Fatigue Crack Growth Rates in Pressure Vessel and Piping Steels in LWR Environments PDF Download
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Author: W. H. Cullen
Publisher:
ISBN:
Category : Light water reactors
Languages : en
Pages : 80
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Book Description
Author: W. H. Cullen
Publisher:
ISBN:
Category : Light water reactors
Languages : en
Pages : 80
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Book Description
Author: W. H. Cullen
Publisher:
ISBN:
Category : Fractography
Languages : en
Pages : 134
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Book Description
Fatigue crack growth data sets, for pressure vessel and piping steels, in reactor-grade water environment have appeared in various reports and publications since about 1972. All of the results which have been published from 1972 through 1979 have been plotted and are presented in this report. Beginning with a discussion of the need for these data, and an explanation of the laboratory facilities which are required for this research, this report goes on to describe the overall trends which have evolved through consideration of the data sets and the conditions under which they were generated. A model for hydrogen assisted fatigue crack growth is described and applied to the pressurized water reactor type of environment. A complete listing of references is included in the report. (Author).
Author: W. H. Cullen
Publisher:
ISBN:
Category : Fractography
Languages : en
Pages : 41
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The fatigue crack growth behavior of A533B and A508 pressure vessel steel and AISI Types 304 and 316 steels used in reactor coolant piping have been studied in a pressurized water reactor environment at 288°C (550°F). The influence of stress ratio (P/sub min//P/sub max/), frequency, ramp times, specimen orientation and material microstructures were included in the study. While none of the materials showed evidence of static crack growth in the environment, the ferritic steels did show an enhanced fatigue crack growth rate at test frequencies of five cycles per minute and lower. Based on fractographic examinations the enhanced growth rate is not the result of environmentally induced intergranular or cleavage modes of crack propagation. Instead, striation spacing measurements were found to agree with the macroscopic crack growth rate, demonstrating a time dependent environmental interaction which introduces a frequency dependent enhancement of the mechanically developed striations. Crack growth experiments using hold times have confirmed the absence of any superimposed contribution of static crack growth components. Fatigue crack growth tests were conducted in an environment of Hydrogen Sulfide gas to establish the contribution of hydrogen embrittlement and will also be described.
Author: Hardayal S. Mehta
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 396
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Book Description
Comprises 40 papers from the July 1998 Conference. Topics include piping and vessel evaluations (mathematical modeling of weld and residual stresses, behavior of vessel cladding, and the treatment of extrusion pressures); fatigue in piping and pressure vessels (refinery RPG bullets, biaxial fatigue crack propagation, effect of machining procedures on fatigue behavior of PWR piping, fatigues of butt welded pipes, and notched stainless steel specimens); fatigue and environmental factors (effects of strain rate, oxygen, and temperature); and new and high temperature materials. Contains an author index but no subject index. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Sharif Rahman
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 290
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Book Description
Contains 24 papers from an August 1999 conference, organized in two sections on probabilistic fatigue, fracture, and reliability, and environmental fractures and fatigue life. Papers present novel analytical and experimental methods related to fatigue, fracture mechanics, and environmental factors f
Author: WH. Cullen
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 22
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Book Description
This paper presents an overview of the effect of light-water reactor environments on the fatigue crack growth rate in reactor pressure vessel steels. The effect of different variables known to influence the environmental assistance--stress intensity range, load ratio, frequency, temperature, water chemistry, and irradiation--is described. The fractographic phenomena and mechanisms of fatigue crack propagation associated with environmental influence is emphasized. An analytical approach for predicting the crack growth rates based on the hydrogen embrittlement model is described. Finally, a discussion of the effect of different transients occurring in the nuclear reactors on the crack growth rate predictions is presented.
Author: H. E. Hanninen
Publisher:
ISBN:
Category : Nuclear pressure vessels
Languages : en
Pages : 114
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Book Description
Author: Materials Engineering Associates
Publisher:
ISBN:
Category : Light water reactors
Languages : en
Pages : 120
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 536
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Book Description
