An Introduction to the Development and Use of the Master by D. E. McCabe, J. G. Merkle, K. Wallin

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)

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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. [36] "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.

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