Micromechanical Prediction Of Fracture Toughness For Pressure Vessel Steel Using A Coupled Model

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Micromechanical Prediction Of Fracture Toughness For Pressure Vessel Steel Using A Coupled Model

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Author : MR. Goldthorpe
language : en
Publisher:
Release Date : 1999

Micromechanical Prediction Of Fracture Toughness For Pressure Vessel Steel Using A Coupled Model written by MR. Goldthorpe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Biaxial wide plate tests categories.

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.

Fatigue And Fracture Mechanics

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Author : Tina Louise Panontin
language : en
Publisher: ASTM International
Release Date : 1999

Fatigue And Fracture Mechanics written by Tina Louise Panontin and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Fatigue categories.

Application Of Micromechanical Material Models For The Evaluation Of The Fracture Toughness Of Primary Circuit Steel Components

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Author : JG. Blauel
language : en
Publisher:
Release Date : 1993

Application Of Micromechanical Material Models For The Evaluation Of The Fracture Toughness Of Primary Circuit Steel Components written by JG. Blauel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Annealing of metals categories.

The safety assessment of nuclear components requires that fracture mechanics material data or curves are available. These data must be measured with suitable specimens of the original material for the given condition, i.e., temperature and irradiation. Especially for reactor pressure vessel (RPV) weld material, fracture mechanics specimens are not available within the irradiation surveillance programs in sufficient number, or, if available, the performance of accurate fracture mechanics tests in hot cell facilities is extremely difficult.

The Use Of Miniaturized Tests To Predict Flow Properties And Estimate Fracture Toughness In Deformed Steel Plates

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Author : FM. Haggag
language : en
Publisher:
Release Date : 1990

The Use Of Miniaturized Tests To Predict Flow Properties And Estimate Fracture Toughness In Deformed Steel Plates written by FM. Haggag and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Ball indentation test categories.

Prediction of failure in a structure requires knowledge of the mechanical properties of the materials involved. In the case of serious accidents, such as derailments of railroad tank cars carrying hazardous materials, prediction of failure in damaged components is impeded by difficulties in determining the deformed material fracture toughness, the cracks induced by the accident, and the stress state in the damaged region. This paper addresses the problem of determining fracture toughness. Miniaturized shear punch tests on virgin, strained, and deformed steel plates (typical of railroad tank car construction) were conducted over a wide range of test temperatures. These data were compared with tensile properties measurements on identical materials. The use of these data coupled with micromechanical models of fracture allows estimation of the deformed material fracture toughness. Comparisons of the predicted fracture toughness with actual measurements are made.

A Probabilistic Model Including Constraint And Plastic Strain Effects For Fracture Toughness Predictions In A Pressure Vessel Steel

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Author :
language : en
Publisher:
Release Date : 2016

A Probabilistic Model Including Constraint And Plastic Strain Effects For Fracture Toughness Predictions In A Pressure Vessel Steel written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

Use Of Thickness Reduction To Estimate Fracture Toughness

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Author : R. deWit
language : en
Publisher:
Release Date : 1993

Use Of Thickness Reduction To Estimate Fracture Toughness written by R. deWit and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Continuum mechanics categories.

To help predict the behavior of a nuclear pressure vessel undergoing pressurized thermal shock, values of the arrest toughness are required. The purpose of the work described here is to show how toughness values can be calculated from the thickness reduction (TR) of the tested specimens and then used as "lower-bound" estimates. In the NIST wide-plate crack-arrest test program, 16 single edge-notched tension specimens were fractured, using the 26.7 MN universal testing machine. The first series of tests used HSST A533 Grade B Class 1 quenched and tempered steel, while the second series used a low upper-shelf 21/4 Cr-1 Mo steel. For each specimen the TR was measured on the two halves of the broken specimen and a contour map was constructed. The thickness reduction, TR, along the crack propagation plane can be related to the toughness, K, by the relationship K2 = E • ?Y • TR, where E is Young's modulus and ?Y an estimate of the tension effective yield strength adjusted for temperature, strain-rate, and constraint. The results show good agreement with values of K for arrest and reinitiation computed from a finite-element generation-mode analysis. Therefore, the indication of plastic work rate provided by the thickness reduction near the fracture plane is a useful preliminary assessment of the fracture toughness.

