Author: J. M. INGRAHAMPublisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
Fracture Behavior of Steel Pressure Vessels at the Ductile-brittle Transition
Author: J. M. INGRAHAMFracture Behavior of a Pressure Vessel Steel in the Ductile-to-brittle Transition Region
Author: J. HeerensFracture Behavior of a Pressure Vessel Steel in the Ductile-to-brittle Transition Region
Author: Jürgen HeerensPublisher:
ISBN:
Category : Pressure vessels
Languages : en
Pages : 39
Book Description
Modeling the Ductile Brittle Fracture Transition in Reactor Pressure Vessel Steels Using a Cohesive Zone Model Based Approach
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Fracture properties of Reactor Pressure Vessel (RPV) steels show large variations with changes in temperature and irradiation levels. Brittle behavior is observed at lower temperatures and/or higher irradiation levels whereas ductile mode of failure is predominant at higher temperatures and/or lower irradiation levels. In addition to such temperature and radiation dependent fracture behavior, significant scatter in fracture toughness has also been observed. As a consequence of such variability in fracture behavior, accurate estimates of fracture properties of RPV steels are of utmost importance for safe and reliable operation of reactor pressure vessels. A cohesive zone based approach is being pursued in the present study where an attempt is made to obtain a unified law capturing both stable crack growth (ductile fracture) and unstable failure (cleavage fracture). The parameters of the constitutive model are dependent on both temperature and failure probability. The effect of irradiation has not been considered in the present study. The use of such a cohesive zone based approach would allow the modeling of explicit crack growth at both stable and unstable regimes of fracture. Also it would provide the possibility to incorporate more physical lower length scale models to predict DBT. Such a multi-scale approach would significantly improve the predictive capabilities of the model, which is still largely empirical.
Brittle Fracture in Steel Structures
Author: Great Britain. Navy Department. Advisory Committee on Structural SteelsPublisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 144
Book Description
Ductile Fracture Toughness of Heavy Section Pressure Vessel Steel Plate
Author: J. A. WilliamsPublisher:
ISBN:
Category : Government publications
Languages : en
Pages : 60
Book Description
Prediction of Characteristic Length and Fracture Toughness in Ductile-Brittle Transition
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publications of the National Institute of Standards and Technology ... Catalog
Author: National Institute of Standards and Technology (U.S.)Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 424
Book Description
Fracture Mechanics, Nineteenth Symposium
Author: Thomas A. CrusePublisher: ASTM International
ISBN: 0803109725
Category : Fracture mechanics
Languages : en
Pages : 936
Book Description
Dynamic Initiation Fracture Toughness of a Pressure Vessel Steel in the Transition Region
Author: SM. GrahamPublisher:
ISBN:
Category : Bruchmechanik
Languages : en
Pages : 23
Book Description
The dynamic fracture toughness of an ASTM A533, Grade B steel plate was determined at several temperatures in the ductile-brittle transition region. Crack-tip loading rates ranged from approximately 103 to 105 MPa?m/s. The fracture toughness was shown to decrease with increased loading rate. The dynamic fracture toughness was compared with results from previous investigations and it was shown that the decrease in toughness due to increased loading rate at the highest test temperature was not as severe as reported in previous investigations. It was also shown that the reference temperature, T0, was a better index of the fracture toughness vs. temperature relationship than the nil-ductility temperature, RTNDT for this material.