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Influence Of Crack Depth On The Fracture Toughness Of Reactor Pressure Vessel Steel
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Book Synopsis Influence of Crack Depth on the Fracture Toughness of Reactor Pressure Vessel Steel by : JW. Bryson
Download or read book Influence of Crack Depth on the Fracture Toughness of Reactor Pressure Vessel Steel written by JW. Bryson and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Heavy Section Steel Technology Program (HSST) at Oak Ridge National Laboratory (ORNL) is investigating the influence of flaw depth on the fracture toughness of reactor pressure vessel (RPV) steel. Recently, it has been shown that, in notched beam testing, shallow cracks tend to exhibit an elevated toughness as a result of a loss of constraint at the crack tip. The loss of constraint takes place when interaction occurs between the elastic-plastic crack-tip stress field and the specimen surface nearest the crack tip. An increased shallow-crack fracture toughness is of interest to the nuclear industry because probabilistic fracture-mechanics evaluations show that shallow flaws play a dominant role in the probability of vessel failure during postulated pressurized-thermal-shock (PTS) events.
Book Synopsis Influence of Crack Depth on the Fracture Toughness of Reactor Pressure Vessel Steel by :
Download or read book Influence of Crack Depth on the Fracture Toughness of Reactor Pressure Vessel Steel written by and published by . This book was released on 1991 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Heavy Section Steel Technology Program (HSST) at Oak Ridge National Laboratory (ORNL) is investigating the influence of flaw depth on the fracture toughness of reactor pressure vessel (RPV) steel. Recently, it has been shown that, in notched beam testing, shallow cracks tend to exhibit an elevated toughness as a result of a loss of constraint at the crack tip. The loss of constraint takes place when interaction occurs between the elastic-plastic crack-tip stress field and the specimen surface nearest the crack tip. An increased shallow-crack fracture toughness is of interest to the nuclear industry because probabilistic fracture-mechanics evaluations show that shallow flaws play a dominant role in the probability of vessel failure during postulated pressurized-thermal-shock (PTS) events. Tests have been performed on beam specimens loaded in 3-point bending using unirradiated reactor pressure vessel material (A533 B). Testing has been conducted using specimens with a constant beam depth (W = 94 mm) and within the lower transition region of the toughness curve for A533 B. Test results indicate a significantly higher fracture toughness associated with the shallow flaw specimens compared to the fracture toughness determined using deep-crack (a/W = 0.5) specimens. Test data also show little influence of thickness on the fracture toughness for the current test temperature ( -60°C). 21 refs., 5 figs., 3 tabs.
Book Synopsis Analytical Modeling of the Effect of Crack Depth, Specimen Size, and Biaxial Stress on the Fracture Toughness of Reactor Vessel Steels by :
Download or read book Analytical Modeling of the Effect of Crack Depth, Specimen Size, and Biaxial Stress on the Fracture Toughness of Reactor Vessel Steels written by and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture, toughness values for A533-B reactor pressure vessel (RPV) steel obtained from test programs at Oak Ridge National Laboratory (ORNL) and University of Kansas (KU) are interpreted using the J-A2 analytical model. The analytical model is based on the critical stress concept and takes into consideration the constraint effect using the second parameter A2 in addition to the generally accepted first parameter J which represents the loading level. It is demonstrated that with the constraint level included in the model effects of crack depth (shallow vs deep), specimen size (small vs. large), and loading type (uniaxial vs biaxial) on the fracture toughness from the test programs can be interpreted and predicted.
