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Application Of A J Q Model For Fracture In The Ductile Brittle Transition
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Book Synopsis Application of a J-Q Model for Fracture in the Ductile-Brittle Transition by : JD. Landes
Download or read book Application of a J-Q Model for Fracture in the Ductile-Brittle Transition written by JD. Landes and published by . This book was released on 1997 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model to predict cleavage failure of precracked bodies in the transition region for steels was recently proposed by the author. It is based on the concept that the stress-controlled fracture of a weak link triggers the failure of the entire body. The stress that triggers fracture is predicted by a numerical crack-tip stress analysis. The model uses toughness measured at one condition as input to predict toughness at another. For example, toughness measured at one temperature can be used to predict toughness at another temperature, or toughness measured from one geometry can be used to predict toughness for another geometry.
Book Synopsis A constant-based model for fracture in the ductile-to-brittle transition region by : T. L. Anderson
Download or read book A constant-based model for fracture in the ductile-to-brittle transition region written by T. L. Anderson and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Fracture Toughness Scaling Models to the Ductile-to-brittle Transition by : R. E. Link
Download or read book Application of Fracture Toughness Scaling Models to the Ductile-to-brittle Transition written by R. E. Link and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Fracture Toughness Scaling Models to the Ductile-to- Brittle Transition by :
Download or read book Application of Fracture Toughness Scaling Models to the Ductile-to- Brittle Transition written by and published by . This book was released on 1996 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of fracture toughness in the ductile-brittle transition range was conducted. A large number of ASTM A533, Grade B steel, bend and tension specimens with varying crack lengths were tested throughout the transition region. Cleavage fracture toughness scaling models were utilized to correct the data for the loss of constraint in short crack specimens and tension geometries. The toughness scaling models were effective in reducing the scatter in the data, but tended to over-correct the results for the short crack bend specimens. A proposed ASTM Test Practice for Fracture Toughness in the Transition Range, which employs a master curve concept, was applied to the results. The proposed master curve over predicted the fracture toughness in the mid-transition and a modified master curve was developed that more accurately modeled the transition behavior of the material. Finally, the modified master curve and the fracture toughness scaling models were combined to predict the as-measured fracture toughness of the short crack bend and the tension specimens. It was shown that when the scaling models over correct the data for loss of constraint, they can also lead to non-conservative estimates of the increase in toughness for low constraint geometries.
Book Synopsis A Combined Statistical and Constraint Model for the Ductile-Brittle Transition Region by : TL. Anderson
Download or read book A Combined Statistical and Constraint Model for the Ductile-Brittle Transition Region written by TL. Anderson and published by . This book was released on 1988 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model is presented which uses weakest link statistics to predict the fracture toughness of ferritic steels in the ductile-brittle transition region. This model is different from previous analyses in that it considers large-scale yielding and specimen geometry effects.
Book Synopsis A Constraint-based Model for Fracture in the Ductile-to-brittle Transition Region by : Ted L. Anderson
Download or read book A Constraint-based Model for Fracture in the Ductile-to-brittle Transition Region written by Ted L. Anderson and published by . This book was released on 1984 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Crack-tip Region Constraint on Fracture in the Ductile-to-brittle Transition by : Ted L. Anderson
Download or read book Effect of Crack-tip Region Constraint on Fracture in the Ductile-to-brittle Transition written by Ted L. Anderson and published by . This book was released on 1984 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of geometry on fracture toughness of steel in the ductile-to-brittle transition region has been studied. The critical crack-tip opening displacement (CTOD) and the critical J-integral have been measured as a function of temperature for ten fracture specimen configurations of ABS grade EH36 steel. A technique was developed to experimentally measure crack-tip constraint. Constraint decreased with crack blunting. This relaxation in constraint was modeled by a simple spring analog. The model was used to predict ductile-to-brittle transition curves for hypothetical structures. Some of the applications and limitations of the model are discussed.
