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Author: J. Heerens Publisher: ISBN: Category : Cleavage Languages : en Pages : 15
Book Description
A method is proposed for determining a lower-bound fracture toughness value from the result of a single test in the transition region for steels. The method is based on the size criterion of Iwadate et al. for determining the number of tests needed to characterize toughness adequately at a given condition and a Weibull statistical distribution. The method was evaluated by determining a lower-bound toughness value for 68 sets of data, which include over 700 fracture toughness values in the transition. The lower-bound estimate was judged to be conservative if all of the lower-bound estimates were lower than the lowest toughness value in the set. The method was conservative for more than 60% of the data sets and for more than 95% of the individual toughness values. In addition, the method was evaluated by comparing it with 4 methods that used multiple specimens for determining a lower-bound toughness. The single-specimen method gave essentially the same lower-bound estimates as the other multiple-specimen methods.
Author: J. Heerens Publisher: ISBN: Category : Cleavage Languages : en Pages : 15
Book Description
A method is proposed for determining a lower-bound fracture toughness value from the result of a single test in the transition region for steels. The method is based on the size criterion of Iwadate et al. for determining the number of tests needed to characterize toughness adequately at a given condition and a Weibull statistical distribution. The method was evaluated by determining a lower-bound toughness value for 68 sets of data, which include over 700 fracture toughness values in the transition. The lower-bound estimate was judged to be conservative if all of the lower-bound estimates were lower than the lowest toughness value in the set. The method was conservative for more than 60% of the data sets and for more than 95% of the individual toughness values. In addition, the method was evaluated by comparing it with 4 methods that used multiple specimens for determining a lower-bound toughness. The single-specimen method gave essentially the same lower-bound estimates as the other multiple-specimen methods.
Author: JD. Landes Publisher: ISBN: Category : Fracture mechanics Languages : en Pages : 16
Book Description
A single specimen method was developed to predict the fracture toughness behavior for steels in the transition. The prediction is based on a single specimen estimate of lower bound toughness in the transition and order statistics. A fracture toughness from a single test is subjected to a lower bound estimate to generate a single lower bound value. This value is transformed into a fictitious distribution of toughness values using order statistics. From this a median value of toughness, KJc(med), is determined and hence To where To is the temperature at which the master curve reaches a median toughness of 100 MPa?m. With the determination of To the entire distribution of toughness in the transition is determined.
Author: J. P. Gudas Publisher: ASTM International ISBN: 0803112998 Category : Fracture mechanics Languages : en Pages : 615
Book Description
Papers from the 21st National Symposium on Fracture Mechanics, held in Annapolis, Md., June 1988, present new work in elastic-plastic fracture, dynamic fracture, transition fracture in steels, micromechanical aspects of the fracture process, computational mechanics, fracture mechanics testing, and a
Author: Hans-Jakob Schindler Publisher: ISBN: Category : Brittle-to ductile transition Languages : en Pages : 16
Book Description
The master-curve (MC) enables fracture toughness to be measured in the ductile-to-brittle temperature (DBT) regime of ferritic steels using small specimens. However, MC application to structural components remains unclear in some areas. Vital issues of regulatory concern are the differences in the reference temperature T0 obtained from specimens of different sizes and shapes, the extension of the MC into the upper transition range, and the acceptability, or not, of a given level of failure probability to be used in the analysis of safety-relevant components [e.g., nuclear power reactor pressure vessel (RPV)]. Based on general theoretical considerations, the existence of a deterministic temperature-dependent lower bound of KIc or KJc is postulated. It can serve to provide conservative fracture toughness values as required in a screening analysis, which is usually the first step of a fracture mechanics analysis of a structural component. A simple method to determine this lower bound from the reference temperature T0 is presented. Furthermore, since testing of small specimens, like in precracked Charpy (PCC) tests, often leads to E1921-invalid data, an alternative procedure to estimate the MC is suggested that can use the invalid data. The practicability of the method is shown by a few examples. Based on the same method, a lower-bound of dynamic fracture toughness can be estimated from Charpy data sets. Combined with an empirical temperature shift, the lower bound of static fracture toughness can be estimated as well.
Author: E. M. Hackett Publisher: ASTM International ISBN: 0803114818 Category : Continuum mechanics Languages : en Pages : 514
Book Description
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
Author: J. Heerens
Author: J. Heerens
Author: JD. Landes
Author: John D. Landes
Author: 
Author: John H. Underwood
Author: J. P. Gudas
Author: Hans-Jakob Schindler
Author: 
Author: Thomas A. Cruse
Author: E. M. Hackett