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A Model For Predicting Fracture Toughness Of Steels In The Transition Region From Hardness
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Book Synopsis A Model for Predicting Fracture Toughness of Steels in the Transition Region from Hardness by : M. Wagenhofer
Download or read book A Model for Predicting Fracture Toughness of Steels in the Transition Region from Hardness written by M. Wagenhofer and published by . This book was released on 2003 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the nature of fracture in the lower transition region where final fracture by cleavage is preceded by some amount of plastic deformation, it is appropriate to use a combined strength-strain criterion to describe the conditions at fracture. A dislocation- based model for predicting fracture toughness of steels in the transition region has been developed where the primary feature describing the temperature dependence of fracture toughness is a plastic work term of the following form: ?eff=(?m? ̄)f??ZAd?p ̄.D0 where ?eff is the effective plastic work to fracture, d?p is the effective plastic strain increment, ?m/ ̄? is the triaxiality ratio and r0 is the length scale of the critical fracture event typically taken as carbide cracking*(and thus D0 = r0 is the critical carbide radius). The ?ZA term represents the flow stress from the Zerilli-Armstrong constitutive equation for bcc metals. This term introduces a temperature dependency based on dislocation mechanics considerations. Inserting the first equation into the Griffith-Orowan equation for fracture stress leads to the elimination of the carbide radius from the equation, ?f=[?E?eff2(1-?2)r0]1/2 and thus the need for defining a characteristic distance.
Book Synopsis A Physics-Based Predictive Model for Fracture Toughness Behavior by : M. Wagenhofer
Download or read book A Physics-Based Predictive Model for Fracture Toughness Behavior written by M. Wagenhofer and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using the Zerilli-Armstrong (ZA) constitutive model for BCC materials and a combined strength-strain model of fracture, a physics model suitable for predicting the fracture toughness transition behavior of ferritic steels has been developed. The model predicts an exponential dependence of the plastic work on temperature and thus is comparable to the exponential dependence of plastic work predicted by Wallin et al. for the Master Curve. Exploring the limits of applicability of the ZA equation used as the basis for this model provides the information required to firmly establish the limits of material condition applicability of the Master Curve. Calculations based on limited data provide validation of the proposed model. The models ability to predict shifts in transition temperature with irradiation and its application to RP vessel integrity assessment will also be discussed.
Book Synopsis Transition Toughness Modeling of Steels Since RKR by : M. Wagenhofer
Download or read book Transition Toughness Modeling of Steels Since RKR written by M. Wagenhofer and published by . This book was released on 2004 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper we trace the development of transition fracture toughness models from the landmark paper of Ritchie, Knott, and Rice in 1973 up through the current day. While such models have become considerably more sophisticated since 1973, none have achieved the goal of blindly predicting fracture toughness data. In this paper we suggest one possible way to obtain such a predictive model.
Book Synopsis Fracture Toughness Predictions for Modern Low-carbon, High-strength Steels Based on Microstructural and Micromechanistic Approaches by :
Download or read book Fracture Toughness Predictions for Modern Low-carbon, High-strength Steels Based on Microstructural and Micromechanistic Approaches written by and published by . This book was released on 2002 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue and Fracture Mechanics by : Walter G. Reuter
Download or read book Fatigue and Fracture Mechanics written by Walter G. Reuter and published by ASTM International. This book was released on 2002-12-31 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the whole of Asia and the Pacific region, this text provides both an analytic overview and specific data for each of the 60 countries. Introductory chapters cover regional issues, including: a regional review with the year's trends, developments and key events' analysis of the threat of terrorism in the region; the effects of deflation on the economy; the water crisis and its impact on the poor; and the successes and failures of micro-credit in the region.
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 Micromechanical Prediction of Fracture Toughness for Pressure Vessel Steel Using a Coupled Model by : MR. Goldthorpe
Download or read book Micromechanical Prediction of Fracture Toughness for Pressure Vessel Steel Using a Coupled Model written by MR. Goldthorpe and published by . This book was released on 1999 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Toughness Testing and Its Applications by :
Download or read book Fracture Toughness Testing and Its Applications written by and published by ASTM International. This book was released on 1965 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Variation in Fracture Toughness K Sub Ic from Small Specimen Tests by : Alan S. Tetelman
Download or read book Prediction of Variation in Fracture Toughness K Sub Ic from Small Specimen Tests written by Alan S. Tetelman and published by . This book was released on 1970 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Charpy transition temperature and low temperature fracture toughness of low alloy steels depend on three parameters; the microcleavage strength, the yield strength, and the critical crack tip radius. Microcleavage strength and critical crack tip radius appear to be essentially independent of temperature in low alloy steels. A method was developed for relating the change in transition temperature to the change in Charpy transition temperature, since both of these macroscopic measures of toughness depend on the same microscopic parameters. The method for making these calculations and predictions is described. (Author).
