Author: DJ. Ayres
Publisher:
ISBN:
Category : Crack arrest
Languages : en
Pages : 28
Book Description
A new fracture test specimen has been developed to study crack extension and arrest in nuclear reactor vessel steels subjected to stress-intensity factor and toughness gradients similar to those in postulated pressurized thermal shock situations. A summary of the results of all the tests performed is presented to illustrate the range of crack arrest and crack reinitiation conditions observed. One test of this specimen with the corresponding stress analysis is described in detail. During this test the crack initiated, extended, arrested, reinitiated, extended again, and reached a final arrest. Comparison of detailed dynamic elastic-plastic finite-element analyses and dynamic strain and displacement measurements of the crack extension, arrest, and reinitiation events, combined with topographic analysis of the fracture surfaces, has led to a new understanding of the crack extension and arrest process. The results of the tests demonstrate crack arrest in a rising stress-intensity field at near-upper-shelf temperature conditions and show that the toughness required for arrest is lower than would be predicted by the analysis procedures usually employed for pressurized thermal shock evaluations.
Comparison of Analysis and Experimental Data for a Unique Crack Arrest Specimen
Author: DJ. Ayres
Publisher:
ISBN:
Category : Crack arrest
Languages : en
Pages : 28
Book Description
A new fracture test specimen has been developed to study crack extension and arrest in nuclear reactor vessel steels subjected to stress-intensity factor and toughness gradients similar to those in postulated pressurized thermal shock situations. A summary of the results of all the tests performed is presented to illustrate the range of crack arrest and crack reinitiation conditions observed. One test of this specimen with the corresponding stress analysis is described in detail. During this test the crack initiated, extended, arrested, reinitiated, extended again, and reached a final arrest. Comparison of detailed dynamic elastic-plastic finite-element analyses and dynamic strain and displacement measurements of the crack extension, arrest, and reinitiation events, combined with topographic analysis of the fracture surfaces, has led to a new understanding of the crack extension and arrest process. The results of the tests demonstrate crack arrest in a rising stress-intensity field at near-upper-shelf temperature conditions and show that the toughness required for arrest is lower than would be predicted by the analysis procedures usually employed for pressurized thermal shock evaluations.
Publisher:
ISBN:
Category : Crack arrest
Languages : en
Pages : 28
Book Description
A new fracture test specimen has been developed to study crack extension and arrest in nuclear reactor vessel steels subjected to stress-intensity factor and toughness gradients similar to those in postulated pressurized thermal shock situations. A summary of the results of all the tests performed is presented to illustrate the range of crack arrest and crack reinitiation conditions observed. One test of this specimen with the corresponding stress analysis is described in detail. During this test the crack initiated, extended, arrested, reinitiated, extended again, and reached a final arrest. Comparison of detailed dynamic elastic-plastic finite-element analyses and dynamic strain and displacement measurements of the crack extension, arrest, and reinitiation events, combined with topographic analysis of the fracture surfaces, has led to a new understanding of the crack extension and arrest process. The results of the tests demonstrate crack arrest in a rising stress-intensity field at near-upper-shelf temperature conditions and show that the toughness required for arrest is lower than would be predicted by the analysis procedures usually employed for pressurized thermal shock evaluations.
Fracture Mechanics, Nineteenth Symposium
Author: Thomas A. Cruse
Publisher: ASTM International
ISBN: 0803109725
Category : Fracture mechanics
Languages : en
Pages : 936
Book Description
Publisher: ASTM International
ISBN: 0803109725
Category : Fracture mechanics
Languages : en
Pages : 936
Book Description
Crack Arrest Concepts for Failure Prevention and Life Extension
Author: Gyoujin Cho
Publisher: Woodhead Publishing
ISBN: 9781855732643
Category : Technology & Engineering
Languages : en
Pages : 334
Book Description
The proceedings of a seminar held at TWI in September, 1995, focusing on crack arrest philosophy which aknowledges that a brittle crack is arrested when it emerges from the critical region. Papers from prestigious researchers presented a critique and assessment of the theory and its application under: Introduction to crack arrest concepts; Recent trends in crack arrest research; Application of crack arrest concepts.
Publisher: Woodhead Publishing
ISBN: 9781855732643
Category : Technology & Engineering
Languages : en
Pages : 334
Book Description
The proceedings of a seminar held at TWI in September, 1995, focusing on crack arrest philosophy which aknowledges that a brittle crack is arrested when it emerges from the critical region. Papers from prestigious researchers presented a critique and assessment of the theory and its application under: Introduction to crack arrest concepts; Recent trends in crack arrest research; Application of crack arrest concepts.
Advances in Nuclear Science and Technology
Author: Jeffery Lewins
Publisher: Springer Science & Business Media
ISBN: 0306470888
Category : Technology & Engineering
Languages : en
Pages : 180
Book Description
Since its initiation in 1962, this series has presented authoritative reviews of the most important developments in nuclear science and engineering, from both theoretical and applied perspectives. In addition, many original contributions are included.
Publisher: Springer Science & Business Media
ISBN: 0306470888
Category : Technology & Engineering
Languages : en
Pages : 180
Book Description
Since its initiation in 1962, this series has presented authoritative reviews of the most important developments in nuclear science and engineering, from both theoretical and applied perspectives. In addition, many original contributions are included.
Metals Abstracts
Experimental Analysis of Dynamic Effects in Different Crack Arrest Test Specimens
Author: J. Beinert
Publisher:
ISBN:
Category : Crack arrest
Languages : en
Pages : 19
Book Description
For different crack arrest test specimens, the influence of dynamic effects on the crack arrest process is investigated. Utilizing the shadow optical method of caustics, actual dynamic stress-intensity factors directly before, at, and after arrest were measured. In the first part of the investigation, specimens made from the model material Araldite B were analyzed. It was found that the dynamic effects, that is, the difference between statically and dynamically determined crack arrest stress-intensity factors, are largest for longitudinal wedge-loaded rectangular double cantilever beam specimens, considerably smaller for machine-loaded tapered double cantilever beam specimens, and smallest for transverse wedge-loaded compact specimens. In the second part of the paper, the behavior of arresting cracks in high-strength steel specimens was investigated. The overall dynamic effects on the crack arrest process were found to be similar to those in Araldite B, but in steel the oscillation of the dynamic stress-intensity factor after arrest shows higher-frequency disturbances and is damped out only after much longer times.
Publisher:
ISBN:
Category : Crack arrest
Languages : en
Pages : 19
Book Description
For different crack arrest test specimens, the influence of dynamic effects on the crack arrest process is investigated. Utilizing the shadow optical method of caustics, actual dynamic stress-intensity factors directly before, at, and after arrest were measured. In the first part of the investigation, specimens made from the model material Araldite B were analyzed. It was found that the dynamic effects, that is, the difference between statically and dynamically determined crack arrest stress-intensity factors, are largest for longitudinal wedge-loaded rectangular double cantilever beam specimens, considerably smaller for machine-loaded tapered double cantilever beam specimens, and smallest for transverse wedge-loaded compact specimens. In the second part of the paper, the behavior of arresting cracks in high-strength steel specimens was investigated. The overall dynamic effects on the crack arrest process were found to be similar to those in Araldite B, but in steel the oscillation of the dynamic stress-intensity factor after arrest shows higher-frequency disturbances and is damped out only after much longer times.
Dynamic Fracture Mechanics for the 1990's
Author: Hiroomi Honma
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 204
Book Description
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 204
Book Description