Book Synopsis Constraint Effects in Fracture by : E. M. Hackett
Download or read book Constraint Effects in Fracture written by E. M. Hackett and published by ASTM International. This book was released on 1993 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the symposium on [title] held in Indianapolis, Indiana, May 1991, provide a framework for quantifying constraint effects in terms of both continuum mechanics and micro-mechanical modeling approaches. Such a framework is useful in establishing accurate predictions of the fracture
Book Synopsis Recommendations for the Shallow-crack Fracture Toughness Testing Task Within the HSST (Heavy-Section Steel Technology) Program by :
Download or read book Recommendations for the Shallow-crack Fracture Toughness Testing Task Within the HSST (Heavy-Section Steel Technology) Program written by and published by . This book was released on 1990 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recommendations for Heavy-Section Steel Technology Program's investigation into the influence of crack depth on the fracture toughness of a steel prototypic of those in a reactor pressure vessel are included in this report. The motivation for this investigation lies in the fact that probabilistic fracture mechanics evaluations show that shallow flaws play a dominant role in the likelihood of vessel failure, and shallow-flaw specimens have exhibited an elevated toughness compared with conventional deep-notch fracture toughness specimens. Accordingly, the actual margin of safety of vessels may be greater than that predicted using existing deep-notch fracture-toughness results. The primary goal of the shallow-crack project is to investigate the influence of crack depth on fracture toughness under conditions prototypic of a reactor vessel. A limited data base of fracture toughness values will be assembled using a beam specimen of prototypic reactor vessel material and with a depth of 100 mm (4 in.). This will permit comparison of fracture-toughness data from deep-cracked and shallow-crack specimens, and this will be done for several test temperatures. Fracture-toughness data will be expressed in terms of the stress-intensity factor and crack-tip-opening displacement. Results of this investigation are expected to improve the understanding of shallow-flaw behavior in pressure vessels, thereby providing more realistic information for application to the pressurized-thermal shock issues. 33 refs., 17 figs.
Book Synopsis Biaxial Loading Effects on Fracture Toughness of Reactor Pressure Vessel Steel by :
Download or read book Biaxial Loading Effects on Fracture Toughness of Reactor Pressure Vessel Steel written by and published by . This book was released on 1995 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of Fracture Toughness, Fatigue-crack Growth, Sustained-load Flaw Growth, and Impact Properties of Three Pressure Vessel Steels by : Charles Michael Hudson
Download or read book An Investigation of Fracture Toughness, Fatigue-crack Growth, Sustained-load Flaw Growth, and Impact Properties of Three Pressure Vessel Steels written by Charles Michael Hudson and published by . This book was released on 1975 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of the Effects of Various Geometrical and Loading Parameters on the Fracture Resistance Behaviour of a Reactor-Grade Pressure Vessel Steel in the Upper Shelf as Well as DBTT Regime by : M. K. Samal
Download or read book Study of the Effects of Various Geometrical and Loading Parameters on the Fracture Resistance Behaviour of a Reactor-Grade Pressure Vessel Steel in the Upper Shelf as Well as DBTT Regime written by M. K. Samal and published by . This book was released on 2015 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike mechanical properties, the fracture resistance behaviour of ductile materials depends upon the state of stress existing ahead of the growing crack-tip. For ductile materials, the fracture resistance, expressed in terms of J-R curve, goes on changing with crack growth. The J-R curves are influenced by the specimen geometry, size, crack-depth, and loading and boundary conditions, etc. Another complicacy arises in the ductile-to-brittle transition temperature regime, where the fracture toughness exhibits considerable scatter and dependency upon temperature. For structural integrity analysis of safety-critical components, fracture resistance data are required in the upper-shelf as well as in the transition regime in order to account for the design-basis postulated accidental loading conditions. It may not always be possible to carry out fracture tests on real-life components due to several limitations, including those of irradiation environment apart from the prohibitive cost and time required for the tests. Finite element (FE) analysis of the components with postulated cracks and loading conditions offer an impressive alternative to safety-analysts. In this work, experiments were conducted on two different types of fracture mechanics specimens not only in the upper-shelf but also in the transition regime. The effect of crack-depth on the fracture behaviour was studied using shallow-cracked and deep-cracked specimens. The size effect was studied using specimens with different thickness values. The effect of specimen geometry and loading condition was studied using a compact-tension and a single-edged-notched-bend specimen. For the FE analysis, nonlocal Rousselier's damage model was used. We extensively studied the effects of several variables on the fracture toughness of a ferritic pressure vessel steel, which have not received much attention in the literature. Extensive experiments were conducted to verify the numerical simulation results of nonlocal damage models.
