By D. E. McCabe, J. G. Merkle, K. Wallin
This new ASTM guide introduces the idea that of the grasp Curve procedure 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 by way of fracture mechanics info. issues conceal: • history and historic features • information validity necessities imposed on try out info, and the variety of facts required to represent a statistically useable facts set for choosing a reference temperature, To • try specimens that may be used to improve legitimate KJc • Fixturing and try apparatus wishes • training of specimens (precracking and side-grooving) for checking out • attempt machines, their mode of operation, and suggested specimen loading charges • all the details had to calculate values of KJc • Scale parameter statistical equations for cloth checking out • moment choice for calculating the To temperature that's useable whilst KJc information were generated at a number of try out temperatures • How the range of KJc values is dealt with utilizing the three-parameter Weibull version • info on ideas less than learn • short dialogue of vital issues inquisitive about without delay employing grasp Curve fracture longevity facts to the fracture-safety research of tangible 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)
35] Merkle, J. , Sokolov, M. , Nanstad, R. , and McCabe, D. , "Statistical Representation of Valid K~c Data for Irradiated RPV Steels," ORNL/NRC/LTR-01/08, Oak Ridge National Laboratory, Oak Ridge, TN, August 2002.  "Use of Fracture Toughness Test Data to Establish Reference Temperature for Pressure Retaining Materials," ASME Boiler and Pressure Vessel Code: An American National Standard, Code Case N-629, Section Xl, Division 1, American Society of Mechanical Engineers, New York, May 7, 1999.
15--Areas under a load versus applied load-line displacement plot that represent plastic work done, Ap, and stored elastic strain energy, A , at the end of a test. Crack size, a, is the starting crack length. For bend specimens, Ke = [ps/[(BB N)1/2W3/2]}f ('~)SE (B) (18) Crack size, a, is the starting crack length. The equations for f (~-~X)are given in ASTM method E 1921. 01. Linear interpolation betweerithe values given iii Table 4 is sufficiently accurate. 4~Crack Mouth Data When a crack-mouth opening displacement gage is used instead of a load-line gage, only the J p calculation is affected.
The pre-cracking recommendations of Standard E 1921 have not been stated completely herein, since the pre-cracking provisions are undergoing revisions at the present time. 5 % each side of the specimen thickness). The optimum included angle of the cutter can be 45 ~ but up to 90 ~ is considered acceptable. If the experimental plan is to use side-grooves, pre-crack the test specimens before sidegrooving. Fatigue cracks are essentially invisible at the root of the machined surface of a side-groove notch.