Sustained Load Crack Growth in Inconel 718 Under Non-isothermal Conditions PDF Download

Author: Douglas L. Miller (CAPT, USAF.)
Publisher:
ISBN:
Category : Inconel
Languages : en
Pages : 140

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Author: D. L. Miller
Publisher:
ISBN:
Category :
Languages : en
Pages : 80

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This investigation found linear cumulative damage modeling applicable to creep crack growth under non-isothermal conditions. The best results are obtained for high crack growth rates produced either by high temperature (above 593C), or by high stress intensities (K greater than 50 MPA square root of m). Except for one test, the linear model predicts conservative growth rates. Constant temperature data are collected for 537, 593, and 648C and presented as da/dt vs K curves. Center-cracked specimens of Inconel 718 are used. The isothermal baseline data are used to predict crack growth rates for the non-isothermal tests using linear cumulative modeling. The predicted creep crack growth rates were within a factor of two of the actual test data. The time-to-failure, predicted for one test, is 56 percent of the actual time to failure.

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1134

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Author: United States Air Force Academy
Publisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 172

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Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1468451979
Category : Science
Languages : en
Pages : 407

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Author:
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages :

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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 1052

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Author: K. E. Harms
Publisher:
ISBN:
Category :
Languages : en
Pages : 178

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This theses investigates the crack growth behavior of Inconel 718 effected by over-loads at elevated temperature. A cumulative damage model was developed to predict the total time-to-failure. Predictions were noted to improve at higher values of stress intensities. All tests were conducted under sustained loading with isothermal conditions of 650 C. Precracked compact tension specimens were used to establish a data base for baseline and overload conditions. The delay time associated with crack growth retardation was determined by comparing the baseline behavior with the results of the overload specimens. The effects of 20-and 50-percent overloads of 1 minute or 1 hour duration were investigated. The shape of the crack tip plastic zone and, hence, the retardation effect was found to be independent of overload duration. The retardation delay time was found to be dependent upon the overload magnitude and the value of K at which the overload was removed. It was also found that a sudden crack advancement occurred when the overload was applied. The above factors were accounted for in the model development. The model was generally capable of predicting the time-to-failure within about 10 percent of the actual material behavior. Originator supplied keywords: Sustained-load crack growth; Crack growth retardation; Elevated temperature; Nickel-based superalloy; Crack growth model; Overloads; Data reduction; Graphs.

Author: Michael R. Mitchell
Publisher: ASTM International
ISBN: 0803114230
Category : Fracture mechanics
Languages : en
Pages : 495

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Twenty-seven papers from fatigue researchers and practitioners review in detail recent progress in the development of methods to predict fatigue performance of materials and structures and to assess the extent to which these new methods are finding their way into practice. The papers, from the ASTM

Author:
Publisher:
ISBN:
Category : Military art and science
Languages : en
Pages : 248

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