By D. E. McCabe, J. G. Merkle, K. Wallin
This new ASTM handbook introduces the concept 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 complicated 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 facts. issues conceal: • history and historic features • info validity requisites imposed on try information, and the variety of information required to represent a statistically useable facts set for picking out a reference temperature, To • try out specimens that may be used to increase 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 charges • the entire info had to calculate values of KJc • Scale parameter statistical equations for fabric trying out • moment choice for calculating the To temperature that's useable while KJc information were generated at quite a few try out temperatures • How the variety of KJc values is dealt with utilizing the three-parameter Weibull version • details on recommendations lower than research • short dialogue of vital concerns concerned about without delay utilising grasp Curve fracture longevity information to the fracture-safety research of exact constructions
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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)
0 100 200 300 400 Kac = [MPa~/m] 500 600 Fig. 18--The Welding Institute round robin fracture toughness data . Including the inhomogeneity makes standard MC analysis non-conservative (267 MPa r versus 215 MPa ~/m). for the complete data set (the broken line in Fig. 18) were noticeably different. Furthermore, the plot of the complete data set did not follow a nearly straight line up to M ~ 30. Therefore, a data treatment procedure was warranted. Note 4--SINTAP Structural Integrity Assessment Procedure for treatment of Fracture Toughness Data .
The rules applied to the input into Eq 26 are as follows: 1. 2. 3. 4. 8i is the Kronecker delta. Its use is defined in the Nomenclature. 2, then Kjc(i) is invalid, and Kjc0imit), converted to 1T equivalence, is an eligible replacement d u m m y value. All Kjc(i) data, valid and invalid d u m m y values, are adjusted to IT size equivalence. Use Eq 8 to convert Kjc data of another size to 1T equivalence. org 5. 6. 7. 8. 9. 10. 3 exceeds 1 m m , the Kj value at t h e p o i n t of 1 m m ductile c r a c k - g r o w t h r e p l a c e s the invalid Kjc(i ) d a t u m .
5. No invalid Kj~ data have been discarded. ) equivalent thickness. 2inValid Plus Invalid Data at One Test Temperature The following equation was derived by m a x i m u m likelihood theory to use with mixed valid and invalid Kj~ data . It is assumed here that: 1. All specimens have been tested at one test temperature. 2. All specimens are of ASTM E 1921 specified geometries. 3. If specimens were of varied sizes, the Kjc values have been converted to one c o m m o n size. See Note 3. 4. There are at least six valid Kjc values in the mix of valid/invalid data.
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