Modeling Pressure Vessel Toughness With Various Small Specimens

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Author :
language : en
Publisher:
Release Date : 2001

Modeling Pressure Vessel Toughness With Various Small Specimens written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Specimen configuration and size are often secondary considerations when performing fracture toughness tests. Typically the user will select a specimen geometry and size that are compatible with the material configuration, the type and size of the loading machine, and the devises that are available. In the work here, special consideration is given to identifying the best configuration for measuring the fracture toughness of an internally-loaded pressure vessel. The work utilizes the Bowie and Freese stress intensity factor, K, for a pressurized cylinder over a wide range of crack lengths and cylinder wall ratios, with K normalized by von Mises combined stresses and remaining ligament (K/sigma VM(w-a)(exp 1/2).. This normalized K, when compared to the normalized K for the single-edge notched bend, SEN(B), the compact tension, C(T), and the middle tension, M(T), clearly indicates that depending on the a/w ratio, each of the specimens provides an optimum location where it can be used to model the pressure vessel. For intermediate a/w, as recommended by ASTM Test Method for Plane-Strain Fracture Toughness of Metallic Materials (E399), all of the specimens investigated distinctly under-predict the actual toughness of the pressure vessel. For the case of the pressure vessel with a wall ratio (w) of two, an under-prediction in toughness of 35% is predicted for the SEN(B) and M(T) specimens, and a 47% under-prediction is predicted for the C(T) specimen (at a/w = 0.5). Experiments were conducted on ASTM A723 steel (yield strength = 1125 MPa) at a/w ratios of 0.2, 0.467, 0.6, and 0.8 for the SEN(B), C(T), and M(T) specimens.

Prediction Of Fracture Toughness Kic Of 21 4cr 1mo Pressure Steels From Charpy V Notch Test Results

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Author : T. Iwadate
language : en
Publisher:
Release Date : 1977

Prediction Of Fracture Toughness Kic Of 21 4cr 1mo Pressure Steels From Charpy V Notch Test Results written by T. Iwadate and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Crack propagation categories.

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.

Prediction Of Characteristic Length And Fracture Toughness In Ductile Brittle Transition

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Author :
language : en
Publisher:
Release Date : 2008

Prediction Of Characteristic Length And Fracture Toughness In Ductile Brittle Transition written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.

Finite element method was used to analyze the three-point bend experimental data of A533B-1 pressure vessel steel obtained by Sherry, Lidbury, and Beardsmore [1] from -160 to -45 C within the ductile-brittle transition regime. As many researchers have shown, the failure stress ([sigma]{sub f}) of the material could be approximated as a constant. The characteristic length, or the critical distance (r{sub c}) from the crack tip, at which [sigma]{sub f} is reached, is shown to be temperature dependent based on the crack tip stress field calculated by the finite element method. With the J-A2 two-parameter constraint theory in fracture mechanics, the fracture toughness (J{sub C} or K{sub JC}) can be expressed as a function of the constraint level (A2) and the critical distance r{sub c}. This relationship is used to predict the fracture toughness of A533B-1 in the ductile-brittle transition regime with a constant [sigma]{sub f} and a set of temperature-dependent r{sub c}. It can be shown that the prediction agrees well with the test data for wide range of constraint levels from shallow cracks (a/W= 0.075) to deep cracks (a/W= 0.5), where a is the crack length and W is the specimen width.

Fracture Toughness Predictions For Modern Low Carbon High Strength Steels Based On Microstructural And Micromechanistic Approaches

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Author :
language : en
Publisher:
Release Date : 2002

Fracture Toughness Predictions For Modern Low Carbon High Strength Steels Based On Microstructural And Micromechanistic Approaches written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Steel, High strength categories.