By D. E. McCabe, J. G. Merkle, K. Wallin
This new ASTM handbook introduces the idea that of the grasp Curve technique so it may be understood and utilized by engineers who've had restricted publicity to elastic-plastic fracture mechanics and/or complex statistical equipment. It addresses the sensible design-related challenge of defining the ductile-to-brittle fracture transition temperature of structural steels at once when it comes to fracture mechanics info. subject matters disguise: • heritage and ancient facets • information validity standards imposed on try out info, and the variety of information required to represent a statistically useable info set for making a choice on a reference temperature, To • attempt specimens that may be used to improve legitimate KJc • Fixturing and attempt apparatus wishes • practise of specimens (precracking and side-grooving) for trying out • attempt machines, their mode of operation, and advised specimen loading premiums • all the info had to calculate values of KJc • Scale parameter statistical equations for fabric checking out • moment choice for calculating the To temperature that's useable whilst KJc info were generated at a number of try temperatures • How the range of KJc values is dealt with utilizing the three-parameter Weibull version • info on suggestions less than learn • short dialogue of vital issues thinking about without delay making use of grasp Curve fracture longevity info to the fracture-safety research of exact constructions
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Additional info for An Introduction to the Development and Use of the Master Curve Method (ASTM Manual) (Astm Manual Series, Mnl 52)
Background information and an additional procedure of value for the HAZ in welds can be found in Ref. . The following evaluation procedure was applied to data from a round robin conducted by The Welding Institute (TWI). There were data from 110 specimens to work with. This initial evaluation, showing the effect of inhomogeneity on data sets, is illustrated in Fig. 18. A plot such as this is only meaningful when there is one specimen size, one test temperature, and extensive replication. If there had been multiple specimen sizes, all data could have been converted to one size using Eq 8.
01, ASTM International, West Conshohocken, PA, 1998.  ASTM Standard E 812-97, "Standard Test Method for Crack Strength of Slow-Bend Pre-Cracked Charpy Specimens of High-Strength Metallic Materials," Annual Book ASTM Standards, Vol. 01, ASTM of International, West Conshohocken, PA, 2001. , "Master Curve Analysis of Inhomogeneous Ferritic Steels," VTT Industrial System, 17~h International Conference on Offshore Mechanics and Arctic Engineering, ASME, OMAE-98-2053.  McAfee, W. , McCabe, D.
Equation 34 has been formulated using statistical theory, supported with test data [1,29]. The distribution on To is two tail, hence the standard normal deviates in Table 9 apply. It is recommended that 85 % confidence should be sufficient. Usually the compensation for uncertainty in To is a temperature adjustment made to tolerance bound curves that underlie the data. See Fig. 17. Such curves that define a lower bound of data scatter are the ones for which safe operating temperature judgments are made when design calculations are applied determinisfically.
An Introduction to the Development and Use of the Master Curve Method (ASTM Manual) (Astm Manual Series, Mnl 52) by D. E. McCabe, J. G. Merkle, K. Wallin