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Effects Of Prior Ductile Tearing On Cleavage Fracture In The Ductile To Brittle Transition Region
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Book Synopsis Effects of Prior Ductile Tearing on Cleavage Fracture in the Ductile-to-brittle Transition Region by : Ming Tang
Download or read book Effects of Prior Ductile Tearing on Cleavage Fracture in the Ductile-to-brittle Transition Region written by Ming Tang and published by . This book was released on 1994 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies demonstrate a significant effect of specimen size, a/W ratio and prior ductile tearing on cleavage fracture toughness values ($Jsb{c}$) measured in the ductile-to-brittle transition region of ferritic materials. In the lower-transition region, cleavage fracture often occurs under conditions of large-scale yielding but without prior ductile crack extension. The increased toughness develops when plastic zones formed at the crack tip interact with nearby specimen surfaces which relaxes crack-tip constraint (stress triaxiality). In the mid-to-upper transition region, small amounts of ductile crack extension (typically $
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 Numerical Modeling of Ductile Tearing Effects on Cleavage Fracture Toughness by : Robert H. Dodds
Download or read book Numerical Modeling of Ductile Tearing Effects on Cleavage Fracture Toughness written by Robert H. Dodds and published by . This book was released on 1994 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modeling of Ductile Tearing Effects on Cleavage Fracture Toughness by :
Download or read book Numerical Modeling of Ductile Tearing Effects on Cleavage Fracture Toughness written by and published by . This book was released on 1994 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies demonstrate a significant effect of specimen size, a/W ratio and prior ductile tearing on cleavage fracture toughness values (J{sub c}) measured in the ductile-to-brittle transition region of ferritic materials. In the lower-transition region, cleavage fracture often occurs under conditions of large-scale yielding but without prior ductile crack extension. The increased toughness develops when plastic zones formed at the crack tip interact with nearby specimen surfaces which relaxes crack-tip constraint (stress triaxiality). In the mid-to-upper transition region, small amounts of ductile crack extension (often
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.
Book Synopsis Fatigue and Fracture by : F. C. Campbell
Download or read book Fatigue and Fracture written by F. C. Campbell and published by ASM International. This book was released on 2012-01-01 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book emphasizes the physical and practical aspects of fatigue and fracture. It covers mechanical properties of materials, differences between ductile and brittle fractures, fracture mechanics, the basics of fatigue, structural joints, high temperature failures, wear, environmentally-induced failures, and steps in the failure analysis process."--publishers website.
Book Synopsis Application of the Local Approach to Fracture in the Brittle-to-Ductile Transition Region of Mismatched Welds by : F. Minami
Download or read book Application of the Local Approach to Fracture in the Brittle-to-Ductile Transition Region of Mismatched Welds written by F. Minami and published by . This book was released on 2002 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper predicts the cleavage resistance of steel welds in the ductile-to-brittle transition region by the Local Approach. Attention is payed to the strength mismatch effect on the ductile tearing and subsequent cleavage fracture. Welded joints of pipeline steels, X65 and X80 steels according to API 5L, are made with the same electrode under the same heat input condition. The resultant weld metals are matched for the X80 steel welds and overmatched for the X65 steel welds in terms of the yield strength. The fracture behavior is investigated with 3-point bend specimens and tension plate specimens with a notch in the weld metal close to the fusion line. The strength mismatch and specimen geometry exert a large influence on the cleavage toughness and prior ductile tearing; CTOD toughness and crack growth resistance for the X65 tension welds increased significantly. This is due to a loss of constraint induced by the strength overmatch and tension geometry. The fracture driving force is evaluated by the Weibull stress as a function of the crack growth. The computational cell model is applied for the analysis of crack growth, where the independence of the cell parameters on the strength mismatch and specimen geometry is verified. Using the Weibull stress fracture criterion coupled with the crack growth analysis, 3-point bend toughness results can be transferred to the fracture strength evaluation of tension loaded welds with strength mismatch in the ductile-to-brittle transition region.