Book Synopsis Ductile Crack Growth Analysis Within the Ductile-Brittle Transition Regime by : I. Milne
Download or read book Ductile Crack Growth Analysis Within the Ductile-Brittle Transition Regime written by I. Milne and published by . This book was released on 1983 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ductile-brittle transition in ferritic steels is reviewed using data from pressure vessel steels A533B, A508, BS1501-271, and their associated weld metals and heat-affected zones in a variety of conditions. A schematic model is presented which provides a rational basis for understanding the phenomenon and making predictions. This model, which is consistent with the predictions obtained from physical models of cleavage fracture, contains the following important features. 1. If in the transition regime, KIc is defined as the fracture toughness at the onset of the brittle mode of fracture and KIJ is defined as the fracture toughness at the onset of ductile crack growth, then KIc > KIJ. 2. The ductile crack extension obtained between the initiation of ductile crack growth and the onset of brittle fracture is defined by the elastic-plastic crack growth resistance curve. 3. KIc cannot be reached without generating the appropriate amount of ductile crack extension.
Book Synopsis Modeling the Ductile Brittle Fracture Transition in Reactor Pressure Vessel Steels Using a Cohesive Zone Model Based Approach by :
Download or read book Modeling the Ductile Brittle Fracture Transition in Reactor Pressure Vessel Steels Using a Cohesive Zone Model Based Approach written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Fracture Mechanics Treatment of the Ductile-brittle Transition in Steel by :
Download or read book Fracture Mechanics Treatment of the Ductile-brittle Transition in Steel written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modeling of Crack Growth in Ductile-brittle Transition Regime by : Xiaosheng Gao
Download or read book Numerical Modeling of Crack Growth in Ductile-brittle Transition Regime written by Xiaosheng Gao and published by . This book was released on 1998 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ductile-Brittle Fracture Transition as a Result of Increasing In-Plane Constraint in a Medium Carbon Steel by : B. Cotterell
Download or read book Ductile-Brittle Fracture Transition as a Result of Increasing In-Plane Constraint in a Medium Carbon Steel written by B. Cotterell and published by . This book was released on 1994 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crack-tip opening displacement (CTOD) tests and large deformation finite element analyses have been carried out for double-edge notched tension [DE(T)] specimens with a/W = 0.9 [DE(T)9] and 0.5 [DE(T)5], single-edge notched tension [SE(T)] specimens with a/W = 0.5 [SE(T)5], three-point bend [SE(B)] specimens with a/W = 0.5 [SE(B)5] and 0.1 [SE(B)1], and center-cracked tension [M(T)] specimens with a/W = 0.5 [M(T)5]. The results of the CTOD tests show that the fracture toughness of the material decreases, and a ductile-brittle fracture transition takes place as the in-plane plastic constraint of the specimens increases. In M(T)5 and SE(B)1 specimens with low constraints, fracture is ductile and no transition occurs. In DE(T)5, SE(T)5, and SE(B)5 with higher constraints, fracture initiates by ductile tearing and then changes to cleavage. In the DE(T)9 specimens with the highest constraint, fracture initiates by brittle cleavage. The results of the finite element analyses show that the maximum achievable tensile stress outside the finite strain zone ahead of the crack tip increases with increasing plastic constraint in the order of M(T)5, SE(B)1, DE(T)5, SE(T)5, SE(B)5, and DE(T)9. The ductile-brittle transition is due to the maximum tensile stress ahead of the crack tip reaching the critical stress for cleavage fracture as the plastic constraint increases.
Book Synopsis Fracture and Ductile Vs. Brittle Behavior - Theory, Modelling and Experiment: Volume 539 by : Glenn E. Beltz
Download or read book Fracture and Ductile Vs. Brittle Behavior - Theory, Modelling and Experiment: Volume 539 written by Glenn E. Beltz and published by . This book was released on 1999-04-16 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dramatic progress has been made in the fundamentals of fracture, with special emphasis on the ductile/brittle transition across a broad spectrum of material classes. Unfortunately, however, since these studies are carried out in diverse research communities, communication among the different groups is limited. This book brings these diverse groups together. Contributions generally follow the topical outline upon which the symposium was organized. Part I deals with brittle/ductile behavior of steels and structural metallic alloys. The development of analytical models based on micromechanical models, such as dislocation mechanics and cohesive/contact zone models, is the focus of Part II. Nonmetals, including silicon, are reviewed in Parts III and IV. Fractals, chaos, and scaling theories, with emphasis on fracture in heterogeneous solids, is the basis of Part V. Crystal plasticity and mesoscale dislocation modelling follow in Part VI, with the technologically significant area of interfacial fracture featured in Part VII.
