Fracture Toughness Assessment of Present and Future Pressure Vessel Materials Based on Charpy Impact Energy and Yield Strength PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 14
Book Description
Several medium and high strength alloys, including AF1410, Inconel 718, PH 13-8 Mo stainless steel, and ASm(A723 high strength low alloy steel, have been heat treated to various strength and toughness levels and evaluated for correlations between fracture toughness and charpy impact energy. The correlations investigated included those by Roffe-Novak and Ault-Wald-Bertolo. previous work by Kapp and Underwood suggests that for A723 steel, the Rolfe-Novak correlation predicts the fracture toughness reasonably well. One potential limitation of their study was that the charpy impact energy was measured at -40 deg f, whereas the toughness was evaluated at room temperature. This study evaluates Charpy impact energy and toughness at both room temperature and at -40 deg F and considers both when utilizing these correlations. Results of this study indicate that the Rolfe-Novak correlation over-predicts the measured fracture toughness at room temperature, and tends to underpredict the measured fracture toughness at 40 deg F. The Ault-Wald-Bertolo correlation, in all but one instance, was a conservative estimate of the measured fracture toughness of the material at both room temperature and 40 deg F. Utilizing the results presented in this study, it is recommended that if a correlation is necessary for estimating the toughness of any of the materials, the Ault-Wald-Bertolo correlation will result in a conservative estimate of toughness. (MM).
Author: Publisher: ISBN: Category : Languages : en Pages : 14
Book Description
Several medium and high strength alloys, including AF1410, Inconel 718, PH 13-8 Mo stainless steel, and ASm(A723 high strength low alloy steel, have been heat treated to various strength and toughness levels and evaluated for correlations between fracture toughness and charpy impact energy. The correlations investigated included those by Roffe-Novak and Ault-Wald-Bertolo. previous work by Kapp and Underwood suggests that for A723 steel, the Rolfe-Novak correlation predicts the fracture toughness reasonably well. One potential limitation of their study was that the charpy impact energy was measured at -40 deg f, whereas the toughness was evaluated at room temperature. This study evaluates Charpy impact energy and toughness at both room temperature and at -40 deg F and considers both when utilizing these correlations. Results of this study indicate that the Rolfe-Novak correlation over-predicts the measured fracture toughness at room temperature, and tends to underpredict the measured fracture toughness at 40 deg F. The Ault-Wald-Bertolo correlation, in all but one instance, was a conservative estimate of the measured fracture toughness of the material at both room temperature and 40 deg F. Utilizing the results presented in this study, it is recommended that if a correlation is necessary for estimating the toughness of any of the materials, the Ault-Wald-Bertolo correlation will result in a conservative estimate of toughness. (MM).
Author: T. Iwadate Publisher: ISBN: Category : Crack propagation Languages : en Pages : 14
Book Description
The validity of the Barsom, Rolfe, and Novak correlation between Charpy energy, yield strength, and KIc in the upper-shelf region has been confirmed for 21⁄4Cr-1Mo pressure vessel steels. The relationship between the excess temperature and KIc/KIc-upper shelf has also been developed. Based on these relationships, KIc transition curves may be predicted from Charpy V-notch test results of 21⁄4Cr-1Mo pressure vessel steels.
Author: H. Kotilainen Publisher: ISBN: Category : Cleavage fracture Languages : en Pages : 16
Book Description
A new model for the temperature dependence of the fracture toughness has been sought. It is based on the yielding processes at the crack tip, which are thought to be competitive with fracture. Using this method a good correlation between measured and calculated values of fracture toughness has been found for a Cr-Mo-V pressure vessel steel as well as for A533B. It has been thought that the application of this method can reduce the number of surveillance specimens in nuclear reactors.
Author: MR. Goldthorpe Publisher: ISBN: Category : Biaxial wide plate tests Languages : en Pages : 23
Book Description
A method of analyzing the ductile to brittle transition region of a ferritic steel using a coupled micromechanical model of ductile damage, stable crack growth and cleavage fracture has been developed to improve the definition of upper shelf behavior for actual structures. Ductile damage is modelled using the Gurson model as modified by Tvergaard, along with a specially developed crack growth user element. The probability of cleavage fracture is predicted by post-processing the finite element results using the Beremin model of cleavage fracture. Predictions are made of ductile tearing and cleavage fracture in test specimen and wide plate configurations of A533B steel for a range of temperatures. The coupled model is capable of predicting transition toughness and transition temperature shifts for different levels of structural constraint. An analytically-based definition of the onset of upper shelf temperature (OUST) is the temperature at which the coupled ductile damage/cleavage fracture model predicts a probability of failure by cleavage fracture of 5%. Estimates of the shift in the OUST due to different levels of in-plane crack tip constraint are made using the elastic T-stress as a measure of constraint. There is potential for using the T-stress as a measure of structural constraint in order to determine shifts in transition temperature for materials with degraded toughness.
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Author: T. Iwadate
Author: K. L. Maurer
Author: American Society of Mechanical Engineers. Winter Annual Meeting
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Author: Michael J. Viens
Author: H. Kotilainen
Author: N. E. Clark
Author: MR. Goldthorpe