Abstract
The theory of crack growth developed in Parts I and II is used to predict crack velocity and failure time for an elastomer under simple uniaxial and biaxial stress states. Included are consideration of the effect of specimen size on failure time for initially small cracks, experimental determination of fracture properties, the effect of strain level on crack propagation, and the validity of the plane strain assumption. The second half of the paper examines the effect upon crack velocity of nonlinear viscoelasticity of failing material at the crack tip in media which is otherwise linearly viscoelastic. The dependence of fracture behavior on environmental changes and aging is also considered.
Résumé
On utilise la théorie de croissance de la fissure développée dans les parties I et II pour réduire la vitesse de fissuration et le temps de rupture d'un élastomére soumis à des états de contraintes uniaxiales et biaxiales. Le mémoire comporte des considérations sur l'effet de la dimension des éprouvettes sur le temps de rupture au départ de petites fissures, la détermination expérimentale des propriétés de la rupture, l'étude de l'effet du niveau de déformation sur la propagation des fissures, et de la validité d'hypothèses d'état plan de déformation.
La seconde partie de l'article comporte l'examen de l'effet d'une viscoélasticité non linéaire dans la matière qui se rompt à la pointe d'une fissure, laquelle est par ailleurs sise dans un milieu caractérisé par une viscoélasticité linéaire.
On considère également la manière dont le comportement à la rupture dépend du vieillissement et des changements de l'environnement.
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References
R. A. Schapery, Int. J. Fracture, 11 (1975) 141–159.
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Parts I and II are published, respectively, in Vol. 11, No. 1 (1975) 141–159, and Vol. 11, No. 3 (1975) 369–388.
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Schapery, R.A. A theory of crack initiation and growth in viscoelastic media. Int J Fract 11, 549–562 (1975). https://doi.org/10.1007/BF00116363
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DOI: https://doi.org/10.1007/BF00116363