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A review of intergranular fracture processes in creep
490
LITERATURE
AND
CURRENT
EVENTS
Systematic Abstracts of Current
Selected
from Battelle
Technical
Review
VOL. 2
(1958/59)
Literature
1959 and from other sources
I. DEFORMATION AND FRACTURE 1.1.
Fracture
Etat actuel du probkme de la rupture fragile. Present State of the Brittle Fracture Problem. G. M. Boyd. Revue de la Soudure, v. 14, no. 4, 1958, p. 175-187. Study of one of the causes of the ruptures of mild steel structures, due to fatigue, or fatigue and corrosion. Characteristics of brittle fractures, inception, effects of temperature, relationship between strength and resistance, welding and protection.
A Review of Intergranular Fracture Processes in Creep. P. W. Davies and J. P. Dennison. Institute of Metals, Journal, v. 87, pt. 4, Dec. 1958, p, 119.125. Slow deformation of metals at elevated temperatures is known to lead to $he development of intergranular cracks. Both qualitative and quantitative aspects of the theories relating to such internal fissuring are reviewed, and it is shown that different processes become operative according to the prevailing conditions of stress and temperature.
The Markings on Fracture Surfaces. Eugene F. Poncelet. Society of Glass Technology, Journal, v. 42, Dec. 1958, p. r79T-z88T + 8 plates. Fracture surfaces on glasses exhibit characteristic marking which can be interpreted in terms of the author’s theory of propagation of fracture; this theory is summarized briefly and is illustrated by a collection of photographs of various forms of fracture surfaces. On the Strength of Classical Fibres and Fibre Bundles. B. D. Coleman. Journal of the Mechanics and Physics of Solids, v. 7. no. I, Nov. 1958, p. 60-70. Discusses tensile strength distributions for fibres whose strength is independent of the rate of loading. Reasons are presented for expecting that the tensile strength should obey the Weibull distribution. The statistical theory of the strength of bundles of these fibres, as developed by Daniels, is applied to infinite bundles composed of fibres which obey the Weibull distribution. It is found that the ratio
of the tensile strength (units of force at break per initial unit area) of a bundle to the mean tensile strength of the constituent filaments decreases monotonically with increasing dispersion in the strength of the constituent filaments.
Internal Stresses and Fatigue in Metals.* A. M. Freudenthal. Physics Today, v. 12, Feb. 1959, p. 16-19. A symposium on Internal Stresses and Fatigue in Metals was held Sept. x-5, 1958, at the General Motors Research Laboratories. InAted papers were presented by research workers in solid-state physics, metal physics, and engineering from England, France, Germany, and the United States. The singular feature of the conference is the attempt to clarify some of the basic aspects of the two phenomena by considering them in the light of concepts of solid-state physics or physical metallurgy rather than in empirical engineering terms alone, and thus to promote a deeper understanding of the interaction of the phenomena of their metal physics by the “interaction” and engineering aspects. It is surprising to note how rapidly, through this interaction, the extensive progress in metal physics has transformed the engineer’s approach to the properties of the materials he uses, and has provided him with the beginning of that “sense of structure” which Cyril Smith considers to be the characteristic mark of the modern approach to the mechanics of matcrials, as distinct from the conventional or “classical” approach based on the mechanics of the solid isotropic continuum. Some Quantitative Information obtained from the Examination of Fatigue Fracture Surfaces. D. .4. Ryder. Royal Aircraft Establishment (Gt. Brit.) September 1958. 6 pp., diagrs., photos. (Ask for N-69106) Examination of the fracture of a programmed fatigue specimen has demonstrated that the * The Proceedings of this symposium, edited by G. M. Rassweiler and W. I<. Grube, have been published by ElsevierPublishingCo.Amsterdam. 1959, 451 Pp., 280 fig., 9 tables.
LITERATURE
AND
CURRENT
EVENTS
Systematic Abstracts of Current
Selected
from Battelle
Technical
Review
VOL. 2
(1958/59)
Literature
1959 and from other sources
I. DEFORMATION AND FRACTURE 1.1.
Fracture
Etat actuel du probkme de la rupture fragile. Present State of the Brittle Fracture Problem. G. M. Boyd. Revue de la Soudure, v. 14, no. 4, 1958, p. 175-187. Study of one of the causes of the ruptures of mild steel structures, due to fatigue, or fatigue and corrosion. Characteristics of brittle fractures, inception, effects of temperature, relationship between strength and resistance, welding and protection.
A Review of Intergranular Fracture Processes in Creep. P. W. Davies and J. P. Dennison. Institute of Metals, Journal, v. 87, pt. 4, Dec. 1958, p, 119.125. Slow deformation of metals at elevated temperatures is known to lead to $he development of intergranular cracks. Both qualitative and quantitative aspects of the theories relating to such internal fissuring are reviewed, and it is shown that different processes become operative according to the prevailing conditions of stress and temperature.
The Markings on Fracture Surfaces. Eugene F. Poncelet. Society of Glass Technology, Journal, v. 42, Dec. 1958, p. r79T-z88T + 8 plates. Fracture surfaces on glasses exhibit characteristic marking which can be interpreted in terms of the author’s theory of propagation of fracture; this theory is summarized briefly and is illustrated by a collection of photographs of various forms of fracture surfaces. On the Strength of Classical Fibres and Fibre Bundles. B. D. Coleman. Journal of the Mechanics and Physics of Solids, v. 7. no. I, Nov. 1958, p. 60-70. Discusses tensile strength distributions for fibres whose strength is independent of the rate of loading. Reasons are presented for expecting that the tensile strength should obey the Weibull distribution. The statistical theory of the strength of bundles of these fibres, as developed by Daniels, is applied to infinite bundles composed of fibres which obey the Weibull distribution. It is found that the ratio
of the tensile strength (units of force at break per initial unit area) of a bundle to the mean tensile strength of the constituent filaments decreases monotonically with increasing dispersion in the strength of the constituent filaments.
Internal Stresses and Fatigue in Metals.* A. M. Freudenthal. Physics Today, v. 12, Feb. 1959, p. 16-19. A symposium on Internal Stresses and Fatigue in Metals was held Sept. x-5, 1958, at the General Motors Research Laboratories. InAted papers were presented by research workers in solid-state physics, metal physics, and engineering from England, France, Germany, and the United States. The singular feature of the conference is the attempt to clarify some of the basic aspects of the two phenomena by considering them in the light of concepts of solid-state physics or physical metallurgy rather than in empirical engineering terms alone, and thus to promote a deeper understanding of the interaction of the phenomena of their metal physics by the “interaction” and engineering aspects. It is surprising to note how rapidly, through this interaction, the extensive progress in metal physics has transformed the engineer’s approach to the properties of the materials he uses, and has provided him with the beginning of that “sense of structure” which Cyril Smith considers to be the characteristic mark of the modern approach to the mechanics of matcrials, as distinct from the conventional or “classical” approach based on the mechanics of the solid isotropic continuum. Some Quantitative Information obtained from the Examination of Fatigue Fracture Surfaces. D. .4. Ryder. Royal Aircraft Establishment (Gt. Brit.) September 1958. 6 pp., diagrs., photos. (Ask for N-69106) Examination of the fracture of a programmed fatigue specimen has demonstrated that the * The Proceedings of this symposium, edited by G. M. Rassweiler and W. I<. Grube, have been published by ElsevierPublishingCo.Amsterdam. 1959, 451 Pp., 280 fig., 9 tables.