Book Synopsis Properties Related to Fracture Toughness by :
Download or read book Properties Related to Fracture Toughness written by and published by ASTM International. This book was released on 1976 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue and Fracture Mechanics written by and published by . This book was released on 2001 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Prediction of Cleavage Fracture Probability for Ferritic Steels in the Transition Region by : V. Bicego
Download or read book Prediction of Cleavage Fracture Probability for Ferritic Steels in the Transition Region written by V. Bicego and published by . This book was released on 1995 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is described for modelling the stochastic variability of toughness data for ferritic steels in the brittle to ductile transition regime. The present model is based on two ingredients: a weakest link approach using Weibull statistics with a suitable modification to include the effect of ductile tearing, and an accurate expression of the material J-R curve, determined from fractography. The model provides a rationale for the different fracture behaviour of a material over the whole range of temperature, from fully stable J-R behaviour at high temperature down to brittle fracture under LEFM conditions at low temperature.
Book Synopsis Fracture Toughness of Ferritic Steels in the Ductile-to-Brittle Transition Region by : Carlos Berejnoi
Download or read book Fracture Toughness of Ferritic Steels in the Ductile-to-Brittle Transition Region written by Carlos Berejnoi and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferritic steels, as other materials, have different failure modes depending on the temperature. At elevated temperatures, they behave as ductile materials, while at low temperatures they are brittle. There is an intermediate temperature region where these alloys have a failure mode resulting from the competition between cleavage and ductile mechanisms. This region is known as the ductile-to-brittle transition zone. The characterization of fracture resistance of ferritic steels in the ductile-to-brittle transition region is problematic due to scatter in results, as well as size and temperature dependences. American Society for Testing and Materials (ASTM) has standardized the determination of a temperature reference (T0) for the fracture toughness characterization of ferritic steels in this region. This chapter presents the evolution of the statistical treatment of fracture toughness data until the present, including some comments on T0 determination, and some aspects that require a deeper analysis.
Book Synopsis Degradation of Fracture Toughness in Steels Due to Prior Strain by : Gregory Benson Sanford
Download or read book Degradation of Fracture Toughness in Steels Due to Prior Strain written by Gregory Benson Sanford and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis quantifies the relationship between prior plastic strain, fracture toughness (J sub Ic), plane strain fracture strain (epsilon sub fps), and yield strength (Q sub y) of HY-series steels at room temperature. Based upon initial J-integral test results of compact tensile specimens that showed a reduction in the fracture toughness with increasing of prestrain, a correlation has been developed where JIc is directly proportional to epsilon sub fps to the fourth power. Thus, small changes in epsilon sub fps will cause large changes in JIc. Further, it has been found that prestrain reduces epsilon sub fps by an amount equal to the prestrain. The combination of these two correlations provides a very simple method of estimating the fracture toughness subsequent to plastic straining. Scanning electron microscopy was used to measure the crack tip stretch zone width (SZW), which is a good estimate of the crack tip strain prior to fracture. The SZW does decrease with increasing prior plastic strain verifying the decrease in epsilon sub fps.
Book Synopsis Statistical Characterization of Fracture in the Transition Region by : JD. Landes
Download or read book Statistical Characterization of Fracture in the Transition Region written by JD. Landes and published by . This book was released on 1980 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture toughness results are measured in the transition region for an ASTM A471 Ni-Cr-Mo-V steel on two specimen sizes 1T compact tension (CT) and 4T-CT. The results are typical for steels in the transition in that the smaller specimen toughness values are greater than the larger specimen results. Two explanations are given for this behavior. One explanation, based on loss of constraint, suggests that small specimens cannot be used to characterize the toughness of a large structure in the transition region. A second explanation, based on a statistical model, suggests that small specimen results when properly analyzed can be used to characterize the toughness of large structures.