Book Synopsis Assuring Structural Integrity of Steel Reactor Pressure Vessels by : Lendell E. Steele
Download or read book Assuring Structural Integrity of Steel Reactor Pressure Vessels written by Lendell E. Steele and published by . This book was released on 1980 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assuring Structural Integrity of Steel Reactor Pressure Boundary Components by : K. E. Stahlkopf
Download or read book Assuring Structural Integrity of Steel Reactor Pressure Boundary Components written by K. E. Stahlkopf and published by . This book was released on 1988 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Constraint Due to Out-of-Plane Stress Field on Fracture of Reactor Pressure Vessel Steel--An Experimental and Numerical Study by : D. Detty
Download or read book The Effect of Constraint Due to Out-of-Plane Stress Field on Fracture of Reactor Pressure Vessel Steel--An Experimental and Numerical Study written by D. Detty and published by . This book was released on 1995 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent research on crack-tip constraint on fracture, including the effect of in-plane biaxial stress fields, has led to a two-parameter elastic K-T and elasto-plastic J-Q approach to correlate fracture toughness. These approaches predict a significant influence of biaxial stress state on fracture toughness. In the case of reactor pressure vessels undergoing pressurized thermal shock (PTS), significant stresses induced parallel to the crack front (out-of-plane stresses) offer additional constraint at the crack-tip. In order to evaluate the effect of this out-of-plane stress field on fracture of reactor pressure vessel steels, a unique method for testing a cruciform-type double-edge notch, DEN(T), specimen loaded in biaxial tension was developed. Three-dimensional finite-element analyses were conducted to design the specimen configuration. Details of the experimental and analytical results and the significance of the crack-tip constraint, due to biaxial stress state involving out-of-plane stresses, on the fracture toughness in the transition region are presented.
Book Synopsis Shallow Crack Fracture Mechanics Toughness Tests and Applications by : Gyoujin Cho
Download or read book Shallow Crack Fracture Mechanics Toughness Tests and Applications written by Gyoujin Cho and published by Elsevier. This book was released on 1992-01-01 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the last decade there has been an increasing awareness that use of standards deeply notched fracture mechanics test specimens can result in substantial over-or-under-assessments of the real fracture toughness associated with shallow surface cracks.
Book Synopsis Effects of the Environment on the Initiation of Crack Growth by : William Alan Van der Sluys
Download or read book Effects of the Environment on the Initiation of Crack Growth written by William Alan Van der Sluys and published by ASTM International. This book was released on 1997 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Test Results from the HSST Shallow-crack Fracture Toughness Program. [Heavy Section Steel Technology. A36, A517, and A533 B Steels]. by :
Download or read book Preliminary Test Results from the HSST Shallow-crack Fracture Toughness Program. [Heavy Section Steel Technology. A36, A517, and A533 B Steels]. written by and published by . This book was released on 1991 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Heavy Section Steel Technology (HSST) Program under sponsorship of the Nuclear Regulatory Commission (NRC) is investigating the influence of crack depth on the fracture toughness of reactor pressure vessel steel. The ultimate goal of the investigation is the generation of a limited data base of elastic-plastic fracture toughness values appropriate for shallow flaws in a reactor pressure vessel and the application of this data to reactor vessel life assessments. It has been shown that shallow-flaws play a dominant role in the probabilistic fracture mechanics analysis of reactor pressure vessels during a pressurized-thermal-shock event. In addition, recent research has shown that the crack initiation toughness measured using specimens with shallow flaws is greater that the toughness determined with conventional, deeply notched specimens at temperatures within the transition region for non-nuclear steels. The influence of crack depth on the elastic-plastic fracture toughness for prototypic reactor material is being investigated. Preliminary results indicate a significant increase in the toughness associated with shallow-flaws which has the potential to significantly impact the conditional probability of vessel failure. 8 refs., 4 figs., 1 tab.
Book Synopsis The Effect of Crack Length and Side Grooves on the Ductile Fracture Toughness Properties of ASTM A533 Steel by : K. W. Carlson
Download or read book The Effect of Crack Length and Side Grooves on the Ductile Fracture Toughness Properties of ASTM A533 Steel written by K. W. Carlson and published by . This book was released on 1980 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Constraint on the Fracture Toughness of Reactor Pressure Vessel Steels by : Geena Kaur Rait
Download or read book The Effect of Constraint on the Fracture Toughness of Reactor Pressure Vessel Steels written by Geena Kaur Rait and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Critical Experiments, Measurements, and Analyses to Establish a Crack Arrest Methodology for Nuclear Pressure Vessel Steels by : George T. Hahn
Download or read book Critical Experiments, Measurements, and Analyses to Establish a Crack Arrest Methodology for Nuclear Pressure Vessel Steels written by George T. Hahn and published by . This book was released on 1979 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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