By D. E. McCabe, J. G. Merkle, K. Wallin
This new ASTM handbook introduces the idea that of the grasp Curve approach 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 without delay when it comes to fracture mechanics information. issues conceal: • heritage and ancient features • facts validity specifications imposed on try out info, and the variety of facts required to represent a statistically useable info set for picking a reference temperature, To • try out specimens that may be used to improve legitimate KJc • Fixturing and try out apparatus wishes • training of specimens (precracking and side-grooving) for checking out • try out machines, their mode of operation, and suggested specimen loading premiums • all the info had to calculate values of KJc • Scale parameter statistical equations for fabric trying out • moment alternative for calculating the To temperature that's useable while KJc information were generated at quite a few try temperatures • How the range of KJc values is dealt with utilizing the three-parameter Weibull version • details on ideas lower than research • short dialogue of significant concerns taken with without delay utilizing grasp Curve fracture durability info to the fracture-safety research of tangible buildings
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Additional resources for An Introduction to the Development and Use of the Master Curve Method (ASTM Manual) (Astm Manual Series, Mnl 52)
2 is the highest ranked valid Kit value. 5 / 1) TM + 20 Mpa,v/'m N (Kjc(i) - where: N = 12, F = 7j Ko(1T) K]c(m~A) = = 186 M P a ~ ' ~ , 171 MPa#rm, and = I~ To 1T X2. 2 In this data set, there are no censored data. 1 X 2 . 3 Determine K o using E q . X 1 . 4 M P a V " m . X 2 . 4 Position Master Curve: To= T - ( 0 . 019 = - 8 0 ~ X 2 . 2) Kjc(med) = 3 0 + 7 0 e x p [ 0 . 0 1 9 ( T + 80)] X 2 . 5 . 1 S e e Fig. X 2 . 1 . 600 I I I A533B AT - 75~ MASTER CURVE FOR 1T 5 0 0 -- DISTRIBUTIONS/DEVELOPED FROM Y2TCT DATA I Kj (reed) = 400 " I I / / / / " o_ 300 g v ~ 200 100 -150 I I I I I -100 -50 0 50 100 150 TEST TEMPERATURE (~ Note 1--Toughness data are converted to 1T equivalence.
16, R 183-86, 1980.  McAfee, W. , Bass, B. , and McCabe, D. , "An Investigation of Shallow-Flaw Effects on the Master Curve Indexing Parameter (To) in RPV Material," ORNL/NRC/LTR-99/28, Oak Ridge National Laboratory, Oak Ridge, TN, April 2000.  ASTM Standard E 1820-01 "Test Method for Measurement of Fracture Toughness," Annual Book of ASTM Standards, Vol. 01, ASTM International, West Conshohocken, PA, 1998.  ASTM Standard E 647, "Test Method for Measurement of Fatigue Crack Growth Rates," Annual Book of ASTM Standards, Vol.
4 M P a V " m . X 2 . 4 Position Master Curve: To= T - ( 0 . 019 = - 8 0 ~ X 2 . 2) Kjc(med) = 3 0 + 7 0 e x p [ 0 . 0 1 9 ( T + 80)] X 2 . 5 . 1 S e e Fig. X 2 . 1 . 600 I I I A533B AT - 75~ MASTER CURVE FOR 1T 5 0 0 -- DISTRIBUTIONS/DEVELOPED FROM Y2TCT DATA I Kj (reed) = 400 " I I / / / / " o_ 300 g v ~ 200 100 -150 I I I I I -100 -50 0 50 100 150 TEST TEMPERATURE (~ Note 1--Toughness data are converted to 1T equivalence. Fig. 2 X3. ~d) = 137 MPacrm; To(~0#2 = -42~ E s t i m a t e d t e m p e r a t u r e r a n g e o r u s a b l e data: = ~o(est)#2 + 5 0 ~ = -92~ < T / < +8~ N o w c o n d u c t a d d i t i o n a l testing w i t h i n this r a n g e for To d e t e r m i n a t i o n .