Book Synopsis Effects of Prior Ductile Tearing on Cleavage Fracture Toughness in the Transition Region by :
Download or read book Effects of Prior Ductile Tearing on Cleavage Fracture Toughness in the Transition Region written by and published by . This book was released on 1993 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous work by the authors described a micromechanics fracture model to correct measured J sub c-values for the mechanistic effects of large- scale yielding. This new work extends the model to also include the influence of ductile crack extension prior to cleavage. Ductile crack extensions of 10-15 X the initial crack tip opening displacement at initiation are considered in plane-strain, finite element computations The finite element results demonstrate a significant elevation in crack-tip constraint due to macroscopic 'sharpening' of the extending tip relative to the-blunt tip at the initiation of growth. However this effect is offset partially by the additional plastic deformation associated with the increased applied J required to grow the crack. The initial a/W ratio, tearing modulus, strain hardening exponent and specimen size interact in a complex manner to define the evolving near-tip conditions for cleavage fracture. The paper explores development of the new model, provides necessary graphs and procedures for its application and demonstrates the effects of the model on fracture data sets for two pressure vessel steels (A533B and A515). J- integral, Constraint, Scaling model, Ductile-brittle, Crack growth effects.
Book Synopsis The Fracture of Brittle Materials by : Stephen W. Freiman
Download or read book The Fracture of Brittle Materials written by Stephen W. Freiman and published by John Wiley & Sons. This book was released on 2019-01-07 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a modern, practical approach to the understanding and measurement procedures relevant to the fracture of brittle materials This book examines the testing and analysis of the fracture of brittle materials. Expanding on the measurement and analysis methodology contained in the first edition, it covers the relevant measurements (toughness and strength), material types, fracture mechanics, measurement techniques, reliability and lifetime predictions, microstructural considerations, and material/test selection processes appropriate for the analysis of the fracture behavior of brittle materials. The Fracture of Brittle Materials: Testing and Analysis, Second Edition summarizes the concepts behind the selection of a test procedure for fracture toughness and strength, and goes into detail on how the statistics of fracture can be used to assure reliability. It explains the importance of the role of microstructure in these determinations and emphasizes the use of fractographic analysis as an important tool in understanding why a part failed. The new edition includes a significant quantity of material related to the fracture of biomaterials, and features two new chapters—one on thermal shock, the other on the modeling of the fracture process. It also expands on a discussion of how to treat the statistics of fracture strength data to ensure reliability. Provides practical analysis of fracture toughness and strength Introduces the engineering and materials student to the basic concepts necessary for analyzing brittle fracture Contains new statistical analysis procedures to allow for the prediction of the safe design of brittle components Contains real-world examples to assist the reader in applying the concepts to their own research, material development, and quality-control needs The Fracture of Brittle Materials: Testing and Analysis, Second Edition is an important resource for all students, technicians, engineers, scientists, and researchers involved in the study, analysis, creation, or testing of ceramics.
Book Synopsis Strategy for characterizing fracture toughness in the ductile to brittle transition regime by : Jürgen Heerens
Download or read book Strategy for characterizing fracture toughness in the ductile to brittle transition regime written by Jürgen Heerens and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Cleavage Fracture in the Brittle to Ductile Transition Region of a Ferritic Steel by : A. Bakker
Download or read book Prediction of Cleavage Fracture in the Brittle to Ductile Transition Region of a Ferritic Steel written by A. Bakker and published by . This book was released on 1995 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model is presented to predict the event of cleavage fracture in the brittle to ductile transition region. In this region cleavage fracture could occur after some amount of ductile tearing. The model takes into account the competition between the nucleation of voids at second phase inclusions leading to ductile fracture and the nucleation of unstable micro cracks initiated at second phase inclusions leading to cleavage fracture. The model was tested on four point bend specimens of a ferritic steel tested in the brittle to ductile transition region. It was shown that there could be a significant amount of ductile crack growth before the specimens failed by cleavage. Two different crack growth simulations were performed to investigate the stresses ahead of a ductile growing crack. One simulation takes into account the softening of the material in the process zone, due to damage, around a quasistatically ductile growing crack. The second simulation neglects this damage. It was found that the crack opening stress near the crack tip in the process zone is significantly lower than in the analysis neglecting the effect of damage. Further from the crack tip, outside the damage zone the crack opening stresses are similar in both simulations.