Book Synopsis Fracture Mechanics by : Ted L. Anderson
Download or read book Fracture Mechanics written by Ted L. Anderson and published by CRC Press. This book was released on 2005-06-24 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: With its combination of practicality, readability, and rigor that is characteristic of any truly authoritative reference and text, Fracture Mechanics: Fundamentals and Applications quickly established itself as the most comprehensive guide to fracture mechanics available. It has been adopted by more than 100 universities and embraced by thousands of professional engineers worldwide. Now in its third edition, the book continues to raise the bar in both scope and coverage. It encompasses theory and applications, linear and nonlinear fracture mechanics, solid mechanics, and materials science with a unified, balanced, and in-depth approach. Reflecting the many advances made in the decade since the previous edition came about, this indispensable Third Edition now includes: A new chapter on environmental cracking Expanded coverage of weight functions New material on toughness test methods New problems at the end of the book New material on the failure assessment diagram (FAD) method Expanded and updated coverage of crack closure and variable-amplitude fatigue Updated solutions manual In addition to these enhancements, Fracture Mechanics: Fundamentals and Applications, Third Edition also includes detailed mathematical derivations in appendices at the end of applicable chapters; recent developments in laboratory testing, application to structures, and computational methods; coverage of micromechanisms of fracture; and more than 400 illustrations. This reference continues to be a necessity on the desk of anyone involved with fracture mechanics.
Book Synopsis Cleavage Fracture of Steel in the Ductile-Brittle Transition Region by : AR. Rosenfield
Download or read book Cleavage Fracture of Steel in the Ductile-Brittle Transition Region written by AR. Rosenfield and published by . This book was released on 1985 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture-toughness experiments on ASTM A508 (Unified Numbering System [UNS] K13502) steel within the ductile-brittle transition region are a combination of both ductile and brittle behaviors, leading to severe data scatter. Both crack blunting and dimpled rupture are terminated by unstable cleavage. At a lower test temperature, cleavage during blunting predominates, whereas at a higher test temperature, cleavage tends to occur after some stable crack growth. It is suggested that this behavior results from the existence of a distribution of "trigger" sites in the microstructure (for example, inclusions and carbides). Methods for eliminating the dimpled-rupture contribution to the test record are discussed and are shown to be useful for predicting large-specimen behavior.
Book Synopsis Constraint Effects in Fracture Theory and Applications by : Mark Kirk
Download or read book Constraint Effects in Fracture Theory and Applications written by Mark Kirk and published by ASTM International. This book was released on 1995 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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
Download or read book Brittle Fracture written by and published by . This book was released on 1960 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Fracture Research by : B.L. Karihaloo
Download or read book Advances in Fracture Research written by B.L. Karihaloo and published by Elsevier. This book was released on 2012-12-02 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture is a major cause of failure in metallic and non-metallic materials and structures. An understanding of the micro- and macro- mechanisms of fracture enables materials scientists to develop materials with high fracture resistance, which in turn helps engineers and designers to ensure the soundness and integrity of structures made from these materials. The International Congress on Fracture is held every four years and is an occasion to take stock of the major achievements in the broad field of fracture, to honour those who have made lasting contributions to this field, and to reflect on the future directions. ICF9 is published in six volumes covering the areas of:-- Failure Analysis, Remaining Life Assessment, Life Extension and Repair- Failure of Multiphase and Non-Metallic Materials- Fatigue of Metallic and Non-Metallic Materials and Structures- Theoretical and Computational Fracture Mechanics and New Directions- Testing and Characterization Methods, and Interfacial Fracture Mechanics- High Strain Rate Fracture and Impact Mechanics.
Book Synopsis Stochastic Micromechanical Modeling of Cleavage Fracture in the Ductile-brittle Transition Region by : David I. Auen Stienstra
Download or read book Stochastic Micromechanical Modeling of Cleavage Fracture in the Ductile-brittle Transition Region written by David I. Auen Stienstra and published by . This book was released on 1990 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ductile-brittle Transition in the Refractory Metals by : F. R. Schwartzberg
Download or read book Ductile-brittle Transition in the Refractory Metals written by F. R. Schwartzberg and published by . This book was released on 1959 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Mechanics by : John D. Landes
Download or read book Fracture Mechanics written by John D. Landes and published by ASTM International. This book was released on 1994 with total page 805 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ductile Fracture and Ductility by : Bradley Dodd
Download or read book Ductile Fracture and Ductility written by Bradley Dodd and published by Academic Press. This book was released on 1987 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
